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. 775-7889
Mfr. Part No.1SVR730784R2300
BrandABB
$252.81
Each
units
Phase, Voltage 380 V ac DPDT - 3 342 → 418 V ac - - - Phase Failure, Phase Sequence 0 s, 0.1 → 30 s - - 45 → 65 Hz
RS Stock No. 806-5910
Mfr. Part No.1SVR730660R0100
BrandABB
$492.80
Each
units
Insulation 24 → 240 V ac/dc SPDT - - 0 → 250 V ac, 0 → 300 V dc - - - - - - - -
RS Stock No. 775-7936
Mfr. Part No.1SVR730824R9300
BrandABB
$172.51
Each
units
Phase 200 → 500 V ac DPDT - 3 - - - - Phase Failure, Phase Sequence 500 ms - - 45 → 65 Hz
RS Stock No. 775-7992
Mfr. Part No.1SVR730841R0300
BrandABB
$279.86
Each
units
Current 110 → 130 V ac SPDT - 1 - Overcurrent, Undercurrent 0.3 A, 1 A, 3 A 1.5 A, 5 A, 15 A - - - - -
RS Stock No. 876-5008
Mfr. Part No.1SVR740700R2100
BrandABB
$125.25
Each
units
Temperature 110 → 130 V ac, 220 → 240 V ac SPDT - 1 - - - - - <100 ms Overtemperature, Winding Temperature - -
RS Stock No. 775-7902
Mfr. Part No.1SVR730884R3300
BrandABB
$418.32
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. 775-7955
Mfr. Part No.1SVR730830R0400
BrandABB
$366.90
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. 442-9449
Mfr. Part No.1SVR550871R9500
BrandABB
$110.37
Each
units
Phase, Voltage 320 → 460 V ac SPST Overvoltage, Undervoltage 1, 3 320 → 460 V ac - - - Phase Failure 500 ms - - -
RS Stock No. 775-7996
Mfr. Part No.1SVR730841R0400
BrandABB
$279.86
Each
units
Current 110 → 130 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. 876-5014
Mfr. Part No.1SVR730700R0200
BrandABB
$125.35
Each
units
Temperature 24 V ac/dc DPDT - - - - - - - <100 ms Overtemperature, Winding Temperature - -
RS Stock No. 876-5020
Mfr. Part No.1SVR740700R2200
BrandABB
$94.91
Each
units
Temperature 110 → 130 V ac, 220 → 240 V ac DPDT - 1 - - - - - <100 ms Overtemperature, Winding Temperature - -
RS Stock No. 442-9455
Mfr. Part No.1SVR550881R9400
BrandABB
$100.10
Each
units
Phase 220 → 240 V ac, 380 → 440 V ac SPST - 1, 3 - - - - NEUTRAL 150 ms - - -
RS Stock No. 775-7958
Mfr. Part No.1SVR730830R0500
BrandABB
$443.79
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. 464-508
Mfr. Part No.1SVR550800R9300
BrandABB
$83.19
Each
units
Temperature 110 → 130 V ac SPST - 1 - - - - - - Overtemperature, Undertemperature - -
RS Stock No. 806-5917
Mfr. Part No.1SVR750660R0200
BrandABB
$839.40
Each
units
Insulation 24 → 240 V ac/dc DPDT - - 0 → 400 V ac, 0 → 600 V dc - - - - - - - -
RS Stock No. 775-7914
Mfr. Part No.1SVR730885R1300
BrandABB
$412.56
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. 806-5957
Mfr. Part No.1SVR760669R9400
BrandABB
$470.01
Each
units
Insulation - - - - 0 → 1000 V dc, 0 → 690 V ac - - - - - - - -
RS Stock No. 876-5011
Mfr. Part No.1SVR730700R2200
BrandABB
$103.82
Each
units
Temperature 110 → 130 V ac, 220 → 240 V ac DPDT - 1 - - - - - <100 ms Overtemperature, Winding Temperature - -
RS Stock No. 775-7946
Mfr. Part No.1SVR730830R0300
BrandABB
$300.68
Each
units
Voltage 24 → 240 V ac/dc SPDT Overvoltage, Undervoltage 1 3 → 30 V, 6 → 60 V, 30 → 300 V, 60 → 600 V - - - - - - - -
RS Stock No. 442-9411
Mfr. Part No.1SVR550824R9100
BrandABB
$131.10
Each
units
Phase 208 → 440 V ac SPDT - 3 - - - - Phase Failure, Phase Sequence 500 ms - - -