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. 518-7174
Mfr. Part No.3UG4615-1CR20
BrandSiemens
SGD410.87
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
SGD230.22
Each
units
Phase - DPDT - 3 - - - - Phase Failure, Phase Sequence 500ms - - 45 → 65Hz
RS Stock No. 857-7700
Mfr. Part No.DPC01DM69
SGD666.91
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
SGD192.87
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
SGD187.03
Each
units
Phase - DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100ms - - -
RS Stock No. 776-1581
Mfr. Part No.72.01.8.240.0000
BrandFinder
SGD132.21
Each
units
Level - SPDT - 1 - - - - - 0.5 → 7s - - -
RS Stock No. 240-8939
Mfr. Part No.BA9043 3AC50-400Hz 230/400V
BrandDold
SGD366.82
Each
units
Voltage - DPDT Undervoltage - - - - - - - - - -
RS Stock No. 518-7297
Mfr. Part No.3UG4513-1BR20
BrandSiemens
SGD209.35
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
SGD209.91
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
SGD132.73
Each
units
Level - DPDT - 1 - - - - - 0.1 → 5s - - -
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. 775-7895
Mfr. Part No.1SVR730794R3300 CM-PVS.41S
BrandABB
SGD389.81
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 300 → 500V ac - - - Phase Failure, Phase Sequence 0s, 0.1 → 30 s - - 45 → 65Hz
RS Stock No. 857-7182
Mfr. Part No.DIB01CB235A
SGD359.62
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent - - - 1 s, 6s - - -
RS Stock No. 463-3654
Mfr. Part No.84871034
BrandCrouzet
SGD264.54
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent 0.1A 10A - 0.1 → 3s - - -
RS Stock No. 806-5910
Mfr. Part No.1SVR730660R0100 CM-IWS.1S
BrandABB
SGD530.59
Each
units
Insulation - SPDT - - 0 → 250 V ac, 0 → 300V dc - - - - - - - -
RS Stock No. 397-9202
Mfr. Part No.45PUVR-4W 400VAC
SGD159.36
Each
units
Phase, Voltage - DPDT Undervoltage 3 Maximum of 400V ac - - - Neutral Loss, Phase Loss 200ms - - -
RS Stock No. 850-5411
Mfr. Part No.LBVR/A 12-24VDC
SGD83.77
Each
units
Voltage - SPDT Undervoltage - 12 → 24V dc - - - - 0 → 30s - - -
RS Stock No. 876-2554
Mfr. Part No.1SVR560730R3400 CM-UFD.M22
BrandABB
SGD1,318.71
Each
units
Frequency, Voltage - SPDT Overvoltage, Undervoltage 1, 3 - - - - - ±20ms - - 40 → 60Hz
RS Stock No. 240-8945
Mfr. Part No.BA9043/001 3AC50-400Hz 400V
BrandDold
SGD586.31
Each
units
Voltage - DPDT Undervoltage 3 - - - - - - - - -