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. 179-3525
Mfr. Part No.184759 & EMR6-PH22
BrandEaton
TWD350.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 916-0132
Mfr. Part No.PMV55A240
BrandLovato
TWD6,151.00
Each
units
Voltage - SPDT Self Powered 1 Maximum of 400V ac - - - - 0.1 → 20s - - -
RS Stock No. 175-2276
Mfr. Part No.3RN2010-1CW30
BrandSiemens
TWD3,623.00
Each
units
Thermistor motor temperature protection - SPDT Motor Voltage - 24 → 240V ac/dc - - - - - - - -
RS Stock No. 376-3710
Mfr. Part No.TR4801-01-110/240VAC
BrandTempatron
TWD4,236.00
Each
units
Speed - SPDT - - - - - - - - - - -
RS Stock No. 775-7918
Mfr. Part No.1SVR730885R3300 CM-MPS.21S
BrandABB
TWD8,726.00
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 180 → 280V ac - - - NEUTRAL, Phase Failure, Phase Imbalance, Phase Sequence 0s, 0.1 → 30 s - - 45 → 65Hz
RS Stock No. 890-3875
Mfr. Part No.2902035
TWD7,193.00
Each
units
Current, Voltage - SPDT - - - Overcurrent 0mA 24mA - - - - -
RS Stock No. 850-5409
Mfr. Part No.LMCVR-20V 24-230VAC/DC
TWD3,763.00
Each
units
Voltage - SPDT Overvoltage, Undervoltage - - - - - - 0.1 → 30s - - -
RS Stock No. 188-3540
Mfr. Part No.LPRC/2-NFC
TWD3,557.00
Each
units
Phase Voltage - SPDT - 3 - - - - - - - - -
RS Stock No. 175-2285
Mfr. Part No.3RN2012-1BA30
BrandSiemens
TWD5,891.00
Each
units
Thermistor motor temperature protection - DPDT Motor Voltage - - - - - - - - - -
RS Stock No. 857-7072
Mfr. Part No.DIA53S72450A
TWD4,956.00
Each
units
Current - SPST - 1 - Overcurrent - - - <300ms - - -
New
RS Stock No. 211-3715
Mfr. Part No.3UG4501-2AW30
BrandSiemens
TWD4,769.00
Each
units
Resistance - - - - - - - - - - - - -
RS Stock No. 758-6930
Mfr. Part No.3UG4622-2AW30
BrandSiemens
TWD7,054.00
Each
units
Current - SPDT - - - Overcurrent, Undercurrent 50mA 15A - 0.1 → 20s - - -
RS Stock No. 916-0189
Mfr. Part No.PMA20240
BrandLovato
TWD5,932.00
Each
units
Current - SPDT - 1 - Overcurrent 0.25A 16A - 0.1 → 30s - - -
RS Stock No. 857-7696
Mfr. Part No.DPB01CM48
TWD9,213.00
Each
units
Phase, Voltage - SPDT Overvoltage, Undervoltage 3, 3+N 323 → 550V ac - - - Phase Loss, Phase Sequence 1 s, 6s - - -
RS Stock No. 819-3210
Mfr. Part No.K8AK-AS3 100-240VAC
BrandOmron
TWD3,919.00
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent 10A 200A - - - - -
RS Stock No. 111-3088
Mfr. Part No.K8DT-AS1CD
BrandOmron
TWD4,018.00
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent 2 mA, 10 mA, 20mA 20 mA, 100 mA, 500mA - 250ms - - -
RS Stock No. 175-2292
Mfr. Part No.3RN2013-1BW30
BrandSiemens
TWD8,056.00
Each
units
Thermistor motor temperature protection - DPDT Motor Voltage - 24 → 240V ac/dc - - - - - - - -
New
RS Stock No. 213-1304
Mfr. Part No.3UG4615-2CR20
BrandSiemens
TWD8,937.00
Each
units
Phase - DPDT - 3 - - - - - - - - -
RS Stock No. 518-7095
Mfr. Part No.3RS1142-1GW80
BrandSiemens
TWD15,029.00
Each
units
Temperature - SPST - - - - - - - 0 → 999s Overtemperature, Undertemperature -99 → +1800°C -
RS Stock No. 876-5783
Mfr. Part No.1SVR730740R9200 CM-TCS.22S
BrandABB
TWD7,329.00
Each
units
Temperature - SPDT - 3 - - - - - 20ms Overtemperature, Temperature Window Monitoring, Undertemperature 0 → +100°C 45 → 65Hz