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. 614-9410
Mfr. Part No.84872130
BrandCrouzet
PHP8,205.22
Each
units
Voltage - DPDT Overvoltage, Undervoltage - - - - - - 0.1 → 3s - - -
RS Stock No. 262-003
Mfr. Part No.84873026
BrandCrouzet
PHP16,992.42
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 262-211
Mfr. Part No.84872152
BrandCrouzet
PHP7,654.73
Each
units
Voltage - SPDT Overvoltage, Undervoltage 1 65 → 260V ac/dc - - - - 0.1 → 10s - - -
RS Stock No. 262-205
Mfr. Part No.84873221
BrandCrouzet
PHP9,611.30
Each
units
Voltage - 2NO/2NC Overvoltage, Undervoltage 3 96 → 332V ac - - - - 0.3 → 30s - - -
RS Stock No. 261-959
Mfr. Part No.84871122
BrandCrouzet
PHP7,119.72
Each
units
Current - SP-NO/NC - - - Overcurrent, Undercurrent 2A 20A - 500ms - - -
RS Stock No. 261-915
Mfr. Part No.84873022
BrandCrouzet
PHP6,048.97
Each
units
Phase - SPDT - 3 - - - - Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 262-198
Mfr. Part No.84873220
BrandCrouzet
PHP9,343.44
Each
units
Voltage - DPDT Overvoltage, Undervoltage 3 194 → 528V ac - - - - 0.3 → 30s - - -
RS Stock No. 614-9448
Mfr. Part No.84872142
BrandCrouzet
PHP7,095.82
Each
units
Voltage - SPDT Overvoltage, Undervoltage 1 65 → 260V ac/dc - - - - 0.1 → 10s - - -
RS Stock No. 262-126
Mfr. Part No.84873222
BrandCrouzet
PHP8,545.49
Each
units
Voltage - SPDT Overvoltage, Undervoltage 3 183 → 528V ac - - - - 0.3 → 30s - - -
RS Stock No. 463-3474
Mfr. Part No.84872030
BrandCrouzet
PHP8,901.23
Each
units
Voltage - SPDT - 1 - - - - - 0.1 → 3s - - -
RS Stock No. 261-909
Mfr. Part No.84873021
BrandCrouzet
PHP5,900.64
Each
units
Phase - DPDT - 3 - - - - Phase Failure, Phase Sequence 500ms - - -
RS Stock No. 614-9404
Mfr. Part No.84872120
BrandCrouzet
PHP7,999.23
Each
units
Voltage - DPDT Overvoltage, Undervoltage - - - - - - 0.1 → 3s - - -
RS Stock No. 614-9397
Mfr. Part No.84871130
BrandCrouzet
PHP8,515.74
Each
units
Current - DPDT - 3 - Overcurrent, Undercurrent 0.1A 10A - 0.1 → 3s - - -
RS Stock No. 261-993
Mfr. Part No.84874320
BrandCrouzet
PHP9,896.04
Each
units
Speed - SP-NO/NC - - - - - - - 15ms - - -
RS Stock No. 262-132
Mfr. Part No.84872140
BrandCrouzet
PHP7,095.82
Each
units
Voltage - SPDT Overvoltage, Undervoltage 1 9 → 15V dc - - - - 0.1 → 10s - - -
RS Stock No. 614-9375
Mfr. Part No.84871120
BrandCrouzet
PHP8,411.91
Each
units
Current - 2NO/2NC - 3 - Overcurrent, Undercurrent 2mA 500mA - 0.1 → 3s - - -
RS Stock No. 463-3654
Mfr. Part No.84871034
BrandCrouzet
PHP10,262.24
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent 0.1A 10A - 0.1 → 3s - - -
RS Stock No. 463-3402
Mfr. Part No.84871030
BrandCrouzet
PHP9,981.42
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent 0.1A 10A - 0.1 → 3s - - -
RS Stock No. 837-7490
Mfr. Part No.84873029
BrandCrouzet
PHP5,262.28
Each
units
Phase, Voltage - SPDT Overvoltage 3 183 → 528V ac - - - Phase Failure, Phase Sequence ≤650ms - - -
RS Stock No. 463-3373
Mfr. Part No.84871020
BrandCrouzet
PHP8,870.30
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent 2mA 500mA - 0.1 → 3s - - -