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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Beskrivning Pris 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-artikelnummer 223-7795
VarumärkeRS PRO
746,59 kr
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Phase - SPDT Overvoltage Protection, Undervoltage Protection 3 - - - - - - - - -
RS-artikelnummer 102-6134
VarumärkeRS PRO
1 202,58 kr
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Current - SPDT - 1 - Overcurrent, Undercurrent 1A 10A - 0.1 → 30s - - 48 → 63Hz
RS-artikelnummer 102-6131
VarumärkeRS PRO
680,36 kr
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Voltage - SPDT Overvoltage, Undervoltage 1 - - - - - 0.2 → 10s - - 48 → 63Hz
RS-artikelnummer 102-6137
VarumärkeRS PRO
882,45 kr
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Phase, Voltage - SPDT Overvoltage, Undervoltage 3 - - - - Phase Failure, Phase Sequence 0.2 → 10s - - 48 → 63Hz
RS-artikelnummer 102-6135
VarumärkeRS PRO
652,10 kr
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Phase, Voltage - SPDT Undervoltage 3 Maximum of 280 V - - - Phase Failure, Phase Sequence 100ms - - 48 → 63Hz
RS-artikelnummer 225-7385
VarumärkeRS PRO
1 064,16 kr
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Voltage - DPDT Undervoltage 3 243 → 540 V - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.2 → 10s - - -
RS-artikelnummer 102-6130
VarumärkeRS PRO
620,96 kr
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Voltage - SPDT Undervoltage 1 12 → 24V dc - - - - 0 → 30s - - -
RS-artikelnummer 223-7792
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859,20 kr
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Phase - SPDT Overvoltage Protection, Undervoltage Protection 3 - - - - - - - - -
RS-artikelnummer 102-6136
VarumärkeRS PRO
683,03 kr
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Phase, Voltage - SPDT Undervoltage 3 - - - - Phase Failure, Phase Sequence 0.2 → 10s - - 48 → 63Hz
RS-artikelnummer 223-7790
VarumärkeRS PRO
1 254,30 kr
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Phase Voltage - 2CO Overvoltage Protection, Undervoltage Protection 3 - - - - - 2 → 999s - - -
RS-artikelnummer 223-7791
VarumärkeRS PRO
824,33 kr
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Phase - SPDT Overvoltage Protection, Undervoltage Protection 3 - - - - - - - - -
RS-artikelnummer 225-7384
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519,66 kr
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Phase - - - 3 - - - - Phase Failure, Phase Sequence - - - -
RS-artikelnummer 223-7794
VarumärkeRS PRO
995,27 kr
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Phase - SPDT Overvoltage Protection, Undervoltage Protection 3 - - - - - - - - -
RS-artikelnummer 102-6133
VarumärkeRS PRO
1 202,58 kr
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Voltage - SPDT Overvoltage, Undervoltage 1 Maximum of 500 V - - - - 0.1 → 30s - - 48 → 63Hz
RS-artikelnummer 223-7789
VarumärkeRS PRO
1 170,69 kr
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Phase Voltage - 2CO Overvoltage Protection, Undervoltage Protection 3 - - - - - 2 → 999s - - -
RS-artikelnummer 223-7788
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1 086,77 kr
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Phase, Voltage - 1CO Overvoltage Protection, Undervoltage Protection 3 - - - - - 2 → 999s - - -
RS-artikelnummer 225-7388
VarumärkeRS PRO
814,41 kr
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Phase, Voltage - DPDT Undervoltage 3 243 → 540 V - - - Phase Failure, Phase Sequence 0.2 → 10s - - -
RS-artikelnummer 225-7387
VarumärkeRS PRO
1 033,23 kr
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Phase, Voltage - DPDT Overvoltage, Undervoltage 3 - - - - Phase Failure, Phase Sequence - - - -
RS-artikelnummer 225-7386
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1 072,59 kr
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Voltage - DPDT Overvoltage, Undervoltage 3 - - - - - - - - -
RS-artikelnummer 884-2473
Tillv. art.nrMAC04D0100
VarumärkeGIC
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Phase, Voltage - DPDT Overvoltage Protection, Undervoltage Protection 3 - - - - Neutral Loss, Phase Failure, Phase Reversal, Phase Sequence, Phase Symmetry - - - 47 → 53Hz