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. 261-993
Mfr. Part No.84874320
BrandCrouzet
MYR885.98
Each
units
Speed - SP-NO/NC - - - - - - - 15ms - - -
RS Stock No. 614-9397
Mfr. Part No.84871130
BrandCrouzet
MYR753.11
Each
units
Current - DPDT - 3 - Overcurrent, Undercurrent 0.1A 10A - 0.1 → 3s - - -
RS Stock No. 614-9347
Mfr. Part No.84870700
BrandCrouzet
MYR534.75
Each
units
Level Control - DPDT - - 24 → 240V ac - 10mA 5A - 0.1 → 5s - - 50 → 60Hz
RS Stock No. 262-211
Mfr. Part No.84872152
BrandCrouzet
MYR659.40
Each
units
Voltage - SPDT Overvoltage, Undervoltage 1 65 → 260V ac/dc - - - - 0.1 → 10s - - -
RS Stock No. 261-959
Mfr. Part No.84871122
BrandCrouzet
MYR637.42
Each
units
Current - SP-NO/NC - - - Overcurrent, Undercurrent 2A 20A - 500ms - - -
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. 262-205
Mfr. Part No.84873221
BrandCrouzet
MYR860.49
Each
units
Voltage - 2NO/2NC Overvoltage, Undervoltage 3 96 → 332V ac - - - - 0.3 → 30s - - -
RS Stock No. 262-003
Mfr. Part No.84873026
BrandCrouzet
MYR1,006.33
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 614-9410
Mfr. Part No.84872130
BrandCrouzet
MYR734.61
Each
units
Voltage - DPDT Overvoltage, Undervoltage - - - - - - 0.1 → 3s - - -
RS Stock No. 261-909
Mfr. Part No.84873021
BrandCrouzet
MYR528.28
Each
units
Phase - DPDT - 3 - - - - Phase Failure, Phase Sequence 500ms - - -
RS Stock No. 262-047
Mfr. Part No.84873024
BrandCrouzet
MYR703.97
Each
units
Phase - SP-NO/NC - 3 - - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 10s - - -
RS Stock No. 261-915
Mfr. Part No.84873022
BrandCrouzet
MYR528.28
Each
units
Phase - SPDT - 3 - - - - Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 463-3402
Mfr. Part No.84871030
BrandCrouzet
MYR909.15
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent 0.1A 10A - 0.1 → 3s - - -
RS Stock No. 614-9375
Mfr. Part No.84871120
BrandCrouzet
MYR683.09
Each
units
Current - 2NO/2NC - 3 - Overcurrent, Undercurrent 2mA 500mA - 0.1 → 3s - - -
RS Stock No. 837-7496
Mfr. Part No.84870200
BrandCrouzet
MYR455.76
Each
units
Level Control - SPDT - - - - - - - 0.1 → 5s - - -
RS Stock No. 463-3474
Mfr. Part No.84872030
BrandCrouzet
MYR796.92
Each
units
Voltage - SPDT - 1 - - - - - 0.1 → 3s - - -
RS Stock No. 463-3682
Mfr. Part No.84872024
BrandCrouzet
MYR659.65
Each
units
Voltage - SPDT - - - - - - - 0.1 → 3s - - -
RS Stock No. 262-132
Mfr. Part No.84872140
BrandCrouzet
MYR635.28
Each
units
Voltage - SPDT Overvoltage, Undervoltage 1 9 → 15V dc - - - - 0.1 → 10s - - -
RS Stock No. 262-198
Mfr. Part No.84873220
BrandCrouzet
MYR836.51
Each
units
Voltage - DPDT Overvoltage, Undervoltage 3 194 → 528V ac - - - - 0.3 → 30s - - -
RS Stock No. 463-3373
Mfr. Part No.84871020
BrandCrouzet
MYR794.15
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent 2mA 500mA - 0.1 → 3s - - -