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.


...
Read more Read less

Filters

Viewing 21 - 40 of 709 products
Results per page
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. 262-211
Mfr. Part No.84872152
BrandCrouzet
MYR596.14
Each
units
Voltage - SPDT Overvoltage, Undervoltage 1 65 → 260V ac/dc - - - - 0.1 → 10s - - -
RS Stock No. 518-7297
Mfr. Part No.3UG4513-1BR20
BrandSiemens
MYR634.27
Each
units
Phase, Voltage - DPDT Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20s - - -
RS Stock No. 240-8945
Mfr. Part No.BA9043/001 3AC50-400Hz 400V
BrandDold
MYR1,402.83
Each
units
Voltage - DPDT Undervoltage 3 - - - - - - - - -
RS Stock No. 397-9145
Mfr. Part No.70POCR 400VAC
MYR888.71
Each
units
Current - DPDT - 3 - Overcurrent - 5A - 0.2 → 10s - - -
RS Stock No. 261-959
Mfr. Part No.84871122
BrandCrouzet
MYR565.59
Each
units
Current - SP-NO/NC - - - Overcurrent, Undercurrent 2A 20A - 500ms - - -
RS Stock No. 758-6924
Mfr. Part No.3UG4512-1AR20
BrandSiemens
MYR696.25
Each
units
Phase - SPDT - - 160 → 690V ac - - - Phase Failure, Phase Sequence - - - -
RS Stock No. 876-5023
Mfr. Part No.1SVR730712R1400
BrandABB
MYR788.97
Each
units
Temperature - SPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 518-7174
Mfr. Part No.3UG4615-1CR20
BrandSiemens
MYR1,341.87
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Sequence 0.1 → 20s - - -
RS Stock No. 442-9449
Mfr. Part No.1SVR550871R9500
BrandABB
MYR406.14
Each
units
Phase, Voltage - SPST Overvoltage, Undervoltage 1, 3 320 → 460V ac - - - Phase Failure 500ms - - -
RS Stock No. 775-7895
Mfr. Part No.1SVR730794R3300
BrandABB
MYR1,208.32
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 300 → 500V ac - - - Phase Failure, Phase Sequence 0.1 → 30 s, 0s - - 45 → 65Hz
RS Stock No. 857-7680
Mfr. Part No.DPA01CM44
MYR906.32
Each
units
Phase, Voltage - SPDT - 3 177 → 550V ac - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 518-7275
Mfr. Part No.3UG4511-1BP20
BrandSiemens
MYR464.07
Each
units
Phase - DPDT - 3 - - - - Phase Sequence - - - -
RS Stock No. 146-070
Mfr. Part No.RM35S0MW
MYR945.88
Each
units
Speed - SPDT - - - - - - - 0.6 → 60s - - -
RS Stock No. 442-9405
Mfr. Part No.1SVR550801R9300
BrandABB
MYR298.23
Each
units
Temperature - SPST - 1 - - - - - <100ms Overtemperature, Undertemperature - -
RS Stock No. 629-386
Mfr. Part No.M3PPI 300-500vAC
MYR235.39
Each
units
Phase - - - - - - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 463-3654
Mfr. Part No.84871034
BrandCrouzet
MYR892.66
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent 0.1A 10A - 0.1 → 3s - - -
RS Stock No. 376-3726
Mfr. Part No.TR4801-02-110/240VAC
BrandTempatron
MYR564.49
Each
units
Speed - SPDT - - - - - - - - - - -
RS Stock No. 146-480
Mfr. Part No.RM35TF30
MYR945.40
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 194 → 528V ac - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 859-3285
Mfr. Part No.PPB01CM48
MYR1,067.94
Each
units
Phase, Voltage - SPDT Overvoltage, Undervoltage 3, 3+N 323 → 475V ac - - - Phase Loss, Phase Sequence 1 s, 6s - - -
RS Stock No. 876-5011
Mfr. Part No.1SVR730700R2200
BrandABB
MYR390.21
Each
units
Temperature - DPDT - 1 - - - - - <100ms Overtemperature, Winding Temperature - -