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. 123-9728
FabrikantnummerV4IM35AL20 24-240V AC/DC
FabrikantTele
€ 137,76
Each
Aantal stuks
Current 24 → 240 V ac/dc DPDT - 1 - Overcurrent, Undercurrent - 35A - 0.1 → 10 s - - -
RS-stocknr. 123-9745
FabrikantnummerG2LM20 230VAC
FabrikantTele
€ 92,94
Each
Aantal stuks
Liquid Level 230 V ac DPDT - 1 - - - - - 0.5 → 10 s - - -
RS-stocknr. 123-9725
FabrikantnummerV2PF480Y/277VSY01
FabrikantTele
€ 60,61
Each
Aantal stuks
Phase 120 → 208 V ac, 277 → 480 V ac SPDT - 3 - - - - Phase Loss, Phase Sequence 250 ms - - -
RS-stocknr. 123-9713
FabrikantnummerE1PF400VSY01
FabrikantTele
€ 62,45
Each
Aantal stuks
Phase, Voltage 230 → 400 V SPDT Self Powered 3 230 → 400 V - - - Phase Failure, Phase Sequence 100 ms - - -
RS-stocknr. 123-9732
FabrikantnummerK3PF400VSY02
FabrikantTele
€ 96,27
Each
Aantal stuks
Phase, Voltage 230 → 400 V DPDT Self Powered 3 230 → 400 V - - - Phase Failure, Phase Sequence 100 ms - - -
RS-stocknr. 123-9724
FabrikantnummerV2PM400Y/230VS10
FabrikantTele
€ 107,98
Each
Aantal stuks
Phase 230 → 400 V ac SPDT - 1, 3 - - - - Phase Loss, Phase Sequence 0.1 → 10 s, 200 ms - - -
RS-stocknr. 123-9726
FabrikantnummerV4PF480Y/277VSYTK02
FabrikantTele
€ 98,06
Each
Aantal stuks
Phase, Temperature 120 → 208 V ac, 277 → 480 V ac DPDT - 3 - - - - Phase Loss, Phase Sequence 250 (Tripping) ms, 500 (Start Up) ms Overtemperature - -
RS-stocknr. 123-9727
FabrikantnummerV4IM100AL20 24-240V AC/DC
FabrikantTele
€ 137,76
Each
Aantal stuks
Current 24 → 240 V ac/dc DPDT - 1 - Overcurrent, Undercurrent - 100A - 0.1 → 10 s, 200 ms - - -
RS-stocknr. 123-9752
FabrikantnummerG2PM230VSY20 24-240V
FabrikantTele
€ 185,24
Each
Aantal stuks
Phase, Voltage 12 → 400 V ac, 24 V dc DPDT Undervoltage 3 132 → 230 V - - - Phase Failure, Phase Sequence 0.1 → 10 s - - -
RS-stocknr. 123-9731
FabrikantnummerK3IM5AACL20 230VAC
FabrikantTele
€ 159,02
Each
Aantal stuks
Current 230 V ac DPDT - 1 - Overcurrent, Undercurrent - 10 (Over Load) A, 5 (Input) A - 0 → 10 (Start Up) s, 0.1 → 10 (Tripping) s - - -
RS-stocknr. 182-9994
FabrikantnummerE3YM230VS20
FabrikantTele
€ 91,49
Each
Aantal stuks
Voltage 230/132 V ac DPDT - 1, 3 - - - - - 30 ms - - 48 → 63 Hz
RS-stocknr. 123-9718
FabrikantnummerE1YM480Y/277VS1
FabrikantTele
€ 134,23
Each
Aantal stuks
Phase, Voltage 277 → 480 V SPDT Undervoltage 3 277 → 480 V - - - Phase Failure, Phase Sequence 0.1 → 10 s - - -
RS-stocknr. 123-9730
FabrikantnummerK3UM230VAC02
FabrikantTele
€ 143,49
Each
Aantal stuks
Voltage 230 V ac DPDT Undervoltage 1 Maximum of 230 V ac - - - - - - - -
RS-stocknr. 123-9721
FabrikantnummerV2TF01
FabrikantTele
€ 51,78
Each
Aantal stuks
Temperature 24 → 240 V ac/dc SPST - 1 - - - - - 50 ms Overtemperature - -
RS-stocknr. 123-9716
FabrikantnummerE1UM230V01
FabrikantTele
€ 154,65
Each
Aantal stuks
Voltage 24 → 230 V ac SPDT Self Powered 1 24 → 230 V ac - - - - 500 (Reset) ms - - -
RS-stocknr. 730-0495
FabrikantnummerE3TF01 230V AC
FabrikantTele
€ 98,13
Each
Aantal stuks
Temperature 230 V ac SPDT - - - - - - - 250 ms Winding Temperature - -
RS-stocknr. 123-9749
FabrikantnummerG2IM5AL20 24-240VAC/DC
FabrikantTele
€ 176,97
Each
Aantal stuks
Current 12 → 400 V ac, 24 V dc DPDT - 1 - Overcurrent, Undercurrent 20mA 5A - 0 → 10 (Start Up) s, 0.1 → 10 (Tripping) s - - -
RS-stocknr. 123-9714
FabrikantnummerE1PF480Y/277VSY10
FabrikantTele
€ 80,00
Each
Aantal stuks
Phase, Voltage 277 → 480 V SPDT Self Powered 3 277 → 480 V - - - Phase Failure, Phase Sequence 0.1 → 20 s - - -
RS-stocknr. 123-9743
FabrikantnummerG2TF02 24-240VAC/DC
FabrikantTele
€ 99,20
Each
Aantal stuks
Temperature 24 → 240 V ac/dc DPDT - 1 - - - - - - - - -
RS-stocknr. 123-9747
FabrikantnummerG2UM300VL20 24-240VAC/DC
FabrikantTele
€ 172,57
Each
Aantal stuks
Voltage 24 → 240 V ac/dc DPDT Overvoltage, Undervoltage 1 30 → 300 V ac/dc - - - - 0 → 10 (Start Up) s, 0.1 → 10 (Tripping) s - - -