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. 715-7986
Mfr. Part No.2900177
SGD478.54
Each
units
Current, Temperature, Voltage - DPDT Overvoltage, Undervoltage 1, 3 0 → 480V ac Overcurrent, Undercurrent 0.15A 12A - 0.1 → 50s Overtemperature, Undertemperature - -
RS Stock No. 801-6236
Mfr. Part No.2866051
SGD271.33
Each
units
Voltage - SPDT Window, Without Neutral Conductor Connection 3 280 → 520V ac - - - - 0.2 → 10s - - -
RS Stock No. 181-2035
Mfr. Part No.2903591
SGD255.17
Each
units
Voltage - - - - 2 → 10V dc - - - - - - - -
RS Stock No. 801-6220
Mfr. Part No.2866048
SGD405.66
Each
units
Voltage - DPDT Overvoltage, Undervoltage 1 0 → 300V ac/dc - - - - 0.1 → 10s - - -
RS Stock No. 181-2030
Mfr. Part No.2963598
SGD243.58
Each
units
- - - - - 19.2 → 28.8V dc - - - - - - - -
RS Stock No. 181-2032
Mfr. Part No.2901674
SGD299.25
Each
units
- - - - - - - - - - - - - -
RS Stock No. 890-3887
Mfr. Part No.2905597
SGD192.63
Each
units
Voltage - DPDT Undervoltage 3 - - - - Phase Failure, Phase Sequence - - - 48 → 63Hz
RS Stock No. 801-6227
Mfr. Part No.2866019
SGD294.36
Each
units
Current - SPDT - 1 - Overcurrent 0A 0.1 A, 1 A, 10A - 0.2 → 10s - - -
RS Stock No. 801-6218
Mfr. Part No.2866022
SGD405.66
Each
units
Current - DPDT - 1 - Overcurrent, Undercurrent 0A 0.1 A, 1 A, 10A - 0.1 → 10s - - -
RS Stock No. 890-3884
Mfr. Part No.2902065
SGD219.89
Each
units
Current, Voltage - - - - 1.25 → 10V dc Overcurrent 2.5mA 20mA - - - - -
RS Stock No. 171-7045
Mfr. Part No.2906252
SGD95.76
Each
units
Temperature - SPDT - - - - - - - - Winding Temperature - -
RS Stock No. 181-2031
Mfr. Part No.2903241
SGD437.90
Each
units
Current - - - - - - 0A 20A - - - - -
RS Stock No. 801-6224
Mfr. Part No.2866035
SGD281.17
Each
units
Voltage - SPDT Undervoltage 1 0 → 300V ac/dc - - - - 0.2 → 10s - - -
RS Stock No. 181-2033
Mfr. Part No.2903242
SGD357.04
Each
units
Current - - - - - - 0A 20A - - - - -
RS Stock No. 801-6233
Mfr. Part No.2866064
SGD393.48
Each
units
Phase, Voltage - DPDT Undervoltage, Window 3 280 → 520V ac - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 890-3875
Mfr. Part No.2902035
SGD322.07
Each
units
Current, Voltage - SPDT - - - Overcurrent 0mA 24mA - - - - -