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. 124-0193
FabrikantnummerRM35LM33MW
56,52 €
Each
Aantal stuks
Level - DPDT - 1 - - - - - 0.1 → 5s - - -
RS-stocknr. 146-480
FabrikantnummerRM35TF30
130,86 €
Each
Aantal stuks
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 194 → 528V ac - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
RS-stocknr. 146-452
FabrikantnummerRM17UB310
125,01 €
Each
Aantal stuks
Voltage - SPDT Absence of Neutral, Overvoltage and Undervoltage Between Neutral, Overvoltage and Undervoltage Between Phase 3 183 → 528V ac - - - - 0.3 → 30s - - -
RS-stocknr. 146-238
FabrikantnummerRM17TG20
63,27 €
Each
Aantal stuks
Phase - DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100ms - - -
RS-stocknr. 776-3648
FabrikantnummerA9E16065
148,16 €
Each
Aantal stuks
Time Delay - SPDT - - 24 → 240V ac - - - - - - - -
RS-stocknr. 146-092
FabrikantnummerRM17JC00MW
115,29 €
Each
Aantal stuks
Current - SPDT - - - Overcurrent 2A 20A - 0.5s - - -
RS-stocknr. 609-8069
FabrikantnummerLT3SE00BD
103,83 €
Each
Aantal stuks
Temperature - SPST - - - - - - - - Overtemperature, Undertemperature - -
RS-stocknr. 124-0182
FabrikantnummerRM22LG11MR
41,79 €
Each
Aantal stuks
Level - SPDT - 1 - - - - - - - - -
RS-stocknr. 609-8075
FabrikantnummerLT3SM00ED
235,29 €
Each
Aantal stuks
Temperature - SPDT - - - - - - - - Overtemperature, Undertemperature - -
RS-stocknr. 146-159
FabrikantnummerRM17UAS16
88,65 €
Each
Aantal stuks
Voltage - SPDT Overvoltage, Self Powered, Undervoltage 1 20 → 80V ac/dc - - - - 0.1 → 10s - - -
RS-stocknr. 146-468
FabrikantnummerRM35UB3N30
162,27 €
Each
Aantal stuks
Voltage - DPDT Absence of Neutral, Overvoltage and Undervoltage Between Neutral, Overvoltage and Undervoltage Between Phase 3 114 → 329V ac - - - - 0.3 → 30s - - -
RS-stocknr. 145-976
FabrikantnummerRM35JA32MW
108,36 €
Each
Aantal stuks
Current - DPDT - - - Overcurrent, Undercurrent 0.15A 15A - 0.3 → 30s - - -
RS-stocknr. 146-109
FabrikantnummerRM35UA11MW
154,10 €
Each
Aantal stuks
Voltage - DPDT Overvoltage, Undervoltage - - - - - - 0.3 → 30s - - -
RS-stocknr. 146-474
FabrikantnummerRM35UB330
149,90 €
Each
Aantal stuks
Voltage - DPDT Absence of Neutral, Overvoltage and Undervoltage Between Neutral, Overvoltage and Undervoltage Between Phase 3 194 → 528V ac - - - - 0.3 → 30s - - -
RS-stocknr. 146-597
FabrikantnummerRM17TU00
70,25 €
Each
Aantal stuks
Phase, Voltage - SPDT Undervoltage 3 183 → 528V ac - - - Phase Failure, Phase Sequence 0.1 → 10s - - -
RS-stocknr. 124-0179
FabrikantnummerRM22JA31MR
193,50 €
Each
Aantal stuks
Current - DPDT - 1 - Overcurrent, Undercurrent 4mA 1A - 0.1 → 30s - - -
RS-stocknr. 776-3663
FabrikantnummerA9E16070
246,87 €
Each
Aantal stuks
Time Delay - SPDT - - 24 → 240V ac - - - - - - - -
RS-stocknr. 776-3666
FabrikantnummerA9E21182
219,47 €
Each
Aantal stuks
Voltage - SPDT Overvoltage, Undervoltage - 10 → 100 V ac/dc, 50 → 500V ac/dc - - - - 0.1 → 10s - - -
RS-stocknr. 609-8081
FabrikantnummerLT3SM00MW
223,90 €
Each
Aantal stuks
Temperature - DPDT - - - - - - - - Overtemperature, Undertemperature - -
RS-stocknr. 124-0185
FabrikantnummerRM22TU21
51,39 €
Each
Aantal stuks
Phase, Voltage - DPDT Undervoltage 3 200 → 240V ac - - - Phase Failure, Phase Sequence - - - -