Solid-State Relays
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2006–2009 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
PA G E
1
DATA SHEET
Form 0859-090819
Solid-State Relays
Opto 22 Power
Series SSR
Features
Rugged, epoxy encapsulation construction
4,000 volts of optical isolation
Subjected to full load test and six times the rated
current surge before and after encapsulation
Unique heat-spreader technology
UL and CSA recognized
Overview
In 1974, Opto 22 introduced the first liquid epoxy-filled line of
power solid-state relays (SSR). This innovation in SSR design greatly
improved the reliability and reduced the cost of manufacturing. At
that time, we also incorporated into our manufacturing process
100% testing under full load conditions of every relay we produced.
By 1978, Opto 22 had gained such a reputation for reliability that
we were recognized as the world’s leading manufacturer of solid-
state relays. Through continuous manufacturing improvements and
the same 100% testing policy established over 30 years ago,
Opto 22 is still recognized today for the very high quality and
reliability of all our solid-state relays.
Description
Opto 22 offers a complete line of SSRs, from the rugged 120/240/
380-volt AC Series to the small footprint MP Series, designed for
mounting on printed circuit boards. All Opto 22 SSRs feature 4,000
volts of optical isolation and are UL and CSA recognized. The
innovative use of room-temperature liquid epoxy encapsulation,
coupled with Opto 22’s unique heat-spreader technology, are key to
mass producing the world’s most reliable solid state relays.
Every Opto 22 solid state relay is subjected to full load test and six
times the rated current surge both before and after encapsulation.
This double testing of every part before it leaves the factory means
you can rely on Opto 22 solid state relays. All Opto 22 SSRs are
guaranteed for life.
Part Numbers
Part Description
120A10 120 VAC, 10 Amp, AC Control
120A25 120 VAC, 25 Amp, AC Control
240A10 240 VAC, 10 Amp, AC Control
240A25 240 VAC, 25 Amp, AC Control
240A45 240 VAC, 45 Amp, AC Control
120D3 120 VAC, 3 Amp, DC Control
120D10 120 VAC, 10 Amp, DC Control
120D25 120 VAC, 25 Amp, DC Control
120D45 120 VAC, 45 Amp, DC Control
240D3 240 VAC, 3 Amp, DC Control
240D10 240 VAC, 10 Amp, DC Control
240Di10 240 VAC, 10 Amp, DC Control, with LED Indicators
240D25 240 VAC, 25 Amp, DC Control
240Di25 240 VAC, 25 Amp, DC Control, with LED Indicators
240D45 240 VAC, 45 Amp, DC Control
240Di45 240 VAC, 45 Amp, DC Control, with LED Indicators
380D25 380 VAC, 25 Amp, DC Control
380D45 380 VAC, 45 Amp, DC Control
Part Description
480D10-12 480 VAC, 10 Amp, DC Control, Transient Proof
480D15-12 480 VAC, 15 Amp, DC Control, Transient Proof
480D25-12 480 VAC, 25 Amp, DC Control, Transient Proof
480D45-12 480 VAC, 45 Amp, DC Control, Transient Proof
575D15-12 575 VAC, 15 Amp, DC Control, Transient Proof
575D45-12 575 VAC, 45 Amp, DC Control, Transient Proof
575Di45-12 575 VAC, 45 Amp, DC Control, Transient Proof,
with LED Indicators
Z120D10 Z Model, 120 VAC, 10 Amp, DC Control
Z240D10 Z Model, 240 VAC, 10 Amp, DC Control
MP120D2
or P120D2
120 VAC, 2 Amp, DC Control.
P model is low profile.
MP120D4
or P120D4
120 VAC, 4 Amp, DC Control.
P model is low profile.
MP240D2
or P240D2
240 VAC, 2 Amp, DC.
P model is low profile.
MP240D4
or P240D4
240 VAC, 4 Amp, DC.
P model is low profile.
MP380D4 380 VAC, 4 Amp, DC
Solid-State Relays
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2006–2009 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Solid-State Relays
PA G E
2
DATA SHEET
Form 0859-090819
Power Series SSRs
Opto 22 provides a full range of Power
Series relays with a wide variety of
voltage (120–575 volts) and current
options (3–45 amps). All Power Series
relays feature 4,000 volts of optical
isolation and have a high PRV rating.
Some Power Series relays include
built-in LEDs to indicate operation.
DC Series
The DC Series delivers isolated DC control to large OEM customers
worldwide.
AC Series
The AC Series offers the ultimate in solid state reliability. All AC
Power Series relays feature a built-in snubber and zero voltage turn
on. Transient-proof models offer self protection for noisy electrical
environments.
Z Series SSRs
The Z Series employs a unique heat
transfer system that makes it possible
for Opto 22 to deliver a low-cost, 10-
amp, solid state relay in an all-plastic
case. The push-on, tool-free quick-
connect terminals make the Z Series
ideal for high-volume OEM
applications. Operating temperature: –40 °C to 100 °C.
Printed Circuit Series SSRs
Opto 22’s Printed Circuit Series allows
OEMs to easily deploy solid state
relays on printed circuit boards. Two
unique packages are available, both
of which will switch loads up to four
amps. Operating temperature: –40 °C
to 100 °C.
MP Series
The MP Series packaging is designed with a minimum footprint to
allow maximum relay density on the printed circuit board.
P Series
The P Series power relays provide low-profile [0.5 in. (12.7 mm)]
center mounting on printed circuit boards.
