118 COTO TECHNOLOGY (USA) Tel: (401) 943-2686 / Fax (401) 942-0920 6 (Europe) Tel: +31-45-5439343 / Fax +31-45-5427216
RI-03 Series
Micro dry-reed switch hermetically sealed in a gas-filled envelope.
Single-pole, single-throw (SPST) type, having normally open contacts,
and containing two magnetically actuated reeds.
The switch is of the double-ended type and may be actuated by an
electromagnet, a permanent magnet or a combination of both.
The device is intended for use in sensors, relays, pulse counters or
similar devices.
RI-03 Series Features
Ideal for general purpose reed relays and sensors
Contact layers: Gold/copper, sputtered or plated
ruthenium (can vary)
Superior glass-to-metal seal and blade alignment
RI-03 Series Dry Reed Switch
General data for all models RI-03
AT-Customization / Preformed Leads
Besides the standard models, customized products
can also be supplied offering the following options:
! Operate and release ranges to customer
specification
! Cropped and/or preformed leads
Coils
All characteristics are measured using the Philips
Standard Coil. For definitions of the Philips Stan-
dard Coil, refer to “Application Notes” in the Reed
Switch Technical & Application Information Section of
this catalog.
Life expectancy and reliability
The life expectancy data given below are valid for a
coil energized at 1.25 times the published maximum
operate value for each type in the RI-03 series.
No load conditions (operating frequency:
100Hz)
Life expectancy : min. 108 operations with a failure
rate of less than 10-9 with a confidence level of 90%.
End of life criteria:
Contact resistance > 1Ω after 2 ms
Release time > 2 ms (latching or contact sticking).
Loaded conditions (resistive load: 12 V; 4 mA;
(15 mA peak); operating frequency: 170 Hz)
Life expectancy: min. 106 operations with a failure rate
of less than 10-8 with a confidence level of 90%.
End of life criteria:
Contact resistance > 2Ω after 4 ms
Release time > 0.7 ms (latching or contact sticking).
Switching different loads involves different life expect-
ancy and reliability data. Further information is avail-
able on request.
Mechanical Data
Contact arrangement is normally open; lead finish is
tinned; net mass is approximately 190 mg; and can be
mounted in any position.
Shock
The switches are tested in accordance with
“IEC 68-2-27”, test Ea (peak acceleration 150 G, half
Dimensions in inches (mm)
119
For Most Recent Data, Consult the Coto Technology Website: www.cotorelay.com 6 E-mail: info@cotorelay.com
RI-03 Series Dry Reed Switch
Vibration
The switches are tested in accordance with “IEC 68-2-
6”, test Fc (acceleration 10G; below cross-over fre-
quency 57 to 62 Hz; amplitude 0.75 mm;
frequency range 10 to 2000 Hz, duration 90 minutes).
Such a vibration will not cause an open switch (no
magnetic field present) to close, nor a switch kept
closed by an 80 AT coil to open.
Mechanical Strength
The robustness of the terminations is tested in accor-
dance with “IEC 68-2-21”, test Ua1 (load 40 N).
Operating and Storage Temperature
Operating ambient temperature; min: -55°C;
max: +125°C.
Storage temperature; min: -55°C; max: +125°C.
Note: Temperature excursions up to 150°C may be
permissible. For more information contact your nearest
Coto Technology sales office.
Soldering
The switch can withstand soldering heat in accordance
with “IEC 68-2-20”, test Tb, method 1B: solder bath at
350 ±10°C for 3.5 ±0.5 s. Solderability is tested in
accordance with “IEC 68-2-20”, test Ta, method 3:
solder globule temperature 235°C; ageing 1b: 4 hours
steam.
Welding
The leads can be welded.
Mounting
The leads should not be bent closer than 1 mm to the
glass-to-metal seals. Stress on the seals should be
avoided. Care must be taken to prevent stray magnetic
fields from influencing the operating and measuring
conditions.
sinewave; duration 11 ms). Such a shock will not cause
an open switch (no magnetic field present) to close,
nor a switch kept closed by an 80 AT coil to open.
Model Number
RI-03AAA RI-03AA RI-03A RI-03B
Parameters Test Conditions Units
Operating Characteristics
Operate Range AT 6-16 14-23 18-32 28-52
Release Range AT 3-15.5 6-21 7-27 10-36
Operate Time - including bounce (typ.) ms 0.1(20AT) 0.25(29AT) 0.25(40AT) 0.25(65AT)
Bounce Time (typ.) ms 0.05(20AT) 0.15(29AT) 0.15(40AT) 0.15(65AT)
Release Time (max)
µ
s70(20AT) 30(29AT) 30(40AT) 30(65AT)
Resonant Frequency (typ.) Hz 5500 5500 5500 5500
Electrical Characteristics
Switched Power (max) W 5 10 10 10
Switched Voltage DC (max) V 160 200 200 200
Switched Voltage AC, RMS value (max) V 110 140 140 140
Switched Current DC (max) mA 250 500 500 500
Switched Current AC, RMS value (max) mA 250 500 500 500
Carry Current DC (max) A 1 1.5 2.5 2.5
Breakdown Voltage (min) V 200 250 300 350
Contact Resistance (initial max) (energization) m
Ω
120 (20 AT) 120 (25 AT) 120 (30AT) 120 (40 AT)
Contact Resistance (initial typ.) (energization) m
Ω
70 (20 AT) 70 (25 AT) 70 (30 AT) 70 (40 AT)
Contact Capacitance (max) without test coil pF 0.3 0.3 0.25 0.25
Insulation Resistance (min) RH
≤
45% M
Ω
10
6
10
6
10
6
10
6
