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. 914-4654
Mfr. Part No.ICV 230Vac
BrandHiquel
£78.49
Each
Units
Voltage 230 V ac DPDT Overvoltage, Undervoltage 1 0 → 10 (E1-M) V, 0 → 45 (E2-M) V, 0 → 450 (E3-M) V - - - - - - - -
RS Stock No. 914-4639
Mfr. Part No.ICC 230Vac
BrandHiquel
£80.35
Each
Units
Current 230 V ac DPDT - 1 - Overcurrent, Undercurrent 0 (E1-M) mA, 0 (E2-M) mA, 0 (E3-M) A 1 (E2-M) A, 10 (E3-M) A, 100 (E1-M) mA - - - - -
RS Stock No. 914-4651
Mfr. Part No.ICP200-400 (3 & 4 Wire)
BrandHiquel
£72.10
Each
Units
Phase 150 → 440 V ac DPDT - 3 - - - - Phase Failure, Phase Sequence - - - -
RS Stock No. 914-4660
Mfr. Part No.ICP300-500 (3-Wire)
BrandHiquel
£72.10
Each
Units
Phase 180 → 550 V ac DPDT - 3 - - - - Phase Failure, Phase Sequence - - - -
RS Stock No. 914-4632
Mfr. Part No.ICC 24Vac
BrandHiquel
£54.77
Each
Units
Current 24 V ac DPDT - 1 - Overcurrent, Undercurrent 0 (E1-M) mA, 0 (E2-M) mA, 0 (E3-M) A 1 (E2-M) A, 10 (E3-M) A, 100 (E1-M) mA - - - - -
RS Stock No. 914-4648
Mfr. Part No.ICC 400Vac
BrandHiquel
£88.06
Each
Units
Current 400 V ac DPDT - 1 - Overcurrent, Undercurrent 0 (E1-M) mA, 0 (E2-M) mA, 0 (E3-M) A 1 (E2-M) A, 10 (E3-M) A, 100 (E1-M) mA - - - - -
RS Stock No. 914-4635
Mfr. Part No.ICC 115Vac
BrandHiquel
£66.48
Each
Units
Current 115 V ac DPDT - 1 - Overcurrent, Undercurrent 0 (E1-M) mA, 0 (E2-M) mA, 0 (E3-M) A 1 (E2-M) A, 10 (E3-M) A, 100 (E1-M) mA - - - - -
RS Stock No. 914-4663
Mfr. Part No.ICP-V (4-Wire)
BrandHiquel
£72.10
Each
Units
Phase 115 → 230 V ac DPDT - 3 - - - - Phase Failure, Phase Sequence - - - -
RS Stock No. 914-4641
Mfr. Part No.ICV 24Vac
BrandHiquel
£78.49
Each
Units
Voltage 24 V ac DPDT Overvoltage, Undervoltage 1 0 → 10 (E1-M) V, 0 → 45 (E2-M) V, 0 → 450 (E3-M) V - - - - - - - -
RS Stock No. 914-4645
Mfr. Part No.ICV 115Vac
BrandHiquel
£78.49
Each
Units
Voltage 115 V ac DPDT Overvoltage, Undervoltage 1 0 → 10 (E1-M) V, 0 → 45 (E2-M) V, 0 → 450 (E3-M) V - - - - - - - -
RS Stock No. 914-4657
Mfr. Part No.ICV 400Vac
BrandHiquel
£85.33
Each
Units
Voltage 400 V ac DPDT Overvoltage, Undervoltage 1 0 → 10 (E1-M) V, 0 → 45 (E2-M) V, 0 → 450 (E3-M) V - - - - - - - -