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. 775-7974
Mfr. Part No.1SVR730840R0400
BrandABB
HK$2,000.26
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. 775-7902
Mfr. Part No.1SVR730884R3300
BrandABB
HK$2,322.66
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. 775-7942
Mfr. Part No.1SVR730760R0500
BrandABB
HK$2,283.15
Each
units
Current - DPDT - 1 - Overcurrent, Undercurrent 0.3 A, 1 A, 3A 1.5 A, 5 A, 15A - 0 s, 0.1 → 30s - - -
RS Stock No. 775-7970
Mfr. Part No.1SVR730840R0300
BrandABB
HK$1,940.91
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent 0.3 A, 1 A, 3A 1.5 A, 5 A, 15A - - - - -
RS Stock No. 876-4985
Mfr. Part No.1SVR730720R1400
BrandABB
HK$1,080.25
Each
units
Temperature - SPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 775-7914
Mfr. Part No.1SVR730885R1300
BrandABB
HK$2,346.51
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 90 → 170V ac - - - NEUTRAL, Phase Failure, Phase Imbalance, Phase Sequence 0s, 0.1 → 30 s - - 45 → 65Hz
RS Stock No. 775-7920
Mfr. Part No.1SVR750487R8300
BrandABB
HK$2,494.18
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. 775-8015
Mfr. Part No.1SVR730841R1400
BrandABB
HK$1,801.22
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. 775-7977
Mfr. Part No.1SVR730840R0200
BrandABB
HK$1,894.26
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent 0.1 A, 3 mA, 10mA 1 A, 30 mA, 100mA - - - - -
RS Stock No. 775-7983
Mfr. Part No.1SVR730840R0500
BrandABB
HK$2,043.38
Each
units
Current - DPDT - 1 - Overcurrent, Undercurrent 0.3 A, 1 A, 3A 1.5 A, 5 A, 15A - 0 s, 0.1 → 30s - - 50 → 60Hz
RS Stock No. 775-8037
Mfr. Part No.1SVR740840R0400
BrandABB
HK$1,998.71
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. 775-7911
Mfr. Part No.1SVR730884R4300
BrandABB
HK$2,663.79
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 300 → 500V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0s, 0.1 → 30 s - - 45 → 440Hz
RS Stock No. 775-7949
Mfr. Part No.1SVR730760R0400
BrandABB
HK$2,283.15
Each
units
Current - DPDT - 1 - Overcurrent, Undercurrent 0.1 A, 3 mA, 10mA 1 A, 30 mA, 100mA - 0 s, 0.1 → 30s - - -
RS Stock No. 442-9001
Mfr. Part No.1SVR550882R9500
BrandABB
HK$726.04
Each
units
Phase - SPST - 1, 3 - - - - Phase Failure 150ms - - -
RS Stock No. 775-7918
Mfr. Part No.1SVR730885R3300
BrandABB
HK$2,436.34
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. 775-7936
Mfr. Part No.1SVR730824R9300
BrandABB
HK$1,002.77
Each
units
Phase - DPDT - 3 - - - - Phase Failure, Phase Sequence 500ms - - 45 → 65Hz
RS Stock No. 876-5770
Mfr. Part No.CM-TCS.21S
BrandABB
HK$1,890.57
Each
units
Temperature - SPDT - 3 - - - - - 20ms Overtemperature, Temperature Window Monitoring, Undertemperature -50 → +50°C 45 → 65Hz
RS Stock No. 876-4991
Mfr. Part No.1SVR740700R0100
BrandABB
HK$736.23
Each
units
Temperature - SPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 775-7924
Mfr. Part No.1SVR750488R8300
BrandABB
HK$3,031.96
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. 876-5033
Mfr. Part No.1SVR730712R2200
BrandABB
HK$866.12
Each
units
Temperature - DPDT - 1 - - - - - <100ms Overtemperature, Winding Temperature - -