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 706 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. 261-959
Mfr. Part No.84871122
BrandCrouzet
€101.27
Each
units
Current - SP-NO/NC - - - Overcurrent, Undercurrent 2A 20A - 500ms - - -
RS Stock No. 518-6086
Mfr. Part No.817-E2
€189.00
Each
units
Temperature - DPST - - - - - - - - Overtemperature - -
RS Stock No. 146-238
Mfr. Part No.RM17TG20
€98.23
Each
units
Phase - DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100ms - - -
RS Stock No. 124-0193
Mfr. Part No.RM35LM33MW
€69.57
Each
units
Level - DPDT - 1 - - - - - 0.1 → 5s - - -
RS Stock No. 614-9347
Mfr. Part No.84870700
BrandCrouzet
€77.74
Each
units
Level Control - DPDT - - 24 → 240V ac - 10mA 5A - 0.1 → 5s - - 50 → 60Hz
RS Stock No. 518-7297
Mfr. Part No.3UG4513-1BR20
BrandSiemens
€129.25
Each
units
Phase, Voltage - DPDT Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20s - - -
RS Stock No. 145-976
Mfr. Part No.RM35JA32MW
€169.93
Each
units
Current - DPDT - - - Overcurrent, Undercurrent 0.15A 15A - 0.3 → 30s - - -
RS Stock No. 518-7051
Mfr. Part No.3UG4614-1BR20
BrandSiemens
€144.76
Each
units
Phase, Voltage - DPDT Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20s - - -
RS Stock No. 857-7075
Mfr. Part No.DIA53S72420A
€47.97
Each
units
Current - SPST - 1 - Overcurrent - - - <300ms - - -
RS Stock No. 775-8040
Mfr. Part No.1SVR740885R1300 CM-MPS.11P
BrandABB
€253.15
Each
units
Phase, Voltage 90 → 170 V ac DPDT Overvoltage, Undervoltage 3 90 → 170 V ac - - - NEUTRAL, Phase Failure, Phase Imbalance, Phase Sequence 0 s, 0.1 → 30 s - - 45 → 65 Hz
RS Stock No. 146-591
Mfr. Part No.RM17TA00
€152.39
Each
units
Phase - SPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 102-6130
BrandRS PRO
€46.75
Each
units
Voltage - SPDT Undervoltage 1 12 → 24V dc - - - - 0 → 30s - - -
RS Stock No. 884-2473
Mfr. Part No.MAC04D0100
BrandGIC
€48.94
Each
units
Phase, Voltage - DPDT Overvoltage Protection, Undervoltage Protection 3 - - - - Neutral Loss, Phase Failure, Phase Reversal, Phase Sequence, Phase Symmetry - - - 47 → 53Hz
RS Stock No. 442-9449
Mfr. Part No.1SVR550871R9500
BrandABB
€78.12
Each
units
Phase, Voltage - SPST Overvoltage, Undervoltage 1, 3 320 → 460V ac - - - Phase Failure 500ms - - -
RS Stock No. 518-7168
Mfr. Part No.3UG4622-1AW30
BrandSiemens
€146.48
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent 50mA 10A - 0.1 → 20s - - -
RS Stock No. 776-1594
Mfr. Part No.72.01.9.024.0000
BrandFinder
€79.54
Each
units
Level - SPDT - 1 - - - - - 0.5 → 7s - - -
RS Stock No. 850-5373
Mfr. Part No.LXPRC 400V
€78.36
Each
units
Phase, Voltage - SPDT Overvoltage, Undervoltage - - - - - Phase Failure 0.2 → 10s - - -
RS Stock No. 146-200
Mfr. Part No.RM35JA31MW
€169.93
Each
units
Current - DPDT - - - Overcurrent, Undercurrent 2mA 500mA - 0.3 → 30s - - -
RS Stock No. 123-9727
Mfr. Part No.V4IM100AL20 24-240V AC/DC
BrandTele
€152.93
Each
units
Current - DPDT - 1 - Overcurrent, Undercurrent - 100A - 0.1 → 10 s, 200ms - - -
RS Stock No. 850-5392
Mfr. Part No.LMCCR-10A 24-230VAC/DC
€98.29
Each
units
Current - SPDT - - - Overcurrent, Undercurrent 0.2A 10A - 0.1 → 30s - - -