Specifications
(all Power Series models)
• 4,000 V optical isolation, input to output
• Zero voltage turn-on
• Turn-on time: 0.5 cycle maximum
• Turn-off time: 0.5 cycle maximum
• Operating temperature: –40 °C to 100 °C
• Operating frequency: 25 to 65 Hz
(operates at 400 Hz with six times off-state leakage)
• Coupling capacitance, input to output: 8 pF maximum
• Hermetically sealed
• DV/DT Off-state: 200 volts per microsecond
• DV/DT commutating: snubbed for rated current at
0.5 power factor
• UL recognized
• CSA certified
•CE component
• Torque specs for screws: Control terminals, 6 in/lb
Field terminals, 18 in/lb
Safety Cover for Power Series SSRs
A plastic safety cover (Opto 22 part number SAFETY COVER) is
optionally available for Opto 22 Power Series SSRs. The safety cover
reduces the chance of accidental contact with relay terminals, while
providing access holes for test instrumentation.
An optional plastic safety cover can be installed on a Power Series SSR.
Solid-State Relays
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2006–2009 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Solid-State Relays DATA SHEET
Form 0859-090819
PA G E
3
AC Power Series Specifications
Opto 22 provides a full range of Power Series relays with a wide variety of voltage (120–575) and current options (3–45 amps). All Power
Series relays feature 4,000 volts of optical isolation and have a high PRV rating. Operating temperature is –40 °C to 100 °C.
120/240/380 Volt
Model
Number
Nominal
AC Line
Volt a g e
Nominal
Current
Rating
(Amps)
1 cycle
Surge
(Amps)
Peak
Nominal
Signal Input
Resistance
(Ohms)
Signal
Pick-up
Voltag e
Signal
Drop-out
Voltag e
Peak
Repetitive
Volt a g e
Maximum
Maximum
Output
Volt a ge
Drop
Off-State
Leakage
(mA)
Maximum**
Operating
Volta g e
Range
(Volts AC)
I
2
t
Rating
t=8.3
(ms)
Isolation
Volt age
θ
jc*
(°C/Watt)
Dissipation
(Watts/
Amp)
120D3
120 3 85 1000 3VDC
(32V allowed)
1 VDC 600 1.6 volts 2.5mA 12–140 30 4,000V
RMS
11 1.7
120D10
120 10 110 1000 3VDC
(32V allowed)
1 VDC 600 1.6 volts 7 mA 12–140 50 4,000V
RMS
1.3 1.6
120D25
120 25 250 1000 3VDC
(32V allowed)
1 VDC 600 1.6 volts 7 mA 12–140 250 4,000V
RMS
1.2 1.3
120D45
120 45 650 1000 3VDC
(32V allowed)
1 VDC 600 1.6 volts 7 mA 12–140 1750 4,000V
RMS
0.67 0.9
240D3
240 3 85 1000 3VDC
(32V allowed)
1 VDC 600 1.6 volts 5 mA 24–280 30 4,000V
RMS
11 1.7
240D10
240 10 110 1000 3VDC
(32V allowed)
1 VDC 600 1.6 volts 14 mA 24–280 50 4,000V
RMS
1.3 1.6
240Di10
240 10 110 730 3VDC
(32V allowed)
1 VDC 600 1.6 volts 14 mA 24–280 50 4,000V
RMS
1.3 1.6
240D25
240 25 250 1000 3VDC
(32V allowed)
1 VDC 600 1.6 volts 14 mA 24–280 250 4,000V
RMS
1.2 1.3
240Di25
240 25 250 730 3VDC
(32V allowed)
1 VDC 600 1.6 volts 14 mA 12–280 250 4,000V
RMS
1.2 1.3
240D45
240 45 650 1000 3VDC
(32V allowed)
1 VDC 600 1.6 volts 14 mA 24–280 1750 4,000V
RMS
0.67 0.9
240Di45
240 45 650 730 3VDC
(32V allowed)
1 VDC 600 1.6 volts 14 mA 24–280 1750 4,000V
RMS
0.67 0.9
380D25
380 25 250 1000 3VDC
(32V allowed)
1 VDC 800 1.6 volts 12 mA 24–420 250 4,000V
RMS
1.2 1.3
380D45
380 45 650 1000 3VDC
(32V allowed)
1 VDC 800 1.6 volts 12 mA 24–420 1750 4,000V
RMS
0.67 0.9
120A10
120 10 110 33K 85VAC
(280V allowed)
10 VAC 600 1.6 volts 7 mA 12–140 50 4,000V
RMS
1.3 1.6
120A25
120 25 250 33K 85VAC
(280V allowed)
10 VAC 600 1.6 volts 7 mA 12–140 250 4,000V
RMS
1.2 1.3
240A10
240 10 110 33K 85VAC
(280V allowed)
10 VAC 600 1.6 volts 14 mA 24–280 50 4,000V
RMS
1.3 1.6
240A25
240 25 250 33K 85VAC
(280V allowed)
10 VAC 600 1.6 volts 14 mA 24–280 250 4,000V
RMS
1.2 1.3
240A45
240 45 650 33K 85VAC
(280V allowed)
10 VAC 600 1.6 volts 14 mA 24–280 1750 4,000V
RMS
0.67 0.9
Note:
θ
jc* = Thermal resistance junction to base. Maximum junction temperature is 110 °C.
** Operating Frequency: 25 to 65 Hz (operates at 400 Hz with 6 times the offstate leakage)
Solid-State Relays
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2006–2009 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Solid-State Relays
PA G E
4
DATA SHEET
Form 0859-090819
120/240/380 Volt (cont.)
