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. 758-6933
Mfr. Part No.3UG4614-2BR20
BrandSiemens
TWD7,014.00
Each
units
Phase - DPDT - - 160 → 690V ac - - - Phase Failure, Phase Sequence 0.1 → 20s - - -
RS Stock No. 179-3542
Mfr. Part No.184775 & EMR6-RC690
BrandEaton
TWD9,893.00
Each
units
Insulation - - - - 0 → 690V ac - - - - - - - -
RS Stock No. 850-5386
Mfr. Part No.LXPRF-4W 230V (400V)
TWD2,306.00
Each
units
Phase, Voltage - SPDT Undervoltage - - - - - Phase Failure, Phase Sequence - - - -
RS Stock No. 204-8275
Mfr. Part No.TPRPM038
TWD3,514.00
Each
units
Voltage - - - 1, 3 - - - - - - - - -
RS Stock No. 175-2288
Mfr. Part No.3RN2012-2BA30
BrandSiemens
TWD5,891.00
Each
units
Thermistor motor temperature protection - DPDT Motor Voltage - - - - - - - - - -
RS Stock No. 123-9731
Mfr. Part No.K3IM5AACL20 230VAC
BrandTele
TWD6,118.00
Each
units
Current - DPDT - 1 - Overcurrent, Undercurrent - - - - - - -
RS Stock No. 876-5036
Mfr. Part No.1SVR730712R0200 CM-MSS.32S
BrandABB
TWD3,281.00
Each
units
Temperature - DPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
New
RS Stock No. 213-1304
Mfr. Part No.3UG4615-2CR20
BrandSiemens
TWD8,937.00
Each
units
Phase - DPDT - 3 - - - - - - - - -
RS Stock No. 203-3897
Mfr. Part No.3UG4582-1AW30
BrandSiemens
TWD13,506.00
Each
units
Voltage - SPNO - - - - - - - - - - -
RS Stock No. 876-5023
Mfr. Part No.1SVR730712R1400 CM-MSS.31S
BrandABB
TWD5,404.00
Each
units
Temperature - SPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 179-3553
Mfr. Part No.184784 & EMR6-VM600-A-1
BrandEaton
TWD7,706.00
Each
units
Voltage - - - 1 24 → 240V ac/dc - - - - 0.1 → 30s - - -
RS Stock No. 876-4998
Mfr. Part No.1SVR730700R0100 CM-MSS.12S
BrandABB
TWD2,825.00
Each
units
Temperature - SPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 111-3138
Mfr. Part No.K8DT-PM2TN
BrandOmron
TWD4,753.00
Each
units
Phase, Voltage - SPST Overvoltage, Undervoltage 3 - - - - Phase Loss, Phase Sequence 250ms - - -
RS Stock No. 850-5389
Mfr. Part No.LXPRT-4W 230V (400V)
TWD2,622.00
Each
units
Phase, Voltage - SPDT Undervoltage - - - - - Phase Failure, Phase Sequence 0.2 → 10s - - -
RS Stock No. 175-2273
Mfr. Part No.3RN2010-1BA30
BrandSiemens
TWD3,463.00
Each
units
Thermistor motor temperature protection - DPDT Motor Voltage - - - - - - - - - -
RS Stock No. 175-2281
Mfr. Part No.3RN2011-1BA30
BrandSiemens
TWD4,288.00
Each
units
Thermistor motor temperature protection - DPDT Motor Voltage - - - - - - - - - -
RS Stock No. 442-9001
Mfr. Part No.1SVR550882R9500
BrandABB
TWD2,700.00
Each
units
Phase - SPST - 1, 3 - - - - Phase Failure 150ms - - -
RS Stock No. 146-187
Mfr. Part No.RM35UA13MW
TWD5,991.00
Each
units
Voltage - DPDT Overvoltage, Undervoltage - - - - - - 0.3 → 30s - - -
RS Stock No. 465-0671
Mfr. Part No.MK9056N.12 AC50/60Hz 380-500V
BrandDold
TWD3,188.00
Each
units
Phase - DPDT - 3 - - - - Phase Sequence <50ms - - -
RS Stock No. 175-2297
Mfr. Part No.3RN2023-1DW30
BrandSiemens
TWD11,462.00
Each
units
Thermistor motor temperature protection - CO, NO Motor Voltage - 24 → 240V ac/dc - - - - - - - -