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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Description Price 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 Stock No. 417-9891
Mfr. Part No.3RN1000-1AM00
BrandSiemens
$107.12
Each
units
Thermistor motor protection relay 230 V ac SPDT - - - - - - - - Overtemperature, Undertemperature +60 → +180°C -
RS Stock No. 417-9914
Mfr. Part No.3RN1013-1BW10
BrandSiemens
$349.25
Each
units
Thermistor motor protection relay 24 → 240 V ac/dc DPDT - - - - - - - - Overtemperature, Undertemperature +60 → +180°C -
RS Stock No. 518-7180
Mfr. Part No.3UG4617-1CR20
BrandSiemens
$383.73
Each
units
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 Stock No. 518-7168
Mfr. Part No.3UG4622-1AW30
BrandSiemens
$524.95
Each
units
Current 24 → 240 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 50mA 10A - 0.1 → 20 s - - -
RS Stock No. 392-7289
Mfr. Part No.3RN1010-1CM00
BrandSiemens
$255.39
Each
units
Thermistor motor protection relay 230 V ac SPDT - - - - - - - - Overtemperature, Undertemperature +60 → +180°C -
RS Stock No. 518-7203
Mfr. Part No.3RN1011-1BB00
BrandSiemens
$248.22
Each
units
Thermistor motor protection relay 24 V ac/dc DPDT - - - - - - - - Overtemperature, Undertemperature +60 → +180°C -
RS Stock No. 758-6924
Mfr. Part No.3UG4512-1AR20
BrandSiemens
$172.98
Each
units
Phase 160 → 690 V ac SPDT - - 160 → 690 V ac - - - Phase Failure, Phase Sequence - - - -
RS Stock No. 518-7051
Mfr. Part No.3UG4614-1BR20
BrandSiemens
$257.92
Each
units
Phase, Voltage 160 → 690 V ac DPDT Undervoltage 3 160 → 690 V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20 s - - -
RS Stock No. 518-7174
Mfr. Part No.3UG4615-1CR20
BrandSiemens
$333.41
Each
units
Phase, Voltage 160 → 690 V ac DPDT Overvoltage, Undervoltage 3 160 → 690 V ac - - - Phase Failure, Phase Sequence 0.1 → 20 s - - -
RS Stock No. 463-5486
Mfr. Part No.3RN1011-1BM00
BrandSiemens
$196.46
Each
units
Thermistor motor protection relay 230 V ac DPDT - - - - - - - - Overtemperature, Undertemperature +60 → +180°C -
RS Stock No. 175-2282
Mfr. Part No.3RN2011-1BW30
BrandSiemens
$177.73
Each
units
Thermistor motor temperature protection 240 V ac/dc DPDT Motor Voltage - 24 → 240 V ac/dc - - - - - - - -
RS Stock No. 418-4988
Mfr. Part No.3RS1040-1GW50
BrandSiemens
$591.43
Each
units
Temperature 24 → 240 V ac/dc DPDT - - - - - - - 0 → 999 s Overtemperature, Undertemperature -50 → +500°C -
RS Stock No. 175-2283
Mfr. Part No.3RN2011-2BA30
BrandSiemens
$166.41
Each
units
Thermistor motor temperature protection 24 V ac/dc DPDT Motor Voltage - - - - - - - - - -
RS Stock No. 175-2284
Mfr. Part No.3RN2011-2BW30
BrandSiemens
$207.71
Each
units
Thermistor motor temperature protection 240 V ac/dc DPDT Motor Voltage - 24 → 240 V ac/dc - - - - - - - -
RS Stock No. 175-2292
Mfr. Part No.3RN2013-1BW30
BrandSiemens
$368.40
Each
units
Thermistor motor temperature protection 240 V ac/dc DPDT Motor Voltage - 24 → 240 V ac/dc - - - - - - - -
RS Stock No. 392-7245
Mfr. Part No.3RN1011-1CB00
BrandSiemens
$190.29
Each
units
Thermistor motor protection relay 24 V ac/dc SPDT - - - - - - - - Overtemperature, Undertemperature +60 → +180°C -
RS Stock No. 758-6955
Mfr. Part No.3UG4641-1CS20
BrandSiemens
$353.69
Each
units
Current 90 → 690 V ac DPDT - - - No Current, Overcurrent, Undercurrent 0.2A 10A - 0.1 → 20 s - - -
RS Stock No. 518-7102
Mfr. Part No.3UG4632-1AA30
BrandSiemens
$454.89
Each
units
Voltage 24 V ac/dc SPDT Overvoltage, Undervoltage 1 10 → 600 V ac/dc - - - - 0.1 → 20 s - - -
RS Stock No. 175-2273
Mfr. Part No.3RN2010-1BA30
BrandSiemens
$134.41
Each
units
Thermistor motor temperature protection 24 V ac/dc DPDT Motor Voltage - - - - - - - - - -
RS Stock No. 518-7124
Mfr. Part No.3UG4621-1AW30
BrandSiemens
$257.65
Each
units
Current 24 → 240 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 3mA 500mA - 0.1 → 20 s - - -