Surge Current Data
Thermal Ratings
Dimensional Drawings
Time
(Seconds)
Time*
(Cycles)
3-Amp
Peak
Amps
10-Amp
Peak
Amps
25-Amp
Peak
Amps
45-Amp
Peak
Amps
0.017 1 85 110 250 650
0.050 3 66 85 175 420
0.100 6 53 70 140 320
0.200 12 45 60 112 245
0.500 30 37 50 80 175
1 60 31 40 67 134
2 120 28 33 53 119
3 180 27 32 49 98
4 240 26 31 47 95
5 300 25 30 45 91
10 600 24 28 42 84
Note: *60 HZ.
Side view: Part numbers DC60S3, 120D3,
and 240D3 only
Side view: All other part numbers
Solid-State Relays
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2006–2009 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Solid-State Relays DATA SHEET
Form 0859-090819
PA G E
5
480/575 Volt
Surge Current Data Thermal Ratings
Model
Number
Nominal
AC Line
Voltag e
Nominal
Current
Rating
(Amps)
1 cycle
Surge
(Amps)
Peak
Nominal
Signal Input
Resistance
(Ohms)
Signal
Pick-up
Voltag e
Signal
Drop-out
Volt a g e
Peak
Repetitive
Voltag e
Maximum
Maximum
Output
Volt a ge
Drop
Off-State
Leakage
(mA)
Maximum**
Operating
Vol t age
Range
(Volts AC)
I
2
t
Rating
t=8.3
(ms)
Isolation
Volta g e
θ
jc*
(°C/Watt)
Dissipation
(Watts/Amp)
480D10-12
480 10 110 1000 3VDC
(32V allowed)
1 VDC 1200 3.2 volts 11 mA 100–530 50 4,000V
RMS
1.2 2.5
480D15-12
480 15 150 1000 3VDC
(32V allowed)
1 VDC 1200 3.2 volts 11 mA 100–530 50 4,000V
RMS
1.2 2.5
480D25-12
480 25 250 1000 3VDC
(32V allowed)
1 VDC 1000 1.6 volts 11 mA 100–530 250 4,000V
RMS
1.3 1.3
480D45-12
480 45 650 1000 3VDC
(32V allowed)
1 VDC 1000 1.6 volts 11 mA 100–530 1750 4,000V
RMS
0.67 0.9
575D15-12
575 15 150 1000 3VDC
(32V allowed)
1 VDC 1200 3.2 volts 15 mA 100–600 90 4,000V
RMS
1.2 2.5
575D45-12
575 45 650 1000 3VDC
(32V allowed)
1 VDC 1000 1.6 volts 15 mA 100–600 1750 4,000V
RMS
0.67 0.9
575Di45-12
575 45 650 730 3VDC
(32V allowed)
1 VDC 1000 1.6 volts 15 mA 100–600 1750 4,000V
RMS
0.67 0.9
Note:
θ
jc* = Thermal resistance junction to base. Maximum junction temperature is 110 °C.
** Operating Frequency: 25 to 65 Hz (operates at 400 Hz with 6 times the offstate leakage)
Time
Second
Time***
(Cycles)
10-Amp
Peak
Amps
15-Amp
Peak
Amps
25-Amp
Peak
Amps
45-Amp
Peak
Amps
0.017 1 110 150 250 650
0.050 3 85 140 175 420
0.100 6 70 110 140 320
0.200 12 60 90 112 245
0.500 30 50 70 80 175
1 60 40 55 67 134
2 120 33 49 53 119
3 180 32 47 49 98
4 240 31 43 47 95
5 300 30 40 45 91
10 600 28 35 42 84
Note: ***60 HZ
Solid-State Relays
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2006–2009 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Solid-State Relays
PA G E
6
DATA SHEET
Form 0859-090819
480/575 Volt (cont)
Dimensional Drawings
Z Series Specifications
AC Power: 120/240 Volt
The Z Series employs a unique heat transfer system that makes it possible for Opto 22 to deliver a low-cost, 10-amp, solid-state relay in an all-
plastic case. The push-on tool-free quick-connect terminals make the Z Series ideal for high-volume OEM applications. Operating
temperature is –40 °C to 100 °C.
Side view: Part numbers DC60S3, 120D3,
and 240D3 only
Side view: All other part numbers
Model
Number Nominal
AC Line
Voltage
Nominal
Current
Rating
(Amps)
1 cycle
Surge
(Amps)
Peak
Nominal
Signal
Input
Resistance
(Ohms)
Signal
Pick-up
Voltage
Signal
Drop-out
Voltage
Peak
Repetitive
Voltage
Maximum
Maximum
Output
Voltage
Drop
Off-State
Leakage
(mA)
Maximum
**
Operating
Voltage
Range
(Volts AC )
I2t
Rating
t=8.3
(ms)
Isolation
Voltage θjc*
(°C/Watt) Dissipation
(Watts/Amp)
Z120D10 120 10 110 1000 3VDC
(32V
allowed) 1 VDC 600 1.6 volts 6 mA 12-140 50 4,000
VRMS 41
Z240D10 240 10 110 1000 3VDC
(32V
allowed) 1 VDC 600 1.6 volts 12 mA 24-280 50 4,000
VRMS 41
Notes: θjc* = Thermal resistance junction to base. Maximum junction temperature is 110°C.
** Operating Frequency: 25 to 65 Hz (operates at 400 Hz w ith 6 times the offstate leakage)
Solid-State Relays
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2006–2009 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Solid-State Relays DATA SHEET
Form 0859-090819
PA G E
7
AC Power: 120/240 Volt (cont.)
