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. 321-6769
Mfr. Part No.45150 110VAC
TWD3,722.00
Each
units
Current - SPDT - 1 - Overcurrent 5mA 1A - 0.1 → 3s - - -
RS Stock No. 775-7983
Mfr. Part No.1SVR730840R0500 CM-SRS.22S
BrandABB
TWD7,480.00
Each
units
Current - DPDT - 1 - Overcurrent, Undercurrent 0.3 A, 1 A, 3A 1.5 A, 5 A, 15A - 0 s, 0.1 → 30s - - 50 → 60Hz
RS Stock No. 465-0744
Mfr. Part No.MK9040N.12/001 3AC50/60Hz 400V
BrandDold
TWD5,929.00
Each
units
Phase - DPDT - 3 - - - - Phase Failure, Phase Imbalance, Phase Sequence <=1 s, <=250ms - - -
RS Stock No. 175-2282
Mfr. Part No.3RN2011-1BW30
BrandSiemens
TWD4,529.00
Each
units
Thermistor motor temperature protection - DPDT Motor Voltage - 24 → 240V ac/dc - - - - - - - -
RS Stock No. 794-3963
Mfr. Part No.MLD4BS
BrandGIC
TWD1,635.00
Each
units
Thermistor - SPDT - 3 - - - 5A - 2 ms, 100 ms, 360 → 550ms - - -
New
RS Stock No. 213-1228
Mfr. Part No.3RS1030-1DW00
BrandSiemens
TWD11,102.00
Each
units
Temperature - - - - - - - - - - - - -
RS Stock No. 445-9068
Mfr. Part No.IL5880.12 AC50-400Hz 220-240V 5-100kOHM
BrandDold
TWD8,081.00
Each
units
Voltage - DPDT - 1, 3 0 → 500V ac - - - - <1.3s - - -
RS Stock No. 175-2269
Mfr. Part No.3RN2000-1AA30
BrandSiemens
TWD2,521.00
Each
units
Thermistor motor temperature protection - SPDT Motor Voltage - - - - - - - - - -
RS Stock No. 175-2289
Mfr. Part No.3RN2012-2BW30
BrandSiemens
TWD6,372.00
Each
units
Thermistor motor temperature protection - DPDT Motor Voltage - 24 → 240V ac/dc - - - - - - - -
RS Stock No. 201-0823
Mfr. Part No.DUB03CW24
TWD6,259.00
Each
units
Voltage - SPDT Overvoltage, Undervoltage 1 - - - - - - - - -
RS Stock No. 819-3282
Mfr. Part No.K8AK-VS2 100-240VAC
BrandOmron
TWD3,878.00
Each
units
Voltage - SPDT Overvoltage, Undervoltage 1 1 → 10 V ac/dc, 3 → 30V ac/dc, 15 → 150 V ac/dc - - - - 0.1 → 30s - - -
RS Stock No. 179-9435
Mfr. Part No.RM22UA23MR
TWD6,289.00
Each
units
Phase - DPDT Overvoltage 1 15 → 500V ac/dc - - - - - - - -
New
RS Stock No. 213-1225
Mfr. Part No.3RR2242-2FA30
BrandSiemens
TWD9,218.00
Each
units
Current - SPDT - 3 - - - - - - - - -
RS Stock No. 203-3903
Mfr. Part No.3UG4621-2AW30
BrandSiemens
TWD7,054.00
Each
units
Current - SPDT - 1 - - - - - - - - -
RS Stock No. 614-9448
Mfr. Part No.84872142
BrandCrouzet
TWD3,803.00
Each
units
Voltage - SPDT Overvoltage, Undervoltage 1 65 → 260V ac/dc - - - - 0.1 → 10s - - -
New
RS Stock No. 213-1223
Mfr. Part No.3RR2242-1FA30
BrandSiemens
TWD9,218.00
Each
units
Current - SPDT - 3 - - - - - - - - -
RS Stock No. 179-3554
Mfr. Part No.184785 & EMR6-VF600-A-1
BrandEaton
TWD7,356.00
Each
units
Voltage - - - 1 24 → 240V ac/dc - - - - 0.1 → 30s - - -
RS Stock No. 876-2554
Mfr. Part No.1SVR560730R3400 CM-UFD.M22
BrandABB
TWD28,646.00
Each
units
Frequency, Voltage - SPDT Overvoltage, Undervoltage 1, 3 - - - - - ±20ms - - 40 → 60Hz
RS Stock No. 775-7924
Mfr. Part No.1SVR750488R8300 CM-MPN.62S
BrandABB
TWD11,274.00
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 450 → 720V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0s, 0.1 → 30 s - - 45 → 65Hz
RS Stock No. 857-7075
Mfr. Part No.DIA53S72420A
TWD5,250.00
Each
units
Current - SPST - 1 - Overcurrent - - - <300ms - - -