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. 175-2293
Mfr. Part No.3RN2013-1GW30
BrandSiemens
£143.36
Each
Units
Thermistor motor temperature protection 240 V ac/dc DPDT Motor Voltage - 24 → 240 V ac/dc - - - - - - - -
RS Stock No. 175-2296
Mfr. Part No.3RN2013-2GW30
BrandSiemens
£143.36
Each
Units
Thermistor motor temperature protection 240 V ac/dc DPDT Motor Voltage - 24 → 240 V ac/dc - - - - - - - -
RS Stock No. 175-2274
Mfr. Part No.3RN2010-1BW30
BrandSiemens
£63.16
Each
Units
Thermistor motor temperature protection 240 V ac/dc DPDT Motor Voltage - 24 → 240 V ac/dc - - - - - - - -
RS Stock No. 171-7045
Mfr. Part No.2906252
£50.33
Each
Units
Temperature 230 V ac SPDT - - - - - - - - Winding Temperature - -
RS Stock No. 179-3524
Mfr. Part No.EMR6-N100-N-1
BrandEaton
£41.02
Each
Units
Level 110 → 130 V ac, 220 → 240 V ac - - - - - - - - - - - -
RS Stock No. 175-2288
Mfr. Part No.3RN2012-2BA30
BrandSiemens
£97.43
Each
Units
Thermistor motor temperature protection 24 V ac/dc DPDT Motor Voltage - - - - - - - - - -
RS Stock No. 179-9431
Mfr. Part No.RM22TA31
£107.00
Each
Units
Phase 200 → 240 V ac DPDT Overvoltage 3 <100 V ac - - - - 30 s - - -
RS Stock No. 916-0132
Mfr. Part No.PMV55A240
BrandLovato
£136.55
Each
Units
Voltage 208 → 240 V ac SPDT Self Powered 1 Maximum of 400 V ac - - - - 0.1 → 20 s - - -
RS Stock No. 181-2793
Mfr. Part No.MK9143N.38 +/-5Hz UH=DC24V tv=0-20s tan=0-30s
BrandDold
£156.05
Each
Units
Frequency 24 V dc 2 x 1CO - - - - - - - 0 → 20 s, 0 → 30 s - - ±5 Hz
RS Stock No. 179-3548
Mfr. Part No.EMR6-IM1-A-1
BrandEaton
£86.98
Each
Units
Current 24 → 240 V ac/dc - - 1 - - 0.003 A, 0.01 A, 0.1 A 0.03 A, 0.1 A, 1 A - 0.1 → 30 s - - -
RS Stock No. 135-6181
Mfr. Part No.LPRC/2 400V
£77.70
Each
Units
Voltage 400 V SPDT - 3 243 → 540 V - - - Phase Failure, Phase Sequence 0.2 → 10 s - - -
RS Stock No. 181-2785
Mfr. Part No.LH5946.48/61 0,2-4V UH=AC230V 0,2-6s
BrandDold
£429.92
Each
Units
Standstill 230 V ac 3NO/NC - - 0.2 → 4 V - - - - 0.2 → 6 s - - -
RS Stock No. 182-9994
Mfr. Part No.E3YM230VS20
BrandTele
£73.54
Each
Units
Voltage 230/132 V ac DPDT - 1, 3 - - - - - 30 ms - - 48 → 63 Hz
RS Stock No. 175-2285
Mfr. Part No.3RN2012-1BA30
BrandSiemens
£97.43
Each
Units
Thermistor motor temperature protection 24 V ac/dc DPDT Motor Voltage - - - - - - - - - -
RS Stock No. 181-2790
Mfr. Part No.MK9837N.12 5-600Hz UH=AC230V
BrandDold
£156.05
Each
Units
Frequency 230 V ac DPDT - - 15 → 280 V ac, 30 → 550 V ac - - - - 0 → 100 s, 0 → 50 s - - 5 → 600 Hz
RS Stock No. 181-2782
Mfr. Part No.LH5946.48/61 20-400mV UH=DC24V 0,2-6s
BrandDold
£429.92
Each
Units
Standstill 24 V dc 3NO/NC - - 20 → 400 mV - - - - 0.2 → 6 s - - -
RS Stock No. 179-3554
Mfr. Part No.EMR6-VF600-A-1
BrandEaton
£86.98
Each
Units
Voltage 24 → 240 V ac/dc - - 1 24 → 240 V ac/dc - - - - 0.1 → 30 s - - -
RS Stock No. 916-0164
Mfr. Part No.PMV70NA600
BrandLovato
£98.25
Each
Units
Voltage 480 → 600 V ac SPDT Self Powered 3 Maximum of 400 V ac - - - - 0.1 → 20 s - - -
RS Stock No. 175-2281
Mfr. Part No.3RN2011-1BA30
BrandSiemens
£70.92
Each
Units
Thermistor motor temperature protection 24 V ac/dc DPDT Motor Voltage - - - - - - - - - -
RS Stock No. 179-3516
Mfr. Part No.EMR6-F500-G-1
BrandEaton
£72.44
Each
Units
Phase, Voltage 200 → 500 V ac - - - 200 → 500 V ac - - - - - - - 50 → 60 Hz
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