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 707 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. 442-9449
Mfr. Part No.1SVR550871R9500
BrandABB
MYR468.84
Each
units
Phase, Voltage - SPST Overvoltage, Undervoltage 1, 3 320 → 460V ac - - - Phase Failure 500ms - - -
RS Stock No. 518-7174
Mfr. Part No.3UG4615-1CR20
BrandSiemens
MYR1,344.02
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Sequence 0.1 → 20s - - -
RS Stock No. 518-7275
Mfr. Part No.3UG4511-1BP20
BrandSiemens
MYR511.83
Each
units
Phase - DPDT - 3 - - - - Phase Sequence - - - -
RS Stock No. 857-7680
Mfr. Part No.DPA01CM44
MYR993.52
Each
units
Phase, Voltage - SPDT - 3 177 → 550V ac - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 775-7895
Mfr. Part No.1SVR730794R3300 CM-PVS.41S
BrandABB
MYR1,316.23
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 300 → 500V ac - - - Phase Failure, Phase Sequence 0s, 0.1 → 30 s - - 45 → 65Hz
RS Stock No. 442-9405
Mfr. Part No.1SVR550801R9300
BrandABB
MYR309.38
Each
units
Temperature - SPST - 1 - - - - - <100ms Overtemperature, Undertemperature - -
RS Stock No. 146-070
Mfr. Part No.RM35S0MW
MYR1,032.59
Each
units
Speed - SPDT - - - - - - - 0.6 → 60s - - -
RS Stock No. 629-386
Mfr. Part No.M3PPI 300-500vAC
MYR235.39
Each
units
Phase - - - - - - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 859-3285
Mfr. Part No.PPB01CM48
MYR1,254.16
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 CM-MSS.23S
BrandABB
MYR410.27
Each
units
Temperature - DPDT - 1 - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 376-3726
Mfr. Part No.TR4801-02-110/240VAC
BrandTempatron
MYR670.81
Each
units
Speed - SPDT - - - - - - - - - - -
RS Stock No. 463-3654
Mfr. Part No.84871034
BrandCrouzet
MYR1,004.47
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent 0.1A 10A - 0.1 → 3s - - -
RS Stock No. 146-480
Mfr. Part No.RM35TF30
MYR826.32
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 194 → 528V ac - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 262-205
Mfr. Part No.84873221
BrandCrouzet
MYR866.68
Each
units
Voltage - 2NO/2NC Overvoltage, Undervoltage 3 96 → 332V ac - - - - 0.3 → 30s - - -
RS Stock No. 442-9427
Mfr. Part No.1SVR550870R9400
BrandABB
MYR468.84
Each
units
Phase, Voltage - SPST Overvoltage, Undervoltage 1, 3 185 → 265 V ac, 320 → 460V ac - - - NEUTRAL 500ms - - -
RS Stock No. 361-1631
Mfr. Part No.45OFR 230VAC
MYR539.76
Each
units
Frequency - DPDT - 1 - - - - - 200ms - - 40 → 60 Hz, 50 → 70Hz
RS Stock No. 656-6247
Mfr. Part No.IK9055.11 50-50000IPM UH=DC24V Hyst.1-20%
BrandDold
MYR958.54
Each
units
Speed - SPDT - - - - - - - 0.1 → 20s - - -
RS Stock No. 916-0085
Mfr. Part No.PMV20A575
BrandLovato
MYR645.62
Each
units
Voltage - SPDT Self Powered 3 Maximum of 400V ac - - - - 60ms - - -
RS Stock No. 123-9717
Mfr. Part No.E1YM400VS10
BrandTele
MYR862.75
Each
units
Phase, Voltage - SPDT Undervoltage 1, 3 - - - - Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 321-6848
Mfr. Part No.45175 110VAC
MYR519.99
Each
units
Speed - SPDT - - - - - - - 0.5 → 30 min, 0.5 → 30s - - -