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
TWD3,734.00
Each
units
Phase - DPDT - 3 - - - - Phase Failure, Phase Sequence 500ms - - 45 → 65Hz
RS Stock No. 876-5027
Mfr. Part No.1SVR740712R1400
BrandABB
TWD5,567.00
Each
units
Temperature - SPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 442-9411
Mfr. Part No.1SVR550824R9100
BrandABB
TWD1,906.00
Each
units
Phase - SPDT - 3 - - - - Phase Failure, Phase Sequence 500ms - - -
RS Stock No. 464-508
Mfr. Part No.1SVR550800R9300
BrandABB
TWD2,327.00
Each
units
Temperature - SPST - 1 - - - - - - Overtemperature, Undertemperature - -
RS Stock No. 876-5033
Mfr. Part No.1SVR730712R2200
BrandABB
TWD3,236.00
Each
units
Temperature - DPDT - 1 - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 876-5014
Mfr. Part No.1SVR730700R0200
BrandABB
TWD3,057.00
Each
units
Temperature - DPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 876-5752
Mfr. Part No.CM-TCS.11P
BrandABB
TWD9,206.00
Each
units
Temperature - SPDT - 3 - - - - - 20ms Overtemperature, Temperature Window Monitoring, Undertemperature -50 → +50°C 13.5 → 440Hz
RS Stock No. 442-9405
Mfr. Part No.1SVR550801R9300
BrandABB
TWD1,888.00
Each
units
Temperature - SPST - 1 - - - - - <100ms Overtemperature, Undertemperature - -
RS Stock No. 775-7920
Mfr. Part No.1SVR750487R8300
BrandABB
TWD9,604.00
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 350 → 580V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0s, 0.1 → 30 s - - 45 → 65Hz
RS Stock No. 775-7970
Mfr. Part No.1SVR730840R0300
BrandABB
TWD7,105.00
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent 0.3 A, 1 A, 3A 1.5 A, 5 A, 15A - - - - -
RS Stock No. 442-9001
Mfr. Part No.1SVR550882R9500
BrandABB
TWD2,658.00
Each
units
Phase - SPST - 1, 3 - - - - Phase Failure 150ms - - -
RS Stock No. 775-7885
Mfr. Part No.1SVR730774R3300
BrandABB
TWD7,616.00
Each
units
Phase - DPDT - 3 - - - - Phase Failure, Phase Imbalance, Phase Sequence 0s, 0.1 → 30 s - - -
RS Stock No. 806-5932
Mfr. Part No.1SVR750669R9400
BrandABB
TWD12,619.00
Each
units
Insulation - - - - 0 → 1000 V dc, 0 → 690V ac - - - - - - - -
RS Stock No. 876-5017
Mfr. Part No.1SVR740700R0200
BrandABB
TWD2,969.00
Each
units
Temperature - DPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 876-5770
Mfr. Part No.CM-TCS.21S
BrandABB
TWD7,251.00
Each
units
Temperature - SPDT - 3 - - - - - 20ms Overtemperature, Temperature Window Monitoring, Undertemperature -50 → +50°C 45 → 65Hz
RS Stock No. 876-5045
Mfr. Part No.1SVR730712R1200
BrandABB
TWD5,725.00
Each
units
Temperature - DPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 775-7889
Mfr. Part No.1SVR730784R2300
BrandABB
TWD6,497.00
Each
units
Phase, Voltage - DPDT - 3 342 → 418V ac - - - Phase Failure, Phase Sequence 0s, 0.1 → 30 s - - 45 → 65Hz
RS Stock No. 876-4985
Mfr. Part No.1SVR730720R1400
BrandABB
TWD4,270.00
Each
units
Temperature - SPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 876-5020
Mfr. Part No.1SVR740700R2200
BrandABB
TWD3,192.00
Each
units
Temperature - DPDT - 1 - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 775-7949
Mfr. Part No.1SVR730760R0400
BrandABB
TWD8,358.00
Each
units
Current - DPDT - 1 - Overcurrent, Undercurrent 0.1 A, 3 mA, 10mA 1 A, 30 mA, 100mA - 0 s, 0.1 → 30s - - -