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 1 - 20 of 31 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. 463-3654
Mfr. Part No.84871034
BrandCrouzet
SGD239.46
Each
units
Current 230 V ac SPDT - 1 - Overcurrent, Undercurrent 0.1mA 10A - 0.1 → 3 s - - -
RS Stock No. 463-3480
Mfr. Part No.84872033
BrandCrouzet
SGD215.04
Each
units
Voltage 120 V ac SPDT - 1 15 → 600 V - - - - 0.1 → 3 s - - -
RS Stock No. 261-909
Mfr. Part No.84873021
BrandCrouzet
SGD153.95
Each
units
Phase 208 → 440 V ac DPDT - 3 - - - - Phase Failure, Phase Sequence 500 ms - - -
RS Stock No. 261-959
Mfr. Part No.84871122
BrandCrouzet
SGD176.89
Each
units
Current 24 → 240 V ac/dc SP-NO/NC - - - Overcurrent, Undercurrent 2A 20A - 500 ms - - -
RS Stock No. 262-205
Mfr. Part No.84873221
BrandCrouzet
SGD244.36
Each
units
Voltage 120 → 277 V ac 2NO/2NC Overvoltage, Undervoltage 3 96 → 332 V ac - - - - 0.3 → 30 s - - -
RS Stock No. 614-9454
Mfr. Part No.84872151
BrandCrouzet
SGD182.88
Each
units
Voltage 24 → 48 V ac/dc SPDT Overvoltage, Undervoltage 1 20 → 80 V ac/dc - - - - 0.1 → 10 s - - -
RS Stock No. 614-9397
Mfr. Part No.84871130
BrandCrouzet
SGD205.70
Each
units
Current 24 → 240 V ac/dc DPDT - 3 - Overcurrent, Undercurrent 0.1A 10A - 0.1 → 3 s - - -
RS Stock No. 463-3373
Mfr. Part No.84871020
BrandCrouzet
SGD228.40
Each
units
Current 24 V dc SPDT - 1 - Overcurrent, Undercurrent 2mA 500mA - 0.1 → 3 s - - -
RS Stock No. 262-025
Mfr. Part No.84873025
BrandCrouzet
SGD236.39
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. 261-993
Mfr. Part No.84874320
BrandCrouzet
SGD238.65
Each
units
Speed 24 → 240 V ac/dc SP-NO/NC - - - - - - - 15 ms - - -
RS Stock No. 463-3402
Mfr. Part No.84871030
BrandCrouzet
SGD248.30
Each
units
Current 24 V dc SPDT - 1 - Overcurrent, Undercurrent 0.1A 10A - 0.1 → 3 s - - -
RS Stock No. 614-9432
Mfr. Part No.84872141
BrandCrouzet
SGD178.48
Each
units
Voltage 24 → 48 V ac/dc SPDT Overvoltage, Undervoltage 1 20 → 80 V ac/dc - - - - 0.1 → 10 s - - -
RS Stock No. 262-047
Mfr. Part No.84873024
BrandCrouzet
SGD191.20
Each
units
Phase 208 → 480 V ac SP-NO/NC - 3 - - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 10 s - - -
RS Stock No. 614-9375
Mfr. Part No.84871120
BrandCrouzet
SGD205.70
Each
units
Current 24 → 240 V ac/dc 2NO/2NC - 3 - Overcurrent, Undercurrent 2mA 500mA - 0.1 → 3 s - - -
RS Stock No. 837-7496
Mfr. Part No.84870200
BrandCrouzet
SGD116.05
Each
units
Level Control 24 → 240 V ac/dc SPDT - - - - - - - 0.1 → 5 s - - -
RS Stock No. 837-7490
Mfr. Part No.84873029
BrandCrouzet
SGD128.69
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. 261-915
Mfr. Part No.84873022
BrandCrouzet
SGD144.45
Each
units
Phase 208 → 480 V ac SPDT - 3 - - - - Phase Failure, Phase Sequence 0.1 → 10 s - - -
RS Stock No. 262-132
Mfr. Part No.84872140
BrandCrouzet
SGD173.51
Each
units
Voltage 12 V dc SPDT Overvoltage, Undervoltage 1 9 → 15 V dc - - - - 0.1 → 10 s - - -
RS Stock No. 614-9347
Mfr. Part No.84870700
BrandCrouzet
SGD135.90
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. 262-003
Mfr. Part No.84873026
BrandCrouzet
SGD289.55
Each
units
Phase, Voltage 220 → 480 V ac DPDT Overvoltage, Undervoltage 3 194 → 528 V - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10 s - - -