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. 392-7289
Fabrikantnummer3RN1010-1CM00
FabrikantSiemens
€ 72,40
Each
Aantal stuks
Thermistor motor protection relay 230 V ac SPDT - - - - - - - - Overtemperature, Undertemperature +60 → +180°C -
RS-stocknr. 518-7297
Fabrikantnummer3UG4513-1BR20
FabrikantSiemens
€ 129,00
Each
Aantal stuks
Phase, Voltage 160 → 690 V ac DPDT Undervoltage 3 160 → 690 V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20 s - - -
RS-stocknr. 417-9908
Fabrikantnummer3RN1010-1CW00
FabrikantSiemens
€ 94,80
Each
Aantal stuks
Thermistor motor protection relay 24 → 240 V ac/dc SPDT - - - - - - - - Overtemperature, Undertemperature +60 → +180°C -
RS-stocknr. 518-7174
Fabrikantnummer3UG4615-1CR20
FabrikantSiemens
€ 187,00
Each
Aantal stuks
Phase, Voltage 160 → 690 V ac DPDT Overvoltage, Undervoltage 3 160 → 690 V ac - - - Phase Failure, Phase Sequence 0.1 → 20 s - - -
RS-stocknr. 758-6927
Fabrikantnummer3UG4501-1AW30
FabrikantSiemens
€ 110,00
Each
Aantal stuks
- 24 → 240 V ac/dc SPDT - - - - - - - 0.3 → 10 s - - -
RS-stocknr. 417-9891
Fabrikantnummer3RN1000-1AM00
FabrikantSiemens
€ 56,80
Each
Aantal stuks
Thermistor motor protection relay 230 V ac SPDT - - - - - - - - Overtemperature, Undertemperature +60 → +180°C -
RS-stocknr. 518-7051
Fabrikantnummer3UG4614-1BR20
FabrikantSiemens
€ 145,00
Each
Aantal stuks
Phase, Voltage 160 → 690 V ac DPDT Undervoltage 3 160 → 690 V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20 s - - -
RS-stocknr. 518-7168
Fabrikantnummer3UG4622-1AW30
FabrikantSiemens
€ 147,00
Each
Aantal stuks
Current 24 → 240 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 50mA 10A - 0.1 → 20 s - - -
RS-stocknr. 392-7267
Fabrikantnummer3RN1010-1CB00
FabrikantSiemens
€ 72,40
Each
Aantal stuks
Thermistor motor protection relay 24 V ac/dc SPDT - - - - - - - - Overtemperature, Undertemperature +60 → +180°C -
RS-stocknr. 758-6924
Fabrikantnummer3UG4512-1AR20
FabrikantSiemens
€ 107,00
Each
Aantal stuks
Phase 160 → 690 V ac SPDT - - 160 → 690 V ac - - - Phase Failure, Phase Sequence - - - -
RS-stocknr. 417-9914
Fabrikantnummer3RN1013-1BW10
FabrikantSiemens
€ 185,00
Each
Aantal stuks
Thermistor motor protection relay 24 → 240 V ac/dc DPDT - - - - - - - - Overtemperature, Undertemperature +60 → +180°C -
RS-stocknr. 417-9920
Fabrikantnummer3RN1022-1DW00
FabrikantSiemens
€ 259,00
Each
Aantal stuks
Thermistor motor protection relay 24 → 240 V ac/dc SPST - - - - - - - - Overtemperature, Undertemperature +60 → +180°C -
RS-stocknr. 758-6920
Fabrikantnummer3UG4511-1AN20
FabrikantSiemens
€ 96,90
Each
Aantal stuks
Phase 160 → 260 V ac SPDT - - 160 → 260 V ac - - - Phase Sequence - - - -
RS-stocknr. 417-9879
Fabrikantnummer3RN1000-1AB00
FabrikantSiemens
€ 56,80
Each
Aantal stuks
Thermistor motor protection relay 24 V ac/dc SPDT - - - - - - - - Overtemperature, Undertemperature +60 → +180°C -
RS-stocknr. 746-6025
Fabrikantnummer3RN1010-1CG00
FabrikantSiemens
€ 72,40
Each
Aantal stuks
Thermistor motor protection relay 110 V ac SPDT - - - - - - - - Winding Temperature +60 → +180°C -
RS-stocknr. 758-6930
Fabrikantnummer3UG4622-2AW30
FabrikantSiemens
€ 171,00
Each
Aantal stuks
Current 24 → 240 V ac/dc SPDT - - - Overcurrent, Undercurrent 50mA 15A - 0.1 → 20 s - - -
RS-stocknr. 518-7180
Fabrikantnummer3UG4617-1CR20
FabrikantSiemens
€ 216,00
Each
Aantal stuks
Phase, Voltage 160 → 690 V ac DPDT Overvoltage, Undervoltage 3 160 → 690 V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20 s - - -
RS-stocknr. 758-6946
Fabrikantnummer3UG4633-1AL30
FabrikantSiemens
€ 155,00
Each
Aantal stuks
Voltage 17 → 275 V ac/dc SPDT Overvoltage, Undervoltage - 17 → 275 V ac/dc - - - - 0.1 → 20 s - - -
RS-stocknr. 418-4988
Fabrikantnummer3RS1040-1GW50
FabrikantSiemens
€ 315,00
Each
Aantal stuks
Temperature 24 → 240 V ac/dc DPDT - - - - - - - 0 → 999 s Overtemperature, Undertemperature -50 → +500°C -
RS-stocknr. 518-7102
Fabrikantnummer3UG4632-1AA30
FabrikantSiemens
€ 136,00
Each
Aantal stuks
Voltage 24 V ac/dc SPDT Overvoltage, Undervoltage 1 10 → 600 V ac/dc - - - - 0.1 → 20 s - - -