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. 102-6137
BrandRS PRO
SGD149.96
Each
units
Phase, Voltage - SPDT Overvoltage, Undervoltage 3 - - - - Phase Failure, Phase Sequence 0.2 → 10s - - 48 → 63Hz
RS Stock No. 102-6130
BrandRS PRO
SGD84.04
Each
units
Voltage - SPDT Undervoltage 1 12 → 24V dc - - - - 0 → 30s - - -
RS Stock No. 102-6133
BrandRS PRO
SGD212.85
Each
units
Voltage - SPDT Overvoltage, Undervoltage 1 - - - - - 0.1 → 30s - - 48 → 63Hz
RS Stock No. 102-6131
BrandRS PRO
SGD95.69
Each
units
Voltage - SPDT Overvoltage, Undervoltage 1 - - - - - 0.2 → 10s - - 48 → 63Hz
RS Stock No. 102-6134
BrandRS PRO
SGD177.91
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent 1A 10A - 0.1 → 30s - - 48 → 63Hz
RS Stock No. 102-6135
BrandRS PRO
SGD86.26
Each
units
Phase, Voltage - SPDT Undervoltage 3 - - - - Phase Failure, Phase Sequence 100ms - - 48 → 63Hz
RS Stock No. 102-6136
BrandRS PRO
SGD90.41
Each
units
Phase, Voltage - SPDT Undervoltage 3 - - - - Phase Failure, Phase Sequence 0.2 → 10s - - 48 → 63Hz
RS Stock No. 859-3285
Mfr. Part No.PPB01CM48
SGD442.37
Each
units
Phase, Voltage - SPDT Overvoltage, Undervoltage 3, 3+N 323 → 475V ac - - - Phase Loss, Phase Sequence 1 s, 6s - - -
RS Stock No. 518-7174
Mfr. Part No.3UG4615-1CR20
BrandSiemens
SGD423.45
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Sequence 0.1 → 20s - - -
RS Stock No. 775-7936
Mfr. Part No.1SVR730824R9300 CM-PFS.S
BrandABB
SGD243.24
Each
units
Phase - DPDT - 3 - - - - Phase Failure, Phase Sequence 500ms - - 45 → 65Hz
RS Stock No. 857-7700
Mfr. Part No.DPC01DM69
SGD710.26
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. 146-159
Mfr. Part No.RM17UAS16
SGD201.71
Each
units
Voltage - SPDT Overvoltage, Self Powered, Undervoltage 1 20 → 80V ac/dc - - - - 0.1 → 10s - - -
RS Stock No. 146-238
Mfr. Part No.RM17TG20
SGD198.92
Each
units
Phase - DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100ms - - -
RS Stock No. 240-8939
Mfr. Part No.BA9043 3AC50-400Hz 230/400V
BrandDold
SGD370.33
Each
units
Voltage - DPDT Undervoltage - - - - - - - - - -
RS Stock No. 776-1581
Mfr. Part No.72.01.8.240.0000
BrandFinder
SGD145.94
Each
units
Level - SPDT - 1 - - - - - 0.5 → 7s - - -
RS Stock No. 518-7297
Mfr. Part No.3UG4513-1BR20
BrandSiemens
SGD231.62
Each
units
Phase, Voltage - DPDT Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20s - - -
RS Stock No. 146-531
Mfr. Part No.RM17UBE16
SGD227.39
Each
units
Voltage - SPDT Overvoltage, Self Powered, Undervoltage 1 20 → 80V ac/dc - - - - 0.1 → 10s - - -
RS Stock No. 124-0193
Mfr. Part No.RM35LM33MW
SGD145.56
Each
units
Level - DPDT - 1 - - - - - 0.1 → 5s - - -
RS Stock No. 857-7662
Mfr. Part No.DPA51CM44
SGD352.75
Each
units
Phase - SPDT - 3 177 → 550V ac - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 857-7182
Mfr. Part No.DIB01CB235A
SGD386.93
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent - - - 1 s, 6s - - -