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 102-6134
BrandRS PRO
HK$782.10
單位
Current 24 → 230 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 1A 10A - 0.1 → 30 s - - 48 → 63 Hz
RS庫存編號 102-6137
BrandRS PRO
HK$544.53
單位
Phase, Voltage 400 V ac SPDT Overvoltage, Undervoltage 3 300 380 (Undervoltage) V, 420 500 (Overvoltage) V - - - Phase Failure, Phase Sequence 0.2 10 s - - 48 63 Hz
RS庫存編號 102-6135
BrandRS PRO
HK$433.15
單位
Phase, Voltage 280 520 V ac SPDT Undervoltage 3 Maximum of 280 V - - - Phase Failure, Phase Sequence 100 ms - - 48 63 Hz
RS庫存編號 102-6136
BrandRS PRO
HK$455.42
單位
Phase, Voltage 280 520 V ac SPDT Undervoltage 3 300 500 (Undervoltage) V - - - Phase Failure, Phase Sequence 0.2 10 s - - 48 63 Hz
RS庫存編號 102-6130
BrandRS PRO
HK$404.40
單位
Voltage 12 24 V dc SPDT Undervoltage 1 12 24 V dc - - - - 0 30 s - - -
RS庫存編號 102-6131
BrandRS PRO
HK$472.65
單位
Voltage 230 V ac SPDT Overvoltage, Undervoltage 1 173 218 (Undervoltage) V, 242 288 (Overvoltage) V - - - - 0.2 10 s - - 48 63 Hz
RS庫存編號 102-6133
BrandRS PRO
HK$782.10
單位
Voltage 24 230 V ac/dc SPDT Overvoltage, Undervoltage 1 50 500 V - - - - 0.1 30 s - - 48 63 Hz