Dimensional Drawings
Current vs. Ambient Ratings Surge Current Data
Solid-State Relays
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2006–2009 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Solid-State Relays
PA G E
8
DATA SHEET
Form 0859-090819
Printed Circuit Series Specifications
AC Power: MP and P Series
The MP Series packaging is designed with a minimum footprint to allow maximum relay density on the printed circuit board. The P Series
power relays provide low-profile for 0.5-inch (12.7 mm) center mounting on printed circuit boards. Operating temperature: –40 °C to 100 °C.
A C P ow er: P and MP Series
MP120D2
or P120D2 MP120D4
or P120D4 MP240D2
or P240D2 MP240D4
or P240D4 MP380D4
Nominal AC Line Voltage 120 120 240 240 380
Nominal Current Rating Amps 2 4 2 4 4
1 cycle Surge (Amps) Peak 20 85 20 85 85
Nominal Signal Input
Resistance (Ohms) 1000 1000 1000 1000 1000
Signal Pick-up Voltage 3VDC***
(24V allowed) 3VDC***
(24V allowed) 3VDC***
(24V allowed) 3VDC***
(24V allowed) 3VDC***
(24V allowed)
Signal Drop-out Voltage 1 VDC 1 VDC 1 VDC 1 VDC 1 VDC
Peak Repetitive Voltage Maximum 600 600 600 600 800
Maximum Output Voltage Drop 1.6 volts 1.6 volts 1.6 volts 1.6 volts 1.6 volts
Off-State Leakage mA Maximum** 5 mA 5 mA 5 mA 5 mA 5 mA
Operating Voltage Range (Volts AC) 12–140 12–140 24–280 24–280 24–420
I
2
t Rating t=8.3 (ms) 2 30 2 30 30
Isolation Voltage 4,000 V
RMS
4,000 V
RMS
4,000 V
RMS
4,000 V
RMS
4,000 V
RMS
θ
jc* °C/Watt 20 6.5 20 6.5 6.5
Dissipation Watts/Amp 1.2 1.2 1.2 1.2 1.2
Rating (Motor Load) 1 FLA at 120 VAC
6 LRA at 120 VAC 2.5 FLA at 240 VAC
6 LRA at 240 VAC 1 FLA at 120 VAC
15 LRA at 120 VAC 2.5 FLA at 240 VAC
15 LRA at 240 VAC 2.5 FLA at 380 VAC
15 LRA at 380 VAC
Notes:
θ
jc* = Thermal resistance junction to base. Maximum junction temperature is 110 °C.
** Operating Frequency: 25 to 65 Hz (operates at 400 Hz with 6 times the offstate leakage)
*** = P Series 32 volts maximum.
Solid-State Relays
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2006–2009 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Solid-State Relays DATA SHEET
Form 0859-090819
PA G E
9
AC Power: P and MP Series (cont.)
Surge Current Data Dimensional Drawings
Time
Second
Time*
(Cycles)
Peak
Amps
Peak
Amps
0.017 1 20 85
0.050 3 18 66
0.100 6 15 53
0.200 12 11 45
0.500 30 9 37
1608.531
2 120 8 28
3 180 7.5 27
42407 26
5 300 6.5 25
10 600 6 24
Note: *60 HZ
Solid-State Relays
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2006–2009 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Solid-State Relays
PA G E
10
DATA SHEET
Form 0859-090819
AC Power: P and MP Series (cont.)
Thermal Ratings
Surge Current Data
Time
Second
Time*
(Cycles)
Peak
Amps
Peak
Amps
0.017 1 20 85
0.050 3 18 66
0.100 6 15 53
0.200 12 11 45
0.500 30 9 37
1608.531
21208 28
31807.527
4 240 7 26
5 300 6.5 25
10 600 6 24
Note: *60 HZ
Solid-State Relays
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2006–2009 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Solid-State Relays DATA SHEET
Form 0859-090819
PA G E
11
DC Switching Series Specifications Thermal Ratings
DC60P or
DC60MP
DC200P or
DC200MP DC60S-3 DC60S-5
Operating Voltage
Range 5-60 VDC 5-200 VDC 5-60 VDC 5-60 VDC
Forward Voltage
Drop
1.5 volts 1.5 volts
at 1 amp
1.5 volts
at 3 amps
1.5 volts
at 5 amps
Nominal Current
Rating 3 amps 1 amp 3 amps 5 amps
Off-State Blocking 60 VDC 250 VDC 60 VDC 60 VDC
Signal Pickup
Voltage
3 VDC
32 Volts*
allowed
3 VDC
32 Volts*
allowed
3 VDC
32 Volts
allowed
3 VDC
32 Volts
allowed
Signal Dropout
Voltage 1 VDC 1 VDC 1 VDC 1 VDC
Signal Input
Impedance 1,000 ohms 1,000
ohms 1,000 ohms 1,000 ohms
1 Second Surge 5 amps 2 amps 5 amps 10 amps
Operating Temp.
Range
-40° C to
100° C
-40° C to
100° C
-40° C to
100° C
-40° C to
100° C
Isolation Voltage 4,000 VRMS 4,000 VRMS 4,000 VRMS 4,000 VRMS
Off-state Leakage 1 mA
maximum
1 mA
maximum
1 mA
maximum
1 mA
maximum
Package Type P/MP
series
P/MP
series
Power
series
Power
series
Turn-On Time 100 μsec 100 μsec 100 μsec 100 μsec
Turn-Off Time 750 μsec 750 μsec 750 μsec 750 μsec
Note: *MP series maximum allowed control signal 24 VDC.
