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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Omschrijving Prijs 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-stocknr. 776-1581
Fabrikantnummer72.01.8.240.0000
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50,92 €
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Aantal stuks
Level 230 → 240 V ac SPDT - 1 - - - - - 0.5 → 7 s - - -
RS-stocknr. 776-1579
Fabrikantnummer72.01.8.024.0002
FabrikantFinder
50,92 €
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Aantal stuks
Level 24 V ac SPDT - 1 - - - - - 0.5 → 7 s - - -
RS-stocknr. 776-1575
Fabrikantnummer72.01.8.024.0000
FabrikantFinder
50,92 €
Each
Aantal stuks
Level 24 V ac SPDT - 1 - - - - - 0.5 → 7 s - - -
RS-stocknr. 776-1588
Fabrikantnummer72.01.8.125.0000
FabrikantFinder
50,92 €
Each
Aantal stuks
Level 110 → 125 V ac SPDT - 1 - - - - - 0.5 → 7 s - - -
RS-stocknr. 789-2746
Fabrikantnummer70.41.8.400.2030
FabrikantFinder
85,09 €
Each
Aantal stuks
Voltage 380 → 415 V SPDT Overvoltage, Undervoltage 3 300 → 480 V ac - - - Phase Asymmetry, Phase Loss, Phase Sequence 0.5 → 60 s - - 50 → 60 Hz
RS-stocknr. 788-8646
Fabrikantnummer72.42.0.230.0000
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60,78 €
Each
Aantal stuks
MultiFunction 110 → 240 V ac/dc DPST - - - - - - - 0.2 → 20 s - - -
RS-stocknr. 789-2749
Fabrikantnummer70.11.8.230.2022
FabrikantFinder
66,47 €
Each
Aantal stuks
Voltage 220 → 240 V SPDT Overvoltage Protection, Undervoltage Protection 1 170 → 270 V ac - - - - 0.5 → 60 s - - 50 → 60 Hz
RS-stocknr. 776-1594
Fabrikantnummer72.01.9.024.0000
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50,92 €
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Aantal stuks
Level 24 V dc SPDT - 1 - - - - - 0.5 → 7 s - - -
RS-stocknr. 789-2742
Fabrikantnummer70.31.8.400.2022
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76,59 €
Each
Aantal stuks
Voltage 380 → 415 V SPDT Overvoltage Protection, Undervoltage Protection 3 300 → 480 V ac - - - Phase Loss, Phase Sequence 0.5 → 60 s - - 50 → 60 Hz
RS-stocknr. 788-8642
Fabrikantnummer72.42.0.024.0000
FabrikantFinder
54,67 €
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Aantal stuks
MultiFunction 24 V dc DPST - - - - - - - 0.2 → 20 s - - -
RS-stocknr. 776-1585
Fabrikantnummer72.01.8.240.0002
FabrikantFinder
53,55 €
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Aantal stuks
Level 230 → 240 V ac SPDT - 1 - - - - - 0.5 → 7 s - - -
RS-stocknr. 789-2755
Fabrikantnummer70.61.8.400.0000
FabrikantFinder
49,39 €
Each
Aantal stuks
Voltage 208 → 480 V SPDT - 3 - - - - Phase Loss, Phase Sequence 0.5 s - - 50 → 60 Hz