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
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. 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. 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
147,00 €
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. 518-7275
Fabrikantnummer3UG4511-1BP20
FabrikantSiemens
101,00 €
Each
Aantal stuks
Phase 320 → 500 V ac DPDT - 3 - - - - Phase Sequence - - - -
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. 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. 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
94,80 €
Each
Aantal stuks
Thermistor motor protection relay 24 240 V ac/dc SPDT - - - - - - - - Overtemperature, Undertemperature +60 +180°C -
RS-stocknr. 417-9885
Fabrikantnummer3RN1000-1AG00
FabrikantSiemens
55,20 €
Each
Aantal stuks
Thermistor motor protection relay 110 V ac 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. 746-6022
Fabrikantnummer3RN1012-1CK00
FabrikantSiemens
129,00 €
Each
Aantal stuks
Thermistor motor protection relay 230 V ac SPDT - - - - - - - - Winding Temperature +60 → +180°C -
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. 518-7203
Fabrikantnummer3RN1011-1BB00
FabrikantSiemens
97,00 €
Each
Aantal stuks
Thermistor motor protection relay 24 V ac/dc DPDT - - - - - - - - Overtemperature, Undertemperature +60 → +180°C -
RS-stocknr. 758-6927
Fabrikantnummer3UG4501-1AW30
FabrikantSiemens
110,00 €
Each
Aantal stuks
- 24 240 V ac/dc SPDT - - - - - - - 0.3 10 s - - -
RS-stocknr. 418-5004
Fabrikantnummer3RS1010-1CK00
FabrikantSiemens
146,00 €
Each
Aantal stuks
Temperature 110/230 V ac SPDT - - - - - - - - Undertemperature -50 → +50°C -
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. 463-5486
Fabrikantnummer3RN1011-1BM00
FabrikantSiemens
117,00 €
Each
Aantal stuks
Thermistor motor protection relay 230 V ac DPDT - - - - - - - - Overtemperature, Undertemperature +60 → +180°C -