Solid-State Relays
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2006–2009 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Solid-State Relays
PA G E
12
DATA SHEET
Form 0859-090819
Dimensional Drawings
Side view: Part numbers DC60S3,
120D3, and 240D3 only
Side view: All other part numbers
Solid-State Relays
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2006–2009 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Solid-State Relays DATA SHEET
Form 0859-090819
PA G E
13
Applications: Tips
Heat Sink Calculation
Like all semiconductor devices, SSR current ratings must be based on
maximum junction temperature. All Opto 22 SSRs operate conservatively
at maximum junction temperatures of 110 °C. Determining an adequate
heat sink for a given SSR conducting a given current is very simple.
IMPORTANT: Thermally conductive grease must be used
between the relay base and the heat sink.
Sample Calculation 1
120-volt, 20-amp load; 50 °C ambient air temperature
Model: 120D25 SSR.
See the last two columns of the table on page 3 for dissipation and thermal resistance values for the 120D25. Also, see the note at the bottom
of the table.
Dissipation: 1.3 watts/amp
Thermal resistance: 1.2 °C/watt
Maximum junction temperature: 110 °C
The calculation would be as follows:
This means that you should select a heat sink with a thermal resistance of less than 1.1 °C/watt.
Heat dissipation: 20 amps x 1.3 watts/amp = 26.0 watts
Temperature rise, junction to SSR base: 26.0 watts x 1.2 °C/watt = 31.2 °C
Allowable temperature of heat sink: 110 C - 31.2 C = 78.8 °C
Allowable temperature rise on heat sink: 78.8 C - 50 C = 28.8 °C
Heat sink thermal resistance limit: (28.8 C)/(26.0 W) = 1.1 °C/watt
Solid-State Relays
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2006–2009 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Solid-State Relays
PA G E
14
DATA SHEET
Form 0859-090819
Sample Calculation 2
240-volt,18-amp load, 25 °C ambient air temperature
Model: 240D45
See the last two columns of the table on page 3 for dissipation and thermal resistance values for the 240D45. Also, see the note at the bottom
of the table.
Dissipation: 0.9 watts/amp
Thermal resistance: 0.67 °C/watt
Maximum junction temperature: 110 °C
The calculation would be as follows:
This means that you should select a heat sink with a thermal resistance of less than 4.6 °C/watt.
Duty Cycle Calculation
When solid-state relays are operated in an on/off mode, it may be advantageous to calculate the RMS value of the current through the SSR for
heat sinking or determining the proper current rating of the SSR for the given application.
Transformer Loads
Careful consideration should be given to the selection of the proper
SSR for driving a given transformer. Transformers are driven from
positive saturation of the iron core to negative saturation of the core
each half cycle of the alternating voltage. Large inrush currents can
occur during the first half cycle of line voltage if a zero-voltage SSR
happens to turn on during the positive half cycle of voltage when
the core is already in positive saturation. Inrush currents greater
than 10 times rated transformer current can easily occur. The
following table provides a guide for selecting the proper SSR for a
given transformer rating.
Heat dissipation: 18 amps x 0.9 watts/amp = 16.2 watts
Temperature rise, junction to SSR base: 16.2 W x 0.67 C/W = 10.9 °C
Allowable temperature of heat sink: 110 C - 10.9 C = 99.1 °C
Allowable temperature rise on heat sink: 99.1 C - 25 C = 74.1 °C
Heat sink thermal resistance limit: (74.1 C)/(16.2 W) = 4.6 °C/watt
IRMS = RMS value of load or SSR
T1 = Time current is on
T2 = Time current is off
ION = RMS value of load current during on period
I RMS =
T1 + T2
(ION)2 x T1
Solid-State Relays
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2006–2009 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Solid-State Relays DATA SHEET
Form 0859-090819
PA G E
15
Solenoid Valve and Contactor Loads
All Opto 22 SSRs are designed to drive inductive loads such as
solenoid valves and electromechanical contactors. The built-in
snubber in each SSR assures proper operation into inductive loads.
The following table is a guide in selecting an SSR to drive a solenoid
or contactor.
Control Current Calculation
All Opto 22 DC-controlled SSRs have a control circuit consisting of
1000 ohms in series with an LED. The LED will drop 1 volt, so the
voltage across the internal resistor will be 1 volt less than the control
voltage.
The control current (IC ) can be calculated from the control voltage
(VC ) as follows:
IC = (VC - 1)/1000
Examples:
3 VDC control voltage:
IC = (3 - 1)/1000 = 0.002 A (2 mA)
32 VDC control voltage:
IC = (32 - 1)/1000 = 0.031 A (31 mA)
For control voltages above 32 VDC, an external resistor can be
added in series with the SSR to limit the control current. Also, if the
device driving the control current to the SSR is limited, you can limit
the control current by using an external resistor (Re).
IC = (VC - 1)/ (Re + 1000)
Re = [(VC - 1)/(IC)] -1000
To limit the control current to 2 mA, this simplifies to:
Re = 500 (VC - 3)
120-Volt Transformers
SSR MODEL TRANSFORMER
P or MP 120D2 100 VA
Z120D10 500 VA
120D3 100 VA
P or MP 120D4 250 VA
120D10 or 120A10 500 VA
120D25 or 120A25 1 KVA
120D45 2 KVA
240-Volt Transformers
P or MP240D2 200 VA
7240D10 1 KVA
120D3 200 VA
P or MP240D4 500 VA
240D10 or 240A10 1 KVA
240D25 or 240A25 2 KVA
240D45 4 KVA
480-Volt Transformers
SSR MODEL TRANSFORMER
480D10-12 5-Amp Primary
480D15-12 5-Amp Primary
120-Volt Coils
SSR CURRENT
RATING SOLENOID CONTACTOR
2-Amp 1-Amp NEMA Size 4
4-Amp 3-Amp NEMA Size 7
240-Volt Coils
SSR CURRENT
RATING SOLENOID CONTACTOR
2-Amp 1-Amp NEMA Size 7
4-Amp 3-Amp NEMA Size 7
Solid-State Relays
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2006–2009 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Solid-State Relays
PA G E
16
DATA SHEET
Form 0859-090819
Opto 22 SSRs for controlling single-phase motors are shown in the
following tables:
Solid-State Relays in Series
In applications requiring greater current rating at higher voltage,
two Opto 22 SSRs may be operated in series for double the voltage
rating. The built-in snubber in each SSR assures proper voltage
sharing of the two SSRs in series. In the following diagram, two
240-volt, 45-amp SSRs are connected in series for operation on a
480-volt line. The control is shown with a parallel hook-up but it
should be noted that a serial connection can also be implemented.
