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
PHP5,911.23
Each
units
Phase 200 → 500 V ac DPDT - 3 - - - - Phase Failure, Phase Sequence 500 ms - - 45 → 65 Hz
RS Stock No. 876-4995
Mfr. Part No.1SVR730700R2100
BrandABB
PHP4,608.32
Each
units
Temperature 110 → 130 V ac, 220 → 240 V ac SPDT - 1 - - - - - <100 ms Overtemperature, Winding Temperature - -
RS Stock No. 775-7895
Mfr. Part No.1SVR730794R3300
BrandABB
PHP13,899.07
Each
units
Phase, Voltage 300 → 500 V ac DPDT Overvoltage, Undervoltage 3 300 → 500 V ac - - - Phase Failure, Phase Sequence 0.1 → 30 s, 0 s - - 45 → 65 Hz
RS Stock No. 775-7983
Mfr. Part No.1SVR730840R0500
BrandABB
PHP12,200.64
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. 775-7902
Mfr. Part No.1SVR730884R3300
BrandABB
PHP14,139.16
Each
units
Phase, Voltage 300 → 500 V ac DPDT Overvoltage, Undervoltage 3 300 → 500 V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 30 s, 0 s - - 45 → 65 Hz
RS Stock No. 442-9427
Mfr. Part No.1SVR550870R9400
BrandABB
PHP4,842.76
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. 775-7885
Mfr. Part No.1SVR730774R3300
BrandABB
PHP13,177.21
Each
units
Phase 300 → 500 V ac DPDT - 3 - - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 30 s, 0 s - - -
RS Stock No. 442-9449
Mfr. Part No.1SVR550871R9500
BrandABB
PHP4,000.05
Each
units
Phase, Voltage 320 → 460 V ac SPST Overvoltage, Undervoltage 1, 3 320 → 460 V ac - - - Phase Failure 500 ms - - -
RS Stock No. 806-5910
Mfr. Part No.1SVR730660R0100
BrandABB
PHP18,620.99
Each
units
Insulation 24 → 240 V ac/dc SPDT - - 0 → 250 V ac, 0 → 300 V dc - - - - - - - -
RS Stock No. 775-7968
Mfr. Part No.1SVR730831R1400
BrandABB
PHP11,698.04
Each
units
Voltage 220 → 240 V ac DPDT Overvoltage, Undervoltage 1 3 → 30 V, 30 → 300 V, 6 → 60 V, 60 → 600 V - - - - 0 s, 0.1 → 30 s - - -
RS Stock No. 775-7920
Mfr. Part No.1SVR750487R8300
BrandABB
PHP16,122.19
Each
units
Phase, Voltage 350 → 580 V ac DPDT Overvoltage, Undervoltage 3 350 → 580 V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 30 s, 0 s - - 45 → 65 Hz
RS Stock No. 876-5008
Mfr. Part No.1SVR740700R2100
BrandABB
PHP4,746.89
Each
units
Temperature 110 → 130 V ac, 220 → 240 V ac SPDT - 1 - - - - - <100 ms Overtemperature, Winding Temperature - -
RS Stock No. 775-7955
Mfr. Part No.1SVR730830R0400
BrandABB
PHP13,704.91
Each
units
Voltage 24 → 240 V ac/dc DPDT Overvoltage, Undervoltage 1 3 → 30 V, 30 → 300 V, 6 → 60 V, 60 → 600 V - - - - 0 s, 0.1 → 30 s - - -
RS Stock No. 775-7942
Mfr. Part No.1SVR730760R0500
BrandABB
PHP14,840.07
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. 876-5758
Mfr. Part No.CM-TCS.11S
BrandABB
PHP15,464.45
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. 775-8012
Mfr. Part No.1SVR740774R3300
BrandABB
PHP11,539.32
Each
units
Phase 300 → 500 V ac DPDT - 3 - - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 30 s, 0 s - - -
RS Stock No. 806-5935
Mfr. Part No.1SVR740660R0100
BrandABB
PHP19,197.83
Each
units
Insulation 24 → 240 V ac/dc DPDT - - 0 → 250 V ac, 0 → 300 V dc - - - - - - - -
RS Stock No. 775-7911
Mfr. Part No.1SVR730884R4300
BrandABB
PHP16,871.12
Each
units
Phase, Voltage 300 → 500 V ac DPDT Overvoltage, Undervoltage 3 300 → 500 V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 30 s, 0 s - - 45 → 440 Hz
RS Stock No. 775-7977
Mfr. Part No.1SVR730840R0200
BrandABB
PHP12,571.36
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. 775-7949
Mfr. Part No.1SVR730760R0400
BrandABB
PHP12,575.16
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 - - -