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庫存編號 789-2749
製造零件編號70.11.8.230.2022
BrandFinder
TWD3,592.00
單位
Voltage - SPDT Overvoltage Protection, Undervoltage Protection 1 170 → 270V ac - - - - 0.5 → 60s - - 50 → 60Hz
RS庫存編號 776-1575
製造零件編號72.01.8.024.0000
BrandFinder
TWD3,003.00
單位
Level - SPDT - 1 - - - - - 0.5 → 7s - - -
RS庫存編號 788-8642
製造零件編號72.42.0.024.0000
BrandFinder
TWD2,834.00
單位
- - DPST - - - - - - - 0.2 → 20s - - -
RS庫存編號 776-1585
製造零件編號72.01.8.240.0002
BrandFinder
TWD3,154.00
單位
Level - SPDT - 1 - - - - - 0.5 → 7s - - -
RS庫存編號 789-2746
製造零件編號70.41.8.400.2030
BrandFinder
TWD4,192.00
單位
Voltage - SPDT Overvoltage, Undervoltage 3 300 → 480V ac - - - Phase Asymmetry, Phase Loss, Phase Sequence 0.5 → 60s - - 50 → 60Hz
RS庫存編號 789-2755
製造零件編號70.61.8.400.0000
BrandFinder
TWD1,431.00
單位
Voltage - SPDT - 3 - - - - Phase Loss, Phase Sequence 0.5s - - 50 → 60Hz
RS庫存編號 776-1588
製造零件編號72.01.8.125.0000
BrandFinder
TWD2,992.00
單位
Level - SPDT - 1 - - - - - 0.5 → 7s - - -
RS庫存編號 789-2742
製造零件編號70.31.8.400.2022
BrandFinder
TWD4,259.00
單位
Voltage - SPDT Overvoltage Protection, Undervoltage Protection 3 300 → 480V ac - - - Phase Loss, Phase Sequence 0.5 → 60s - - 50 → 60Hz
RS庫存編號 800-2928
製造零件編號70.62.8.400.0000
BrandFinder
TWD3,508.00
單位
Voltage - DPDT - 3 208 → 480V ac - - - Phase Loss, Phase Rotation - - - 50 → 60Hz
RS庫存編號 776-1581
製造零件編號72.01.8.240.0000
BrandFinder
TWD2,753.00
單位
Level - SPDT - 1 - - - - - 0.5 → 7s - - -
RS庫存編號 788-8646
製造零件編號72.42.0.230.0000
BrandFinder
TWD2,834.00
單位
- - DPST - - - - - - - 0.2 → 20s - - -
RS庫存編號 776-1579
製造零件編號72.01.8.024.0002
BrandFinder
TWD3,240.00
單位
Level - SPDT - 1 - - - - - 0.5 → 7s - - -
RS庫存編號 776-1594
製造零件編號72.01.9.024.0000
BrandFinder
TWD2,753.00
單位
Level - SPDT - 1 - - - - - 0.5 → 7s - - -