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. 179-3552
Fabrikantnummer184783 & EMR6-IF15-A-1
FabrikantEaton
194,65 €
Each
Aantal stuks
Current - - - 1 - - 0.3 A, 1 A, 3A 1.5 A, 5 A, 15A - 0.1 → 30s - - -
RS-stocknr. 111-3100
FabrikantnummerK8DT-AW1CD
FabrikantOmron
101,46 €
Each
Aantal stuks
Current - SPDT - 1 - Overcurrent, Undercurrent 2 mA, 10 mA, 20mA 20 mA, 100 mA, 500mA - 250ms - - -
RS-stocknr. 179-3550
Fabrikantnummer184782 & EMR6-IF1-A-1
FabrikantEaton
194,65 €
Each
Aantal stuks
Current - - - 1 - - 0.003 A, 0.01 A, 0.1A 0.03 A, 0.1 A, 1A - 0.1 → 30s - - -
RS-stocknr. 188-3545
FabrikantnummerLR44/2 100-230V AC/DC
FabrikantBroyce Control
39,82 €
Each
Aantal stuks
Voltage - 2 x SPNO - - - - - - - 1s - - 48 → 63Hz
RS-stocknr. 181-2030
Fabrikantnummer2963598
FabrikantPhoenix Contact
83,17 €
Each
Aantal stuks
- - - - - 19.2 → 28.8V dc - - - - - - - -
RS-stocknr. 111-3140
FabrikantnummerK8DT-PZ2TN
FabrikantOmron
121,53 €
Each
Aantal stuks
Phase, Voltage - SPST - 3 - - - - Phase Loss, Phase Sequence 250ms - - -
RS-stocknr. 111-3139
FabrikantnummerK8DT-PZ2CN
FabrikantOmron
121,53 €
Each
Aantal stuks
Phase, Voltage - SPDT - 3 - - - - Phase Loss, Phase Sequence 250ms - - -