Lamp Loads
Since all Opto 22 SSRs are zero-voltage switching, they are ideal for
driving incandescent lamps, because the initial inrush current into a
cold filament is reduced. The life of the lamp is increased when
switched by a zero-voltage turn-on SSR. The following table is a guide
to selecting an Opto 22 SSR for switching a given incandescent lamp.
Heater Loads
Care should be taken in selecting a SSR for driving a heater load if
the load is cycled on and off in a continuous manner as might occur
in a temperature control application. Constant cycling can cause
thermal fatigue in the thyristor chip at the point where the chip
bonds to the lead frame. Opto 22 employs a thick copper lead frame
for mounting the SCR chips in the power series SSRs to eliminate
120-Volt Single-Phase
Non-Reversing Motors
SSR Model MOTOR RATING
P or MP120D2 1 Amp
Z120D10 1/4 HP
120D3 1-1/2 Amp
P or MP120D4 1-1/2 Amp
120D10 or 120A10 1/4 HP
120D25 or 120A25 1/3 HP
120D45 3/4 HP
240-Volt Single Phase
Non-Reversing Motors
SSR Model MOTOR RATING
P or MP240D2 1 Amp
Z240D10 1/4 HP
240D3 1-1/2 Amp
P or MP240D4 1-1/2 Amp
240D10 or 240A10 1/3 HP
240D25 or 120A25 1/2 HP
240D45 1-1/2 HP
120-Volt Single-Phase
Reversing Motors
SSR Model MOTOR RATING
P or MP240D2 1 Amp
Z240D10 1/4 HP
240D3 1-1/2 Amp
P or MP240D4 1-1/2 Amp
240D10 or 240A10 1/4 HP
240D25 or 120A25 1/3 HP
240D45 3/4 HP
240-Volt Single-Phase
Reversing Motors
SSR Model MOTOR RATING
480D10-12 1/4 HP
480D15-12 1/4 HP
120 Volt Lamps
SSR CURRENT RATING LAMP RATING
2-Amp 100 Watt
4-Amp 400 Watt
10-Amp 1 Kilowatt
25-Am p 2 Ki low att
45-Amp 3 Kilowatt
240 Volt Rating
SSR CURRENT RATING LAMP RATING
2-Amp 200 Watt
4-Amp 800 Watt
10-Amp 2 Kilowatt
25-Am p 4 Ki low att
45-Amp 6 Kilowatt
Solid-State Relays
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2006–2009 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Solid-State Relays DATA SHEET
Form 0859-090819
PA G E
17
thermal fatigue failures. In addition, Opto 22 recommends
operating any SSR at 75% rated current for cycling heater loads to
ensure complete reliability.
The following table is a guide to selecting the proper SSR for a given
heater load.
Single-Phase Reversing Motor Control
The circuit diagram below illustrates a typical 1 Ø motor winding
inductance and the phase shift capacitor can cause twice-line
voltage to appear across the open SSR. A 240-volt SSR should be
used for a 120-volt line. During the transition period when one SSR
is turned on and the other SSR is going off, both SSRs may be on. In
this case, the capacitor may discharge through the two SSRs,
causing large currents to flow, which may destroy the SSRs. The
addition of RL as shown will protect the SSRs from the short circuit
capacitor discharge current.
Nominal SSR
Current Rating
Maximum
Recommended
Heater Current
2-Amp 1½-Amp
4-Amp 2½-Amp
10-Amp 7½-Amp
25-Amp 18-Amp
45-Amp 35-Amp
10 4 80V 8- Amp
10 4 80V 8- Amp
Solid-State Relays
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2006–2009 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Solid-State Relays
PA G E
18
DATA SHEET
Form 0859-090819
Single-Phase Reversing Motor Control (cont.)
The resistors are unnecessary if the control circuit is designed
to ensure that one SSR is off before the other SSR is on.
Three-Phase Motor Control
Three-phase motors may be controlled by solid-state relays as
shown. A third SSR as shown is optional, but not necessary. The
control windings may be connected in series or parallel. Care should
be taken to ensure that the surge current drawn by the motor does
not exceed the surge current rating of the SSR.
Three-Phase Reversing Motor Control
Three-phase reversing motor control can be implemented with four
SSRs as shown in the connection diagram. The SSRs work in pairs
with SSR1 and SSR3 operated for rotation in one direction and SSR2
and SSR4 operated for rotation in the reverse direction. The resistor
R1 as shown in the connection diagram protects against line-to-
line shorts if SSR1 and SSR4 or SSR3 and SSR2 are on at the same
time during the reversing transition period. Use the following table
as a guide to the proper selection of an SSR for this application.
