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 41 - 60 of 707 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. 146-171
Mfr. Part No.RM17UAS15
MYR627.01
Each
units
Voltage - SPDT Overvoltage, Self Powered, Undervoltage 1 65 → 260V ac/dc - - - - 0.1 → 10s - - -
RS Stock No. 146-238
Mfr. Part No.RM17TG20
MYR507.92
Each
units
Phase - DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100ms - - -
RS Stock No. 890-3887
Mfr. Part No.2905597
MYR613.32
Each
units
Voltage - DPDT Undervoltage 3 - - - - Phase Failure, Phase Sequence - - - 48 → 63Hz
RS Stock No. 321-6826
Mfr. Part No.45200 110VAC
MYR453.36
Each
units
Temperature - SPDT - - - - - - - 50ms Overtemperature - -
RS Stock No. 262-003
Mfr. Part No.84873026
BrandCrouzet
MYR1,013.57
Each
units
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 518-7124
Mfr. Part No.3UG4621-1AW30
BrandSiemens
MYR1,048.27
Each
units
Current - SPDT - 1 - Overcurrent, Undercurrent 3mA 500mA - 0.1 → 20s - - -
RS Stock No. 819-3258
Mfr. Part No.K8AKPM1200240VAC
BrandOmron
MYR576.43
Each
units
Phase - SPDT - 3 - - - - Overvoltage, Phase Loss, Phase Sequence, Undervoltage 0.1 → 30s - - -
RS Stock No. 146-597
Mfr. Part No.RM17TU00
MYR602.10
Each
units
Phase, Voltage - SPDT Undervoltage 3 183 → 528V ac - - - Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 801-6224
Mfr. Part No.2866035
MYR792.20
Each
units
Voltage - SPDT Undervoltage 1 0 → 300V ac/dc - - - - 0.2 → 10s - - -
RS Stock No. 146-496
Mfr. Part No.RM17TE00
MYR1,642.67
Each
units
Phase, Voltage - SPDT Overvoltage, Undervoltage 3 183 → 528V ac - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
RS Stock No. 775-7958
Mfr. Part No.1SVR730830R0500 CM-ESS.MS
BrandABB
MYR1,369.28
Each
units
Voltage - DPDT Overvoltage, Undervoltage 1 - - - - - 0 s, 0.1 → 30s - - -
RS Stock No. 876-5033
Mfr. Part No.1SVR730712R2200 CM-MSS.33S
BrandABB
MYR511.62
Each
units
Temperature - DPDT - 1 - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 348-150
Mfr. Part No.FSST-110/230VAC
BrandTempatron
MYR580.65
Each
units
Speed - SPDT - - - - - - - - - - 50 → 60Hz
RS Stock No. 327-7641
Mfr. Part No.IL9151.12 2-450kOHM AC230V 0.2-20S
BrandDold
MYR1,000.03
Each
units
- - - - - - - - - - - - - -
RS Stock No. 876-5045
Mfr. Part No.1SVR730712R1200 CM-MSS.41S
BrandABB
MYR853.57
Each
units
Temperature - DPDT - - - - - - - <100ms Overtemperature, Winding Temperature - -
RS Stock No. 614-9410
Mfr. Part No.84872130
BrandCrouzet
MYR737.01
Each
units
Voltage - DPDT Overvoltage, Undervoltage - - - - - - 0.1 → 3s - - -
RS Stock No. 397-9173
Mfr. Part No.70PCVR 400VAC
MYR814.06
Each
units
Phase, Voltage - 4PDT Overvoltage, Undervoltage 3 Maximum of 400V ac - - - Phase Loss 200ms - - -
RS Stock No. 298-9416
Mfr. Part No.45175 230VAC
MYR519.99
Each
units
Speed - SPDT - - - - - - - 0.5 → 30 min, 0.5 → 30s - - -
RS Stock No. 124-0185
Mfr. Part No.RM22TU21
MYR378.57
Each
units
Phase, Voltage - DPDT Undervoltage 3 200 → 240V ac - - - Phase Failure, Phase Sequence - - - -
RS Stock No. 850-5405
Mfr. Part No.LMCVR-500V 24-230VAC/DC
MYR595.97
Each
units
Voltage - SPDT Overvoltage, Undervoltage - - - - - - 0.1 → 30s - - -