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. 890-3887
Mfr. Part No.2905597
$187.78
Each
units
Voltage 177 → 794 V ac DPDT Undervoltage 3 - - - - Phase Failure, Phase Sequence - - - 48 → 63 Hz
RS Stock No. 801-6218
Mfr. Part No.2866022
$337.50
Each
units
Current 24 → 240 V ac/dc DPDT - 1 - Overcurrent, Undercurrent 0A 0.1 A, 1 A, 10 A - 0.1 → 10 s - - -
RS Stock No. 890-3875
Mfr. Part No.2902035
$261.04
Each
units
Current, Voltage 9.6 → 30 V dc SPDT - - 0 → 12 V Overcurrent 0mA 24mA - - - - -
RS Stock No. 801-6224
Mfr. Part No.2866035
$274.07
Each
units
Voltage 24 V dc, 24 → 230 V ac SPDT Undervoltage 1 0 → 300 V ac/dc - - - - 0.2 → 10 s - - -
RS Stock No. 890-3884
Mfr. Part No.2902065
$214.34
Each
units
Current, Voltage 9.6 → 30 V dc - - - 1.25 → 10 V dc Overcurrent 2.5mA 20mA - - - - -
RS Stock No. 715-7986
Mfr. Part No.2900177
$472.25
Each
units
Current, Temperature, Voltage 110 → 500 V ac DPDT Overvoltage, Undervoltage 1, 3 0 → 480 V ac Overcurrent, Undercurrent 0.15A 12A - 0.1 → 50 s Overtemperature, Undertemperature - -
RS Stock No. 181-2035
Mfr. Part No.2903591
$280.88
Each
units
Voltage 24 V dc - - - 2 → 10 V dc - - - - - - - -
RS Stock No. 181-2032
Mfr. Part No.2901674
$285.99
Each
units
- 24 V dc - - - - - - - - - - - -
RS Stock No. 181-2033
Mfr. Part No.2903242
$330.50
Each
units
Current - - - - - - 0A 20A - - - - -
RS Stock No. 171-7045
Mfr. Part No.2906252
$92.43
Each
units
Temperature 230 V ac SPDT - - - - - - - - Winding Temperature - -
RS Stock No. 181-2031
Mfr. Part No.2903241
$417.75
Each
units
Current Via SCK-C-MODBUS - - - - - 0A 20A - - - - -
RS Stock No. 181-2030
Mfr. Part No.2963598
$234.38
Each
units
- 24 V dc - - - 19.2 → 28.8 V dc - - - - - - - -