Monitoring Relays

Monitoring relays are a type of relay that trips a circuit breaker when a fault is detected. A relay is an electrically controlled switch that is used to turn the power on or off in a circuit. 




Monitoring relays are more sophisticated than regular relays, as they have adjustable operating conditions, whereas normal relays switch according to a fixed threshold. They measure a given parameter, such as voltage or temperature, and will trip a circuit breaker when the parameter gets too high or low. 




What are monitoring relays used for?


Monitoring relays have a wide range of uses, depending largely on the factor being monitored. For example, they can protect against overcurrent if measuring current, or they can detect an abnormally low frequency if frequency is being measured.




Types of monitoring relay


The main way in which monitoring relays differ is the function that they measure. This can be a number of things, including:



  • voltage

  • current

  • temperature

  • frequency


The factor that you need to measure will decide which monitoring relay you choose.


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Description Price Monitoring Application Supply Voltage Contact Configuration Voltage Sensitivity Electrical Phase Voltage Sensing Range Current Sensitivity Minimum Current Sensed Maximum Current Sensed Phase Sensitivity Time Delay Temperature Sensitivity Temperature Sensing Range Frequency Sensing Range
RS Stock No. 175-2292
Mfr. Part No.3RN2013-1BW30
BrandSiemens
£133.22
Each
Units
Thermistor motor temperature protection 240 V ac/dc DPDT Motor Voltage - 24 → 240 V ac/dc - - - - - - - -
RS Stock No. 175-2295
Mfr. Part No.3RN2013-2BW30
BrandSiemens
£137.04
Each
Units
Thermistor motor temperature protection 240 V ac/dc DPDT Motor Voltage - 24 → 240 V ac/dc - - - - - - - -
RS Stock No. 175-2273
Mfr. Part No.3RN2010-1BA30
BrandSiemens
£57.27
Each
Units
Thermistor motor temperature protection 24 V ac/dc DPDT Motor Voltage - - - - - - - - - -
RS Stock No. 175-2284
Mfr. Part No.3RN2011-2BW30
BrandSiemens
£74.90
Each
Units
Thermistor motor temperature protection 240 V ac/dc DPDT Motor Voltage - 24 → 240 V ac/dc - - - - - - - -
RS Stock No. 181-2789
Mfr. Part No.MK9055N.38/500
BrandDold
£156.05
Each
Units
Speed - - - - - - - - - - - - -
RS Stock No. 916-0154
Mfr. Part No.PMV70A575
BrandLovato
£93.50
Each
Units
Voltage 380 → 575 V ac SPDT Self Powered 3 Maximum of 400 V ac - - - - 0.1 → 20 s - - -
RS Stock No. 175-2298
Mfr. Part No.3RN2023-2DW30
BrandSiemens
£195.37
Each
Units
Thermistor motor temperature protection 240 V ac/dc CO, NO Motor Voltage - 24 → 240 V ac/dc - - - - - - - -
RS Stock No. 131-791
Mfr. Part No.Z-TN230/SS
BrandEaton
£56.80
Each
Units
- 230 V ac DPST - - - - - - - - - - 50 Hz
RS Stock No. 179-3520
Mfr. Part No.EMR6-I15-B-1
BrandEaton
£121.86
Each
Units
Current 220 → 240 V ac - - 1 - - 0.3 → 1.5 A, 1 → 5 A, 3 → 15 A 1.5 A, 5 A, 15 A - 0.1 → 30 s - - -
RS Stock No. 179-3544
Mfr. Part No.EMR6-W380-L-1
BrandEaton
£62.70
Each
Units
Phase, Voltage 380 V - - - - - - - - 0.1 → 30 s - - 50 → 60 Hz
RS Stock No. 181-2806
Mfr. Part No.MK7830N.82PC AC/DC24V + AC230V 0,02s-9999h
BrandDold
£129.77
Each
Units
Multifunction 24 V ac/dc, 230 V ac DPDT - - 250 V - - - - 0.02 s → 9999 h - - -
RS Stock No. 179-3530
Mfr. Part No.EMR6-AW500-D-1
BrandEaton
£139.47
Each
Units
Phase, Voltage 300 → 500 V ac - - - 300 → 500 V ac - - - - 0.1 → 30 s - - 50 → 60 Hz
RS Stock No. 916-0110
Mfr. Part No.PMV50A240
BrandLovato
£71.47
Each
Units
Voltage 208 → 240 V ac SPDT Self Powered 3 Maximum of 400 V ac - - - - 0.1 → 20 s - - -
RS Stock No. 175-2276
Mfr. Part No.3RN2010-1CW30
BrandSiemens
£59.92
Each
Units
Thermistor motor temperature protection 240 V ac/dc SPDT Motor Voltage - 24 → 240 V ac/dc - - - - - - - -
RS Stock No. 179-3536
Mfr. Part No.EMR6-AWN280-D-1
BrandEaton
£145.86
Each
Units
Phase, Voltage 180 → 280 V ac - - - 180 → 280 V ac - - - - 0.1 → 30 s - - 50 → 60 Hz
RS Stock No. 179-9435
Mfr. Part No.RM22UA23MR
£110.00
Each
Units
Phase 24 → 240 V ac/dc DPDT Overvoltage 1 15 → 500 V ac/dc - - - - - - - -
RS Stock No. 179-3527
Mfr. Part No.EMR6-A300-C-1
BrandEaton
£72.17
Each
Units
Phase, Voltage 160 → 300 V ac - - - 160 → 300 V ac - - - - 0.1 → 30 s - - 50 → 60 Hz
RS Stock No. 181-2774
Mfr. Part No.MK5880N.38/200
BrandDold
£167.11
Each
Units
Insulation 12 V dc, 24 V dc, 220 → 240 V ac, 380 → 415 V ac 2 x 1 CO - 1, 3 0 → 500 V ac - - - - 1.3 s - - 10 → 1000 Hz
RS Stock No. 175-2291
Mfr. Part No.3RN2013-1BA30
BrandSiemens
£122.62
Each
Units
Thermistor motor temperature protection 24 V ac/dc DPDT Motor Voltage - - - - - - - - - -
RS Stock No. 175-2294
Mfr. Part No.3RN2013-2BA30
BrandSiemens
£126.49
Each
Units
Thermistor motor temperature protection 24 V ac/dc DPDT Motor Voltage - - - - - - - - - -
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