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. 775-7936
Mfr. Part No.1SVR730824R9300
BrandABB
SGD163.97
Each
units
Phase - DPDT - 3 - - - - Phase Failure, Phase Sequence 500ms - - 45 → 65Hz
RS Stock No. 775-7895
Mfr. Part No.1SVR730794R3300
BrandABB
SGD379.49
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 300 → 500V ac - - - Phase Failure, Phase Sequence 0s, 0.1 → 30 s - - 45 → 65Hz
RS Stock No. 806-5910
Mfr. Part No.1SVR730660R0100
BrandABB
SGD520.25
Each
units
Insulation - SPDT - - 0 → 250 V ac, 0 → 300V dc - - - - - - - -
RS Stock No. 876-2554
Mfr. Part No.CM-UFD.M22
BrandABB
SGD1,293.31
Each
units
Frequency, Voltage - SPDT Overvoltage, Undervoltage 1, 3 - - - - - ±20ms - - 40 → 60Hz
RS Stock No. 442-9449
Mfr. Part No.1SVR550871R9500
BrandABB
SGD133.67
Each
units
Phase, Voltage - SPST Overvoltage, Undervoltage 1, 3 320 → 460V ac - - - Phase Failure 500ms - - -
RS Stock No. 775-7885
Mfr. Part No.1SVR730774R3300
BrandABB
SGD349.30
Each
units
Phase - DPDT - 3 - - - - Phase Failure, Phase Imbalance, Phase Sequence 0s, 0.1 → 30 s - - -
RS Stock No. 876-4995
Mfr. Part No.1SVR730700R2100
BrandABB
SGD127.63
Each
units
Temperature - SPDT - 1 - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 876-4985
Mfr. Part No.1SVR730720R1400
BrandABB
SGD175.14
Each
units
Temperature - SPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 876-5036
Mfr. Part No.1SVR730712R0200
BrandABB
SGD146.19
Each
units
Temperature - DPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 876-5023
Mfr. Part No.1SVR730712R1400
BrandABB
SGD248.20
Each
units
Temperature - SPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 775-7902
Mfr. Part No.1SVR730884R3300
BrandABB
SGD374.81
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 300 → 500V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0s, 0.1 → 30 s - - 45 → 65Hz
RS Stock No. 775-7974
Mfr. Part No.1SVR730840R0400
BrandABB
SGD341.50
Each
units
Current - DPDT - 1 - Overcurrent, Undercurrent 0.1 A, 3 mA, 10mA 1 A, 30 mA, 100mA - 0 s, 0.1 → 30s - - 50 → 60Hz
RS Stock No. 775-8015
Mfr. Part No.1SVR730841R1400
BrandABB
SGD302.40
Each
units
Current - DPDT - 1 - Overcurrent, Undercurrent 0.1 A, 3 mA, 10mA 1 A, 30 mA, 100mA - 0 s, 0.1 → 30s - - 50 → 60Hz
RS Stock No. 876-5011
Mfr. Part No.1SVR730700R2200
BrandABB
SGD137.30
Each
units
Temperature - DPDT - 1 - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 775-7924
Mfr. Part No.1SVR750488R8300
BrandABB
SGD509.02
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 450 → 720V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0s, 0.1 → 30 s - - 45 → 65Hz
RS Stock No. 876-5045
Mfr. Part No.1SVR730712R1200
BrandABB
SGD232.79
Each
units
Temperature - DPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 806-5917
Mfr. Part No.1SVR750660R0200
BrandABB
SGD1,022.84
Each
units
Insulation - DPDT - - 0 → 400 V ac, 0 → 600V dc - - - - - - - -
RS Stock No. 442-9411
Mfr. Part No.1SVR550824R9100
BrandABB
SGD104.18
Each
units
Phase - SPDT - 3 - - - - Phase Failure, Phase Sequence 500ms - - -
RS Stock No. 876-5051
Mfr. Part No.1SVR740712R1300
BrandABB
SGD295.25
Each
units
Temperature - DPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 775-7942
Mfr. Part No.1SVR730760R0500
BrandABB
SGD383.31
Each
units
Current - DPDT - 1 - Overcurrent, Undercurrent 0.3 A, 1 A, 3A 1.5 A, 5 A, 15A - 0 s, 0.1 → 30s - - -