240 Volt Three-Phase Motor
SSR MODEL MOTOR
Z240D25 1/3 HP
Z240D10 3/4 HP
240D10 3/4 HP
240A10 3/4 HP
240D25 2 HP
240A25 2 HP
240D45 3 HP
480 Volt Three-Phase Motors
SSR MODEL MOTOR
480D10-12 1-½ HP
480D15-12 1-½ HP
Opto 22
Relay
Motor Full
Load Rating
Resistor for
120V line
Resistor for
240V line
3-Amp 1.25-Amp 4 ohm 50 W 8 ohm 50 W
10-Amp 5-Amp 1 ohm 100 W 2 ohm 100 W
25-Amp 8-Amp .5 ohm 100 W 1 ohm 100 W
45- Amp 16-Amp .25 ohm 15 0 W .5 ohm 150 W
15-Amp 5-Amp 1 ohm 100 W 2 ohm 100 W
Solid-State Relays
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2006–2009 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Solid-State Relays DATA SHEET
Form 0859-090819
PA G E
19
FAQ: SSR Applications
Q : What is a solid-state relay?
A: A solid-state relay (SSR) is a semiconductor device that can be
used in place of a mechanical relay to switch electricity to a load in
many applications. Solid-state relays are purely electronic, normally
composed of a low current “control” side (equivalent to the coil on
an electromechanical relay) and a high-current load side
(equivalent to the contact on a conventional relay). SSRs typically
also feature electrical isolation to several thousand volts between
the control and load sides. Because of this isolation, the load side of
the relay is actually powered by the switched line; both line voltage
and a load (not to mention a control signal) must be present for the
relay to operate.
Q : What are the advantages of using an SSR over a
mechanical relay?
A: There are many applications that require a moderate amount of
power (W to kW) to be switched on and off fairly rapidly. A good
example would be the operation of a heater element in a
controlled-temperature system. Typically, the amount of heat put
into the system is regulated using pulse-width modulation turning
a fixed-power heating element on and off for time periods ranging
from seconds to minutes. Mechanical relays have a finite cycle life,
as their components tend to wear out over thousands to millions of
cycles. SSRs do not have this problem; in the proper application,
they could be operated almost infinitely.
Q : What are the limitations of using an SSR?
A: SSRs have a few limitations when compared to the capabilities
of their mechanical counterparts. First, because the relay is
semiconductor-based, it will never turn all the way on, nor off. This
means that in the “on” state, the relay still has some internal
resistance to the flow of electricity, causing it to get hot. When in
the “off” state, the relay will exhibit a small amount of leakage
current, typically a few mA. This leakage can conspire to keep some
loads, especially ones with a high impedance, from turning off!
Additionally, SSRs are more sensitive to voltage transients; while
Opto 22 relays are very well transient-protected, if a relay gets hit
hard enough a sufficient number of times, it will die or degrade.
This makes SSRs less ideal for driving highly inductive
electromechanical loads, such as some solenoids or motors. SSRs
should also never be used for applications such as safety power
disconnects, because even in the off state, leakage current is
present. Leakage current through an SSR also implies the presence
of a potentially high voltage. Even though the relay is not
conducting a large amount of current, the switched terminal will
still be “hot,” and thus dangerous.
Q : Do you make multi-pole or multi-throw SSRs?
A: Opto 22 manufactures only single-pole, single-throw SSRs. If
multi-phase operation is required, just use a relay on each phase.
Because of the limitations on semiconductor devices of the type
used in SSRs, it is not practical to build single-device multi-throw
SSRs. However, an alternative to multi-throw operation may be
accomplished with multiple relays.
Q : Can I hook up SSRs in parallel to achieve a higher
current rating?
A: No. There is no way to guarantee that two or more relays will
turn on simultaneously when operated in parallel. Each relay
requires a minimum voltage across the output terminals to
function; because of the optical isolation feature, the “contact” part
of the SSR is actually powered by the line it switches. One relay
turning on before the other will cause the second relay to lose its
turn-on voltage, and it won’t ever turn on, or at least not until the
first relay fails from carrying too much current.
Q : What does a “zero-crossing” turn-on circuit refer
to?
A: “Zero-crossing” turn-on and turn-off refer to the point on the AC
wave form when the voltage is zero. It is at this point that an AC SSR
will turn on or off. All Opto 22 AC relays are designed with a zero-
crossing turn-on and turn-off circuit. When the AC circuit voltage is
at zero, no current is flowing. This makes it much easier and safer for
the semiconductor device in the relay to be turned on or off. It also
generates much less electrical EMI/RFI noise.
Q : Can I use an AC SSR to switch DC?
A: No. Because of the zero-crossing circuit described above, the
relay will most likely never turn on, and even if it is on, it will likely
not be able to be turned off, as DC voltage typically never drops to
zero.
Q : Can I use a DC SSR to switch AC?
A: No. The semiconductor device used in Opto 22’s DC SSRs is
polarized. It may break down and conduct for the portion of the
waveform that is reversed in polarity.
Q : Can a DC SSR be used to switch an analog signal?
A: This is not recommended at all. First, the voltage drop across the
relay will cause signal loss. Second, the conduction characteristics of
the SSR are very non-linear at low operating voltages and currents.
Use a mechanical relay; it will work much better.
Solid-State Relays
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2006–2009 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Solid-State Relays
PA G E
20
DATA SHEET
Form 0859-090819
Q : What agency approvals do your SSRs carry?
A: In general, Opto 22 relays carry UL, CSA, and CE approval. See
http://support.opto22.com. Additionally, some SSRs contain
VDE-approved optocouplers; contact Opto 22 for more information.
FAQ: SSR Troubleshooting
Q : My SSR does not function anymore. What may
have happened?
A: There is no “normal” mode of failure for SSRs. They just stop
working, by refusing to turn on or off. An improper installation is
often to blame for an SSR failure, as these are very simple, reliable
devices. If you have a failed SSR, it is important to look at the normal
operating parameters of that relay within the larger system to make
sure that the relay being used is appropriate to the application, and
that the relay is being properly installed in the system. The three
most common causes of SSR failure are as follows:
•SSR improperly matched to load. The relay was destroyed
by overheating from carrying too much current too long.
•SSR insufficiently protected. Remember, a semiconductor
is less tough than a simple metal contact. Reverse voltages
exceeding the PRV rating of the relay will cause damage. Volt-
age spikes on the switched line, perhaps from inductive kick-
back, may have destroyed one or more of the internal switching
devices. Remember to use snubbers, transorbs, MOVs, and/or
commutating diodes on highly inductive loads.
•SSR improperly installed. The SSR was not mounted to a
large enough heat sink, or no thermal compound was used,
causing the relay to overheat. Also, insufficient tightening of the
load terminals can cause arcing and ohmic heating of the relay.
Opto 22 recommends 18 inch-pounds of torque on the load
screw terminals. Similar failures have also been attributed to
the use of crimp-on terminal lugs or spades; make sure such
terminals are tightly crimped, and even drip some solder into
the joint to ensure good electrical contact and protection from
corrosion.
Q : How can I test my SSR?
A: It is not possible to test an SSR by the same methods used to test
mechanical relays; a typical SSR will always show an infinite
impedance to a resistance meter placed across the output
terminals. There are a few reasons for this. First, the SSR requires a
small amount of power to operate, derived from whatever voltage
source is placed on the load terminals. A typical multimeter will not
supply sufficient voltage to cause the relay to change state. Second,
AC SSRs contain a zero-crossing circuit, which will not allow them
to change state unless zero voltage is applied. Most test equipment
will supply a DC voltage to the relay, and the relay will thus never
see the zero it requires to change state. To test an SSR, it is best to
operate it at the actual line voltage it will be used at, driving a load
such as a large light bulb.
Q : I have an SSR driving a load. The load turns on
okay, but never seems to turn off, unless I remove
power from the relay entirely. What might be hap-
pening?
A: This is normally a problem when using an SSR with a high-
impedance load, such as a neon lamp or a small solenoid. Loads like
these often have relatively large initial currents, but relatively small
“hold in” currents. The result is that the off-state leakage current
through the relay (see previous section) is insufficient to cause the
load to turn on to start with, but sufficient to keep it on, once
started. The solution is to place a power resistor, sized for 8–10
times the rated maximum leakage current for the SSR in parallel
with the load. Make sure that this resistor has a high enough power
rating for the application. For example, for a 5 mA leakage current at
120 VAC, a resistor drawing 50 mA would be desirable. Using Ohm’s
Law, the resistor value becomes 2,400 ohms. This resistor will
dissipate 6 watts, so a 7.5 or 10-watt size power resistor should be
used.
Q : I have a new AC SSR driving a solenoid. It turns on
okay once, but will not turn on again. What is going
on?
A: Some solenoids, some types of halogen lights, and some types
of strobe lights incorporate a diode in series with the coil or
filament. This causes the light to behave as a half-wave rectifier.
Opto 22 SSRs have a built-in R-C snubber circuit in parallel with the
output. The capacitor in this circuit charges up but cannot discharge
through the series diode, causing a voltage to appear across the SSR
terminals. Because the SSR must see a zero voltage across the
terminals to come on, it can’t turn on again in this situation. The
solution here would be to put a high-value resistor (several tens of
Kohms) across the terminals of the relay, to allow the capacitor to
drain its charge.
More About Opto 22
www.opto22.com • Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • Form 1335-090113
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2009 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Products
Opto 22 develops and manufactures reliable, flexible, easy-to-use
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distribution, SNAP PAC brains provide distributed intelligence for
I/O processing and communications. Brains offer analog, digital,
and serial functions, including thermocouple linearization; PID loop
control; and optional high-speed digital counting (up to 20 kHz),
quadrature counting, TPO, and pulse generation and measurement.
SNAP I/O
I/O provides the local connection to sensors and equipment.
Opto 22 SNAP I/O offers 1 to 32 points of reliable I/O per module,
depending on the type of module and your needs. Analog,
digital, serial, and special-purpose modules are all mixed on
the same mounting rack and controlled by the same processor
(SNAP PAC brain or rack-mounted controller).
Quality
Founded in 1974 and with over 85 million devices sold,
Opto 22 has established a worldwide reputation for high-
quality products. All are made in the U.S.A. at our
manufacturing facility in Temecula, California. Because we
do no statistical testing and each part is tested twice before leaving
our factory, we can guarantee most solid-state relays and optically
isolated I/O modules for life.
Free Product Support
Opto 22’s Product Support Group offers free, comprehensive
technical support for Opto 22 products. Our staff of support
engineers represents decades of training and experience. Product
support is available in English and Spanish, by phone or email,
Monday through Friday, 7 a.m. to 5 p.m. PST.
Free Customer Training
Hands-on training classes for the SNAP PAC System are offered at
our headquarters in Temecula, California. Each student has his or
her own learning station; classes are limited to nine students.
Registration for the free training class is on a first-come, first-served
basis. See our website, www.opto22.com, for more information or
email training@opto22.com.
Purchasing Opto 22 Products
Opto 22 products are sold directly and through a worldwide
network of distributors, partners, and system integrators. For more
information, contact Opto 22 headquarters at 800-321-6786 or
951-695-3000, or visit our website at www.opto22.com.
www.opto22.com