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. 518-7174
Fabrikantnummer3UG4615-1CR20
FabrikantSiemens
199,00 €
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. 518-7297
Fabrikantnummer3UG4513-1BR20
FabrikantSiemens
137,00 €
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. 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. 518-7168
Fabrikantnummer3UG4622-1AW30
FabrikantSiemens
156,00 €
Each
Aantal stuks
Current 24 → 240 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 50mA 10A - 0.1 → 20 s - - -
RS-stocknr. 758-6942
Fabrikantnummer3UG4632-1AW30
FabrikantSiemens
161,00 €
Each
Aantal stuks
Voltage 24 → 240 V ac/dc SPDT Overvoltage, Undervoltage - 10 → 600 V ac/dc - - - - 0.1 → 20 s - - -
RS-stocknr. 518-7203
Fabrikantnummer3RN1011-1BB00
FabrikantSiemens
106,70 €
Each
Aantal stuks
Thermistor motor protection relay 24 V ac/dc DPDT - - - - - - - - Overtemperature, Undertemperature +60 → +180°C -
RS-stocknr. 417-9885
Fabrikantnummer3RN1000-1AG00
FabrikantSiemens
62,48 €
Each
Aantal stuks
Thermistor motor protection relay 110 V ac SPDT - - - - - - - - Overtemperature, Undertemperature +60 → +180°C -
RS-stocknr. 417-9914
Fabrikantnummer3RN1013-1BW10
FabrikantSiemens
203,50 €
Each
Aantal stuks
Thermistor motor protection relay 24 → 240 V ac/dc DPDT - - - - - - - - Overtemperature, Undertemperature +60 → +180°C -
RS-stocknr. 418-4988
Fabrikantnummer3RS1040-1GW50
FabrikantSiemens
334,00 €
Each
Aantal stuks
Temperature 24 → 240 V ac/dc DPDT - - - - - - - 0 → 999 s Overtemperature, Undertemperature -50 → +500°C -
RS-stocknr. 518-7275
Fabrikantnummer3UG4511-1BP20
FabrikantSiemens
108,00 €
Each
Aantal stuks
Phase 320 → 500 V ac DPDT - 3 - - - - Phase Sequence - - - -
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. 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
62,48 €
Each
Aantal stuks
Thermistor motor protection relay 230 V ac SPDT - - - - - - - - Overtemperature, Undertemperature +60 → +180°C -
RS-stocknr. 746-6022
Fabrikantnummer3RN1012-1CK00
FabrikantSiemens
141,90 €
Each
Aantal stuks
Thermistor motor protection relay 230 V ac SPDT - - - - - - - - Winding Temperature +60 → +180°C -
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. 417-9908
Fabrikantnummer3RN1010-1CW00
FabrikantSiemens
104,28 €
Each
Aantal stuks
Thermistor motor protection relay 24 → 240 V ac/dc SPDT - - - - - - - - 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. 772-1215
Fabrikantnummer5SV8000-6KK
FabrikantSiemens
196,00 €
Each
Aantal stuks
Current 230 V ac - - - - Residual 30mA 5A - 0.02 → 5 s - - -
RS-stocknr. 175-2282
Fabrikantnummer3RN2011-1BW30
FabrikantSiemens
110,00 €
Each
Aantal stuks
Thermistor motor temperature protection 240 V ac/dc DPDT Motor Voltage - 24 → 240 V ac/dc - - - - - - - -
RS-stocknr. 175-2269
Fabrikantnummer3RN2000-1AA30
FabrikantSiemens
61,10 €
Each
Aantal stuks
Thermistor motor temperature protection 24 V ac/dc SPDT Motor Voltage - - - - - - - - - -