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. 442-9001
Mfr. Part No.1SVR550882R9500
BrandABB
R 996.38
Each
units
Phase 380 → 440 V ac SPST - 1, 3 - - - - Phase Failure 150 ms - - -
RS stock no. 775-7955
Mfr. Part No.1SVR730830R0400
BrandABB
R 3,427.23
Each
units
Voltage 24 → 240 V ac/dc DPDT Overvoltage, Undervoltage 1 3 → 30 V, 6 → 60 V, 30 → 300 V, 60 → 600 V - - - - 0 s, 0.1 → 30 s - - -
RS stock no. 876-2551
Mfr. Part No.1SVR560730R3402
BrandABB
R 12,319.54
Each
units
Frequency, Voltage 24 → 240 V ac/dc SPDT Overvoltage, Undervoltage 1, 3 0 → 317 (2 Wire) V ac, 0 → 317 (4 Wire) V ac, 0 → 550 (3 Wire) V ac - - - - ±20 ms - - 40 → 70 Hz
RS stock no. 775-7936
Mfr. Part No.1SVR730824R9300
BrandABB
R 1,548.81
Each
units
Phase 200 → 500 V ac DPDT - 3 - - - - Phase Failure, Phase Sequence 500 ms - - 45 → 65 Hz
RS stock no. 442-9455
Mfr. Part No.1SVR550881R9400
BrandABB
R 1,070.87
Each
units
Phase 220 → 240 V ac, 380 → 440 V ac SPST - 1, 3 - - - - NEUTRAL 150 ms - - -
RS stock no. 442-9411
Mfr. Part No.1SVR550824R9100
BrandABB
R 1,138.90
Each
units
Phase 208 → 440 V ac SPDT - 3 - - - - Phase Failure, Phase Sequence 500 ms - - -
RS stock no. 775-7974
Mfr. Part No.1SVR730840R0400
BrandABB
R 3,427.74
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. 876-5023
Mfr. Part No.1SVR730712R1400
BrandABB
R 2,193.86
Each
units
Temperature 24 → 240 V ac/dc SPDT - - - - - - - <100 ms Overtemperature, Winding Temperature - -
RS stock no. 442-9449
Mfr. Part No.1SVR550871R9500
BrandABB
R 1,008.38
Each
units
Phase, Voltage 320 → 460 V ac SPST Overvoltage, Undervoltage 1, 3 320 → 460 V ac - - - Phase Failure 500 ms - - -
RS stock no. 775-8034
Mfr. Part No.1SVR740884R3300
BrandABB
R 3,623.19
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. 876-2554
Mfr. Part No.CM-UFD.M22
BrandABB
R 12,248.73
Each
units
Frequency, Voltage 24 → 240 V ac/dc SPDT Overvoltage, Undervoltage 1, 3 0 → 312 (2 Wire) V ac, 0 → 312 (4 Wire) V ac, 0 → 540 (3 Wire) V ac - - - - ±20 ms - - 40 → 60 Hz
RS stock no. 876-4995
Mfr. Part No.1SVR730700R2100
BrandABB
R 1,152.77
Each
units
Temperature 110 → 130 V ac, 220 → 240 V ac SPDT - 1 - - - - - <100 ms Overtemperature, Winding Temperature - -
RS stock no. 876-5014
Mfr. Part No.1SVR730700R0200
BrandABB
R 1,245.04
Each
units
Temperature 24 V ac/dc DPDT - - - - - - - <100 ms Overtemperature, Winding Temperature - -
RS stock no. 775-7911
Mfr. Part No.1SVR730884R4300
BrandABB
R 4,202.89
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. 775-7920
Mfr. Part No.1SVR750487R8300
BrandABB
R 4,787.95
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. 876-5005
Mfr. Part No.1SVR740722R1400
BrandABB
R 1,846.97
Each
units
Temperature 24 → 240 V ac/dc SPDT - - - - - - - <100 ms Overtemperature, Winding Temperature - -
RS stock no. 876-5049
Mfr. Part No.1SVR740712R1200
BrandABB
R 2,391.56
Each
units
Temperature 24 → 240 V ac/dc DPDT - - - - - - - <100 ms Overtemperature, Winding Temperature - -
RS stock no. 775-7882
Mfr. Part No.1SVR730774R1300
BrandABB
R 3,281.67
Each
units
Phase 160 → 300 V ac DPDT - 3 - - - - Phase Failure, Phase Imbalance, Phase Sequence 0 s, 0.1 → 30 s - - -
RS stock no. 775-7970
Mfr. Part No.1SVR730840R0300
BrandABB
R 3,144.12
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. 775-7902
Mfr. Part No.1SVR730884R3300
BrandABB
R 3,523.29
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