A Global Leader in the Design, Development, and
Manufacture of Sensor and Magnetic Components
Series Datasheet – MRX Reed Relays www.standexmeder.com
MRX Series
Reed Relays
Features: Ex-Approved for Intrinsic Safety Circuits
Applications: Process Automatization in Refineries, Mining and Chemical Industry & Others
Markets: Explosive Environment & Others
Part
Description: M R X 00- 0 X 00
Nominal Voltage Contact QTY Contact Form Switch Model
05, 12, 24 1, 2, 4 A, C 21, 71, 79, 90
Customer
Options Switch Model Unit
Contact Data
21 71 79 90
Rated Power
(max.)
Any
DC combination of V&A not to exceed their individual max.’s 5 10 10 7 W
Switching Voltage
(max.)
DC or
peak AC 100 200 250 28 V
Switching Current
(max.)
DC
or peak AC 0.25 0.5 0.5 0.24 A
Carry Current
(max.)
DC
or peak AC 0.5 1.25 1 0.5 A
Contact Resistance
(max.)
@
0.5V & 50mA 150 150 150 150 mOhm
Breakdown
Voltage (min.)
According
to EN60255-5 0.25 0.3 0.4 0.25 kVDC
Operating
Time (max.)
Incl. Bounce; Measured with w/ Nominal Voltage
2.5 0.5 0.5 2 ms
Release Time (max.)
Measured
with no Coil Excitation 2 0.1 0.2 2 ms
Insulation
Resistance (typ.)
Rh<45
%, 100V Test Voltage 109 1010 1011 109 Ohm
Capacitance
(typ.)
@
10kHz across open Switch 0.8 0.3 0.4 1.0 pF
Modifications in the sense of technical progress are reserved.
Version 01
27.01.2015
USA: +1.866.782.6339 │ salesusa@standexmeder.com
Europe: +49.7731.8399.0 │ info@standexmeder.com
Asia: +86.21.37820625 │ salesasia@standexmeder.com
A Global Leader in the Design, Development, and
Manufacture of Sensor and Magnetic Components
Series Datasheet – MRX Reed Relays www.standexmeder.com
MRX Reed Relay
Environmental
Data Unit
Shock Resistance (max.)
1/2 sine wave duration 11ms
50 g
Vibration
Resistance (max.) 20 g
Operating Temperature
-20 to 85 °C
Storage Temperature
-40 to 105 °C
Soldering
Temperature (max.)
5 sec. max.
260 °C
Life Test Data
*Load increase reduces life
expectancy of Reed Switches
Coil Data Coil Voltage
(nom.)
Coil Resistance
(typ.)
Pull-In Voltage
(max.)
Drop-Out Voltage
(min.)
Nominal Coil Power
(typ.)
Contact
Form
Switch
Model
Unit VDC Ohm VDC VDC mW
1A 71
79*
05 360 3.8 1.0 70
12 305 9 2 110
24 5,880 18 3.5 100
2A 71
79**
05 250 3.8 1.0 100
12 890 9 2 260
24 1,000 18 3.5 165
4A 71 24 1,780 18 3.5 320
1C
21***
90
05 360 3.8 1.0 70
12 305 9 2 110
24 5,880 18 3.5 100
The Pull
-In / Drop-Out Voltage and Coil Resistance will change at rate of 0.4% per °C.
*1A79
only available with Coil Voltage 12 ** 2A79 only available with Coil Voltage 24 ***1C21 only available with Coil Voltage 05 & 12
Handling
& Assembly Instructions
Switching inductive and/or capacitive loads create voltage
and/or current peaks, which may damage the relay.
Protective circuits need to be used.
External magnetic fields needs to be taken into
consideration, including a too high packing density. This may
influence the relays’ electrical characteristics.
Mechanical shock impacts e.g. dropping the relays may cause
immediate or post-installation failure.
Wave soldering: maximum 260°/5 seconds.
Reflow soldering: Recommendations given by the soldering
paste manufacturer need to be considered as well as the
temperature limits of other components/processes.
Modifications in the sense of technical progress are reserved.
Version 01
27.01.2015
USA: +1.866.782.6339 │ salesusa@standexmeder.com
Europe: +49.7731.8399.0 │ info@standexmeder.com
Asia: +86.21.37820625 │ salesasia@standexmeder.com
A Global Leader in the Design, Development, and
Manufacture of Sensor and Magnetic Components
Series Datasheet – MRX Reed Relays www.standexmeder.com
Pin Out
Top View
Modifications in the sense of technical progress are reserved.
Version 01
27.01.2015
USA: +1.866.782.6339 │ salesusa@standexmeder.com
Europe: +49.7731.8399.0 │ info@standexmeder.com
Asia: +86.21.37820625 │ salesasia@standexmeder.com
Glossary
Contact Form
Form
A
NO = Normally Open Contacts
SPST = Single Pole Single
Throw
Form B
NC = Normally Closed
Contacts
SPST
= Single Pole Single Throw
Form C
Changeover
SPDT = Single Pole Double
Throw
