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. 859-3285
Mfr. Part No.PPB01CM48
SGD365.24
Each
units
Phase, Voltage - SPDT Overvoltage, Undervoltage 3, 3+N 323 → 475V ac - - - Phase Loss, Phase Sequence 1 s, 6s - - -
RS Stock No. 857-7700
Mfr. Part No.DPC01DM69
SGD667.11
Each
units
Phase, Voltage - SPDT Overvoltage, Undervoltage 3, 3+N 510 → 793V ac - - - Asymmetry, Phase Loss, Phase Sequence, Tolerance 1 s, 6s - - 50 → 60Hz
RS Stock No. 857-7662
Mfr. Part No.DPA51CM44
SGD281.33
Each
units
Phase - SPDT - 3 177 → 550V ac - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 857-7182
Mfr. Part No.DIB01CB235A
SGD363.38
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent - - - 1 s, 6s - - -
RS Stock No. 857-7680
Mfr. Part No.DPA01CM44
SGD290.13
Each
units
Phase, Voltage - SPDT - 3 177 → 550V ac - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 857-7696
Mfr. Part No.DPB01CM48
SGD493.49
Each
units
Phase, Voltage - SPDT Overvoltage, Undervoltage 3, 3+N 323 → 550V ac - - - Phase Loss, Phase Sequence 1 s, 6s - - -
RS Stock No. 859-3027
Mfr. Part No.DUA52C724
SGD234.36
Each
units
Voltage - SPDT Undervoltage - 8 → 28V dc - - - - <200ms - - -
RS Stock No. 857-7416
Mfr. Part No.PPA01CM44
SGD231.37
Each
units
Phase, Voltage - SPDT - 3 177 → 475V ac - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 727-1256
Mfr. Part No.PUA01CB23500V
SGD171.85
Each
units
Current, Voltage - SPDT Overvoltage - 0.4 → 500 V ac, 2 → 500V dc Overcurrent - - - <300ms - - -
RS Stock No. 857-7179
Mfr. Part No.DUB01CB23500V
SGD363.38
Each
units
Voltage - SPDT Overvoltage, Undervoltage 1 2 → 500V ac/dc - - - - 1 s, 6s - - -
RS Stock No. 857-7905
Mfr. Part No.DUB01CD48500V
SGD310.16
Each
units
Voltage - SPDT Overvoltage, Undervoltage 1 2 → 500V ac/dc - - - - 1 s, 6s - - -
RS Stock No. 857-7075
Mfr. Part No.DIA53S72420A
SGD79.22
Each
units
Current - SPST - 1 - Overcurrent - - - <300ms - - -
RS Stock No. 857-7072
Mfr. Part No.DIA53S72450A
SGD276.59
Each
units
Current - SPST - 1 - Overcurrent - - - <300ms - - -
RS Stock No. 857-7426
Mfr. Part No.DPC01DM48
SGD580.98
Each
units
Phase, Voltage - SPDT Overvoltage, Undervoltage 3, 3+N 323 → 550V ac - - - Asymmetry, Phase Loss, Phase Sequence, Tolerance 1 s, 6s - - 50 → 60Hz
RS Stock No. 859-3077
Mfr. Part No.DFB01CM24
SGD538.13
Each
units
- - - - - - - - - - - - - -
RS Stock No. 857-7167
Mfr. Part No.DUA01CB23500V
SGD245.85
Each
units
Current, Voltage - SPDT Overvoltage 1 0.4 → 4 V ac, 2 → 20 V ac/dc, 5 → 50 V ac/dc, 20 → 200 V ac/dc, 50 → 500V ac/dc Overcurrent - - - - - - -
RS Stock No. 857-7185
Mfr. Part No.PIB02CB23150MV
SGD319.99
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent - - - 1 s, 6s - - -
RS Stock No. 201-0819
Mfr. Part No.DIA01CB235A
SGD200.73
Each
units
Current - SPDT - 1 - - - - - - - - -
RS Stock No. 209-8601
Mfr. Part No.PPB01CM44
SGD249.95
Each
units
Voltage - SPDT - 3 - - - - - - - - -
RS Stock No. 857-7703
Mfr. Part No.DIB01CM24100A
SGD571.26
Each
units
Current - SPDT - 1 - Overcurrent - - - 1 s, 6s - - -