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 and 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. 102-6130
BrandRS PRO
kr 633,04
Each
Units
Voltage - SPDT Undervoltage 1 12 → 24V dc - - - - 0 → 30s - - -
RS Stock No. 102-6134
BrandRS PRO
kr 1 225,97
Each
Units
Current - SPDT - 1 - Overcurrent, Undercurrent 1A 10A - 0.1 → 30s - - 48 → 63Hz
RS Stock No. 223-7794
BrandRS PRO
kr 1 014,63
Each
Units
Phase - SPDT Overvoltage Protection, Undervoltage Protection 3 - - - - - - - - -
RS Stock No. 102-6131
BrandRS PRO
kr 693,60
Each
Units
Voltage - SPDT Overvoltage, Undervoltage 1 - - - - - 0.2 → 10s - - 48 → 63Hz
RS Stock No. 223-7795
BrandRS PRO
kr 761,11
Each
Units
Phase - SPDT Overvoltage Protection, Undervoltage Protection 3 - - - - - - - - -
RS Stock No. 223-7790
BrandRS PRO
kr 1 278,69
Each
Units
Phase Voltage - 2CO Overvoltage Protection, Undervoltage Protection 3 - - - - - 2 → 999s - - -
RS Stock No. 102-6136
BrandRS PRO
kr 696,31
Each
Units
Phase, Voltage - SPDT Undervoltage 3 - - - - Phase Failure, Phase Sequence 0.2 → 10s - - 48 → 63Hz
RS Stock No. 223-7791
BrandRS PRO
kr 840,36
Each
Units
Phase - SPDT Overvoltage Protection, Undervoltage Protection 3 - - - - - - - - -
RS Stock No. 223-7788
BrandRS PRO
kr 1 107,90
Each
Units
Phase, Voltage - 1CO Overvoltage Protection, Undervoltage Protection 3 - - - - - 2 → 999s - - -
RS Stock No. 102-6135
BrandRS PRO
kr 664,79
Each
Units
Phase, Voltage - SPDT Undervoltage 3 Maximum of 280 V - - - Phase Failure, Phase Sequence 100ms - - 48 → 63Hz
RS Stock No. 225-7388
BrandRS PRO
kr 830,25
Each
Units
Phase, Voltage - DPDT Undervoltage 3 243 → 540 V - - - Phase Failure, Phase Sequence 0.2 → 10s - - -
RS Stock No. 223-7792
BrandRS PRO
kr 875,91
Each
Units
Phase - SPDT Overvoltage Protection, Undervoltage Protection 3 - - - - - - - - -
RS Stock No. 223-7789
BrandRS PRO
kr 1 193,46
Each
Units
Phase Voltage - 2CO Overvoltage Protection, Undervoltage Protection 3 - - - - - 2 → 999s - - -
RS Stock No. 102-6137
BrandRS PRO
kr 899,61
Each
Units
Phase, Voltage - SPDT Overvoltage, Undervoltage 3 - - - - Phase Failure, Phase Sequence 0.2 → 10s - - 48 → 63Hz
RS Stock No. 225-7387
BrandRS PRO
kr 1 053,33
Each
Units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 - - - - Phase Failure, Phase Sequence - - - -
RS Stock No. 102-6133
BrandRS PRO
kr 1 225,97
Each
Units
Voltage - SPDT Overvoltage, Undervoltage 1 Maximum of 500 V - - - - 0.1 → 30s - - 48 → 63Hz
RS Stock No. 225-7386
BrandRS PRO
kr 1 093,45
Each
Units
Voltage - DPDT Overvoltage, Undervoltage 3 - - - - - - - - -
RS Stock No. 225-7385
BrandRS PRO
kr 1 084,86
Each
Units
Voltage - DPDT Undervoltage 3 243 → 540 V - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.2 → 10s - - -
RS Stock No. 225-7384
BrandRS PRO
kr 529,76
Each
Units
Phase - - - 3 - - - - Phase Failure, Phase Sequence - - - -
RS Stock No. 850-5411
Mfr. Part No.LBVR/A 12-24VDC
kr 783,94
Each
Units
Voltage - SPDT Undervoltage - 12 → 24V dc - - - - 0 → 30s - - -