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. 518-7297
Mfr. Part No.3UG4513-1BR20
BrandSiemens
TWD4,977.00
Each
units
Phase, Voltage - DPDT Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20s - - -
RS Stock No. 857-7280
Mfr. Part No.DWB01CM4810A
TWD9,501.00
Each
units
Power Factor - SPDT - 3 - - - 5 A, 10A - 1 → 30s - - -
RS Stock No. 124-0185
Mfr. Part No.RM22TU21
TWD2,808.00
Each
units
Phase, Voltage - DPDT Undervoltage 3 200 → 240V ac - - - Phase Failure, Phase Sequence - - - -
RS Stock No. 261-909
Mfr. Part No.84873021
BrandCrouzet
TWD3,163.00
Each
units
Phase - DPDT - 3 - - - - Phase Failure, Phase Sequence 500ms - - -
RS Stock No. 876-4989
Mfr. Part No.1SVR740720R1400 CM-MSS.11P
BrandABB
TWD4,398.00
Each
units
Temperature - SPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 179-3540
Mfr. Part No.184773 & EMR6-R400-A-1
BrandEaton
TWD6,865.00
Each
units
Insulation - - - - 0 → 400V ac - - - - - - - -
RS Stock No. 876-5017
Mfr. Part No.1SVR740700R0200 CM-MSS.22P
BrandABB
TWD3,192.00
Each
units
Temperature - DPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 876-4991
Mfr. Part No.1SVR740700R0100 CM-MSS.12P
BrandABB
TWD2,910.00
Each
units
Temperature - SPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 179-3541
Mfr. Part No.184774 & EMR6-R400-A-2
BrandEaton
TWD18,577.00
Each
units
Insulation - - - - 0 → 400V ac - - - - - - - -
RS Stock No. 876-5020
Mfr. Part No.1SVR740700R2200 CM-MSS.23P
BrandABB
TWD3,192.00
Each
units
Temperature - DPDT - 1 - - - - - <100ms Overtemperature, Winding Temperature - -
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. 175-2272
Mfr. Part No.3RN2000-2AW30
BrandSiemens
TWD2,761.00
Each
units
- - SPDT Motor Voltage - 24 → 240V ac/dc - - - - - - - -
RS Stock No. 203-3903
Mfr. Part No.3UG4621-2AW30
BrandSiemens
TWD7,054.00
Each
units
Current - SPDT - 1 - - - - - - - - -
RS Stock No. 179-0019
Mfr. Part No.RMNF22TB30
TWD5,512.00
Each
units
Frequency, Voltage with NFC - - - 3 - - - - - - - - -
RS Stock No. 175-2287
Mfr. Part No.3RN2012-1BW31
BrandSiemens
TWD10,420.00
Each
units
Thermistor motor temperature protection - DPDT Motor Voltage - 24 → 240V ac/dc - - - - - - - -
RS Stock No. 442-9455
Mfr. Part No.1SVR550881R9400
BrandABB
TWD2,831.00
Each
units
Phase - SPST - 1, 3 - - - - NEUTRAL 150ms - - -
RS Stock No. 179-3552
Mfr. Part No.184783 & EMR6-IF15-A-1
BrandEaton
TWD7,356.00
Each
units
Current - - - 1 - - 0.3 A, 1 A, 3A 1.5 A, 5 A, 15A - 0.1 → 30s - - -
RS Stock No. 876-4995
Mfr. Part No.1SVR730700R2100 CM-MSS.13S
BrandABB
TWD2,825.00
Each
units
Temperature - SPDT - 1 - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 916-0110
Mfr. Part No.PMV50A240
BrandLovato
TWD6,601.00
Each
units
Voltage - SPDT Self Powered 3 Maximum of 400V ac - - - - 0.1 → 20s - - -
RS Stock No. 876-5051
Mfr. Part No.1SVR740712R1300
BrandABB
TWD7,361.00
Each
units
Temperature - DPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -