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. 261-959
Mfr. Part No.84871122
BrandCrouzet
$179.08
Each
units
Current 24 → 240 V ac/dc SP-NO/NC - - - Overcurrent, Undercurrent 2A 20A - 500 ms - - -
RS Stock No. 261-909
Mfr. Part No.84873021
BrandCrouzet
$148.41
Each
units
Phase 208 → 440 V ac DPDT - 3 - - - - Phase Failure, Phase Sequence 500 ms - - -
RS Stock No. 463-3654
Mfr. Part No.84871034
BrandCrouzet
$171.53
Each
units
Current 230 V ac SPDT - 1 - Overcurrent, Undercurrent 0.1mA 10A - 0.1 → 3 s - - -
RS Stock No. 261-993
Mfr. Part No.84874320
BrandCrouzet
$243.74
Each
units
Speed 24 → 240 V ac/dc SP-NO/NC - - - - - - - 15 ms - - -
RS Stock No. 614-9347
Mfr. Part No.84870700
BrandCrouzet
$227.82
Each
units
Level Control 24 → 240 V ac/dc DPDT - - 24 → 240 V ac - 10mA 5A - 0.1 → 5 s - - 50 → 60 Hz
RS Stock No. 463-3402
Mfr. Part No.84871030
BrandCrouzet
$171.53
Each
units
Current 24 V dc SPDT - 1 - Overcurrent, Undercurrent 0.1A 10A - 0.1 → 3 s - - -
RS Stock No. 614-9397
Mfr. Part No.84871130
BrandCrouzet
$239.34
Each
units
Current 24 → 240 V ac/dc DPDT - 3 - Overcurrent, Undercurrent 0.1A 10A - 0.1 → 3 s - - -
RS Stock No. 614-9432
Mfr. Part No.84872141
BrandCrouzet
$171.22
Each
units
Voltage 24 → 48 V ac/dc SPDT Overvoltage, Undervoltage 1 20 → 80 V ac/dc - - - - 0.1 → 10 s - - -
RS Stock No. 463-3452
Mfr. Part No.84872020
BrandCrouzet
$196.34
Each
units
Voltage 24 V dc SPDT - 1 0.2 → 60 V - - - - 0.1 → 3 s - - -
RS Stock No. 614-9448
Mfr. Part No.84872142
BrandCrouzet
$208.16
Each
units
Voltage 110 → 240 V ac/dc SPDT Overvoltage, Undervoltage 1 65 → 260 V ac/dc - - - - 0.1 → 10 s - - -
RS Stock No. 262-025
Mfr. Part No.84873025
BrandCrouzet
$227.48
Each
units
Phase, Voltage 208 → 480 V ac SPDT Overvoltage, Undervoltage 3 183 → 528 V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 10 s - - -
RS Stock No. 262-205
Mfr. Part No.84873221
BrandCrouzet
$237.38
Each
units
Voltage 120 → 277 V ac 2NO/2NC Overvoltage, Undervoltage 3 96 → 332 V ac - - - - 0.3 → 30 s - - -
RS Stock No. 262-047
Mfr. Part No.84873024
BrandCrouzet
$185.22
Each
units
Phase 208 → 480 V ac SP-NO/NC - 3 - - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 10 s - - -
RS Stock No. 262-132
Mfr. Part No.84872140
BrandCrouzet
$157.63
Each
units
Voltage 12 V dc SPDT Overvoltage, Undervoltage 1 9 → 15 V dc - - - - 0.1 → 10 s - - -
RS Stock No. 463-3648
Mfr. Part No.84871024
BrandCrouzet
$164.96
Each
units
Current 230 V ac SPDT - 1 - Overcurrent, Undercurrent 2mA 500mA - 0.1 → 3 s - - -
RS Stock No. 614-9404
Mfr. Part No.84872120
BrandCrouzet
$177.56
Each
units
Voltage 24 → 240 V ac/dc DPDT Overvoltage, Undervoltage - 0.2 → 60 V - - - - 0.1 → 3 s - - -
RS Stock No. 837-7490
Mfr. Part No.84873029
BrandCrouzet
$119.29
Each
units
Phase, Voltage 3 x 208 → 3 x 480 V ac SPDT Overvoltage 3 183 → 528 V ac - - - Phase Failure, Phase Sequence ≤650 ms - - -
RS Stock No. 262-211
Mfr. Part No.84872152
BrandCrouzet
$170.03
Each
units
Voltage 110 → 240 V ac/dc SPDT Overvoltage, Undervoltage 1 65 → 260 V ac/dc - - - - 0.1 → 10 s - - -
RS Stock No. 614-9454
Mfr. Part No.84872151
BrandCrouzet
$209.53
Each
units
Voltage 24 → 48 V ac/dc SPDT Overvoltage, Undervoltage 1 20 → 80 V ac/dc - - - - 0.1 → 10 s - - -
RS Stock No. 614-9410
Mfr. Part No.84872130
BrandCrouzet
$259.43
Each
units
Voltage 24 → 240 V ac/dc DPDT Overvoltage, Undervoltage - 15 → 600 V - - - - 0.1 → 3 s - - -