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. 775-7902
Mfr. Part No.1SVR730884R3300
BrandABB
HK$2,118.19
Each
units
Phase, Voltage 300 → 500 V ac DPDT Overvoltage, Undervoltage 3 300 → 500 V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0 s, 0.1 → 30 s - - 45 → 65 Hz
RS Stock No. 775-7974
Mfr. Part No.1SVR730840R0400
BrandABB
HK$2,043.04
Each
units
Current 24 → 240 V ac/dc DPDT - 1 - Overcurrent, Undercurrent 0.1 A, 3 mA, 10 mA 1 A, 30 mA, 100 mA - 0 s, 0.1 → 30 s - - 50 → 60 Hz
RS Stock No. 775-7942
Mfr. Part No.1SVR730760R0500
BrandABB
HK$2,155.98
Each
units
Current 24 → 240 V ac/dc DPDT - 1 - Overcurrent, Undercurrent 0.3 A, 1 A, 3 A 1.5 A, 5 A, 15 A - 0 s, 0.1 → 30 s - - -
RS Stock No. 775-7970
Mfr. Part No.1SVR730840R0300
BrandABB
HK$1,832.80
Each
units
Current 24 → 240 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 0.3 A, 1 A, 3 A 1.5 A, 5 A, 15 A - - - - -
RS Stock No. 876-4985
Mfr. Part No.1SVR730720R1400
BrandABB
HK$1,038.52
Each
units
Temperature 24 → 240 V ac/dc SPDT - - - - - - - <100 ms Overtemperature, Winding Temperature - -
RS Stock No. 775-7914
Mfr. Part No.1SVR730885R1300
BrandABB
HK$2,215.81
Each
units
Phase, Voltage 90 → 170 V ac DPDT Overvoltage, Undervoltage 3 90 → 170 V ac - - - NEUTRAL, Phase Failure, Phase Imbalance, Phase Sequence 0 s, 0.1 → 30 s - - 45 → 65 Hz
RS Stock No. 775-7977
Mfr. Part No.1SVR730840R0200
BrandABB
HK$1,832.80
Each
units
Current 24 → 240 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 0.1 A, 3 mA, 10 mA 1 A, 30 mA, 100 mA - - - - -
RS Stock No. 775-7983
Mfr. Part No.1SVR730840R0500
BrandABB
HK$1,908.86
Each
units
Current 24 → 240 V ac/dc DPDT - 1 - Overcurrent, Undercurrent 0.3 A, 1 A, 3 A 1.5 A, 5 A, 15 A - 0 s, 0.1 → 30 s - - 50 → 60 Hz
RS Stock No. 775-8015
Mfr. Part No.1SVR730841R1400
BrandABB
HK$1,700.90
Each
units
Current 220 → 240 V ac DPDT - 1 - Overcurrent, Undercurrent 0.1 A, 3 mA, 10 mA 1 A, 30 mA, 100 mA - 0 s, 0.1 → 30 s - - 50 → 60 Hz
RS Stock No. 775-7911
Mfr. Part No.1SVR730884R4300
BrandABB
HK$2,515.43
Each
units
Phase, Voltage 300 → 500 V ac DPDT Overvoltage, Undervoltage 3 300 → 500 V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0 s, 0.1 → 30 s - - 45 → 440 Hz
RS Stock No. 442-9001
Mfr. Part No.1SVR550882R9500
BrandABB
HK$688.86
Each
units
Phase 380 → 440 V ac SPST - 1, 3 - - - - Phase Failure 150 ms - - -
RS Stock No. 775-7920
Mfr. Part No.1SVR750487R8300
BrandABB
HK$2,548.98
Each
units
Phase, Voltage 350 → 580 V ac DPDT Overvoltage, Undervoltage 3 350 → 580 V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0 s, 0.1 → 30 s - - 45 → 65 Hz
RS Stock No. 775-7949
Mfr. Part No.1SVR730760R0400
BrandABB
HK$2,155.98
Each
units
Current 24 → 240 V ac/dc DPDT - 1 - Overcurrent, Undercurrent 0.1 A, 3 mA, 10 mA 1 A, 30 mA, 100 mA - 0 s, 0.1 → 30 s - - -
RS Stock No. 775-8037
Mfr. Part No.1SVR740840R0400
BrandABB
HK$2,048.56
Each
units
Current 24 → 240 V ac/dc DPDT - 1 - Overcurrent, Undercurrent 0.1 A, 3 mA, 10 mA 1 A, 30 mA, 100 mA - 0 s, 0.1 → 30 s - - 50 → 60 Hz
RS Stock No. 876-5799
Mfr. Part No.CM-TCS.23P
BrandABB
HK$1,947.32
Each
units
Temperature 24 V ac/dc SPDT - 3 - - - - - 20 ms Overtemperature, Temperature Window Monitoring, Undertemperature 0 → +200°C 45 → 65 Hz
RS Stock No. 442-9411
Mfr. Part No.1SVR550824R9100
BrandABB
HK$640.91
Each
units
Phase 208 → 440 V ac SPDT - 3 - - - - Phase Failure, Phase Sequence 500 ms - - -
RS Stock No. 876-5758
Mfr. Part No.CM-TCS.11S
BrandABB
HK$2,305.73
Each
units
Temperature 24 → 240 V ac/dc SPDT - 3 - - - - - 20 ms Overtemperature, Temperature Window Monitoring, Undertemperature -50 → +50°C 13.5 → 440 Hz
RS Stock No. 876-5027
Mfr. Part No.1SVR740712R1400
BrandABB
HK$1,354.15
Each
units
Temperature 24 → 240 V ac/dc SPDT - - - - - - - <100 ms Overtemperature, Winding Temperature - -
RS Stock No. 442-9427
Mfr. Part No.1SVR550870R9400
BrandABB
HK$754.47
Each
units
Phase, Voltage 185 → 265 V ac, 320 → 460 V ac SPST Overvoltage, Undervoltage 1, 3 185 → 265 V ac, 320 → 460 V ac - - - NEUTRAL 500 ms - - -
RS Stock No. 876-4989
Mfr. Part No.1SVR740720R1400
BrandABB
HK$1,069.75
Each
units
Temperature 24 → 240 V ac/dc SPDT - - - - - - - <100 ms Overtemperature, Winding Temperature - -