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 347-696
製造零件編號FSRST30SLP-110/230VAC
BrandTempatron
HK$648.95
單位
Shaft Rotation Sensor 110 V ac, 230 V ac SPDT - - Maximum of 30 V dc - - - - 1 → 30 s - - 50 → 60 Hz
RS庫存編號 348-150
製造零件編號FSST-110/230VAC
BrandTempatron
HK$841.50
單位
Speed 110 V ac, 230 V ac SPDT - - - - - - - - - - 50 → 60 Hz
RS庫存編號 376-3760
製造零件編號TR4801-03-24VAC/DC
BrandTempatron
HK$1,028.50
單位
Speed 24 V ac/dc SPDT - - - - - - - - - - -
RS庫存編號 376-3726
製造零件編號TR4801-02-110/240VAC
BrandTempatron
HK$856.90
單位
Speed 110 V ac, 230 V ac SPDT - - - - - - - - - - -
RS庫存編號 376-3732
製造零件編號TR4801-03-110/240VAC
BrandTempatron
HK$1,028.50
單位
Speed 110 V ac, 230 V ac SPDT - - - - - - - - - - -
RS庫存編號 376-3710
製造零件編號TR4801-01-110/240VAC
BrandTempatron
HK$1,028.50
單位
Speed 110 V ac, 230 V ac SPDT - - - - - - - - - - -
RS庫存編號 376-3748
製造零件編號TR4801-01-24VAC/DC
BrandTempatron
HK$1,107.41
單位
Speed 24 V ac/dc SPDT - - - - - - - - - - -
RS庫存編號 376-3754
製造零件編號TR4801-02-24VAC/DC
BrandTempatron
HK$1,028.50
單位
Speed 24 V ac/dc SPDT - - - - - - - - - - -