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. 518-7297
Mfr. Part No.3UG4513-1BR20
BrandSiemens
$422.16
Each
units
Phase, Voltage - DPDT Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20s - - -
RS Stock No. 857-7696
Mfr. Part No.DPB01CM48
$519.11
Each
units
Phase, Voltage - SPDT Overvoltage, Undervoltage 3, 3+N 323 → 550V ac - - - Phase Loss, Phase Sequence 1 s, 6s - - -
RS Stock No. 124-0193
Mfr. Part No.RM35LM33MW
$237.68
Each
units
Level - DPDT - 1 - - - - - 0.1 → 5s - - -
RS Stock No. 146-480
Mfr. Part No.RM35TF30
$506.38
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 194 → 528V ac - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 857-7662
Mfr. Part No.DPA51CM44
$364.47
Each
units
Phase - SPDT - 3 177 → 550V ac - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 146-238
Mfr. Part No.RM17TG20
$241.09
Each
units
Phase - DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100ms - - -
RS Stock No. 261-959
Mfr. Part No.84871122
BrandCrouzet
$220.58
Each
units
Current - SP-NO/NC - - - Overcurrent, Undercurrent 2A 20A - 500ms - - -
RS Stock No. 850-5411
Mfr. Part No.LBVR/A 12-24VDC
$107.51
Each
units
Voltage - SPDT Undervoltage - 12 → 24V dc - - - - 0 → 30s - - -
RS Stock No. 850-5405
Mfr. Part No.LMCVR-500V 24-230VAC/DC
$213.24
Each
units
Voltage - SPDT Overvoltage, Undervoltage - - - - - - 0.1 → 30s - - -
RS Stock No. 775-7889
Mfr. Part No.1SVR730784R2300 CM-PSS.31S
BrandABB
$325.09
Each
units
Phase, Voltage - DPDT - 3 342 → 418V ac - - - Phase Failure, Phase Sequence 0s, 0.1 → 30 s - - 45 → 65Hz
RS Stock No. 857-7075
Mfr. Part No.DIA53S72420A
$285.13
Each
units
Current - SPST - 1 - Overcurrent - - - <300ms - - -
RS Stock No. 146-597
Mfr. Part No.RM17TU00
$296.42
Each
units
Phase, Voltage - SPDT Undervoltage 3 183 → 528V ac - - - Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 806-5910
Mfr. Part No.1SVR730660R0100 CM-IWS.1S
BrandABB
$543.98
Each
units
Insulation - SPDT - - 0 → 250 V ac, 0 → 300V dc - - - - - - - -
RS Stock No. 518-7174
Mfr. Part No.3UG4615-1CR20
BrandSiemens
$434.02
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Sequence 0.1 → 20s - - -
RS Stock No. 629-386
Mfr. Part No.M3PPI 300-500vAC
$96.13
Each
units
Phase - - - - - - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 261-909
Mfr. Part No.84873021
BrandCrouzet
$243.98
Each
units
Phase - DPDT - 3 - - - - Phase Failure, Phase Sequence 500ms - - -
RS Stock No. 859-3027
Mfr. Part No.DUA52C724
$250.13
Each
units
Voltage - SPDT Undervoltage - 8 → 28V dc - - - - <200ms - - -
RS Stock No. 857-7680
Mfr. Part No.DPA01CM44
$301.42
Each
units
Phase, Voltage - SPDT - 3 177 → 550V ac - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 776-3648
Mfr. Part No.A9E16065
$237.68
Each
units
Time Delay - SPDT - - 24 → 240V ac - - - - - - - -
RS Stock No. 463-3654
Mfr. Part No.84871034
BrandCrouzet
$309.15
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent 0.1A 10A - 0.1 → 3s - - -