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 124-0193
製造零件編號RM35LM33MW
HK$643.18
單位
Level 20.4 → 264 V ac/dc DPDT - 1 - - - - - 0.1 → 5 s - - -
RS庫存編號 145-960
製造零件編號RM35LM33MW
HK$774.00
單位
- 20.4 → 264 V ac/dc - - - - - - - - - - - -
RS庫存編號 145-976
製造零件編號RM35JA32MW
HK$1,161.10
單位
Current 24 → 240 V ac/dc DPDT - - - Overcurrent, Undercurrent 0.15A 15A - 0.3 → 30 s - - -
RS庫存編號 146-200
製造零件編號RM35JA31MW
HK$1,204.90
單位
Current 24 → 240 V ac/dc DPDT - - - Overcurrent, Undercurrent 2mA 500mA - 0.3 → 30 s - - -
RS庫存編號 146-480
製造零件編號RM35TF30
HK$2,150.80
單位
Phase, Voltage 220 → 480 V ac DPDT Overvoltage, Undervoltage 3 194 → 528 V ac - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10 s - - -
RS庫存編號 146-238
製造零件編號RM17TG20
HK$751.58
單位
Phase 208 → 440 V ac DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100 ms - - -
RS庫存編號 146-171
製造零件編號RM17UAS15
HK$1,090.00
單位
Voltage 110 → 240 V ac/dc SPDT Overvoltage, Self Powered, Undervoltage 1 65 → 260 V ac/dc - - - - 0.1 → 10 s - - -
RS庫存編號 146-597
製造零件編號RM17TU00
HK$802.77
單位
Phase, Voltage 208 → 480 V ac SPDT Undervoltage 3 183 → 528 V ac - - - Phase Failure, Phase Sequence 0.1 → 10 s - - -
RS庫存編號 146-193
製造零件編號RM35HZ21FM
HK$1,920.00
單位
Frequency 120 → 277 V ac DPDT - - - - - - - 0.1 → 10 s - - 40 → 70 Hz
RS庫存編號 146-070
製造零件編號RM35S0MW
HK$1,922.66
單位
Speed 24 → 240 V ac/dc SPDT - - - - - - - 0.6 → 60 s - - -
RS庫存編號 146-086
製造零件編號RM35BA10
HK$1,523.93
單位
Current, Phase 208 → 480 V ac, 230 V ac SPDT - 1, 3 - Overcurrent, Undercurrent 1A 10A Phase Failure, Phase Sequence 0.1 → 10 s - - -
RS庫存編號 146-468
製造零件編號RM35UB3N30
HK$1,860.00
單位
Voltage 120 → 277 V ac DPDT Absence of Neutral, Overvoltage and Undervoltage Between Neutral, Overvoltage and Undervoltage Between Phase 3 114 → 329 V ac - - - - 0.3 → 30 s - - -
RS庫存編號 146-109
製造零件編號RM35UA11MW
HK$2,008.26
單位
Voltage 24 → 240 V ac/dc DPDT Overvoltage, Undervoltage - 0.05 → 5 V - - - - 0.3 → 30 s - - -
RS庫存編號 146-531
製造零件編號RM17UBE16
HK$1,500.00
單位
Voltage 24 → 48 V ac/dc SPDT Overvoltage, Self Powered, Undervoltage 1 20 → 80 V ac/dc - - - - 0.1 → 10 s - - -
RS庫存編號 776-3657
製造零件編號A9E16066
HK$2,200.00
單位
Time Delay 24 V dc, 24 → 240 V ac SPDT - - 24 → 240 V ac - - - - - - - -
RS庫存編號 609-8081
製造零件編號LT3SM00MW
HK$2,920.00
單位
Temperature 24 → 230 V ac DPDT - - - - - - - - Overtemperature, Undertemperature - -
RS庫存編號 776-3648
製造零件編號A9E16065
HK$2,339.06
單位
Time Delay 24 V dc, 24 → 240 V ac SPDT - - 24 → 240 V ac - - - - - - - -
RS庫存編號 124-0186
製造零件編號RM22UA31MR
HK$1,725.31
單位
Voltage 20.4 → 264 V ac/dc DPDT Overvoltage, Undervoltage 1 50 mV ac/dc → 5 V ac/dc - - - - 0.1 → 30 s - - -
RS庫存編號 179-9431
製造零件編號RM22TA31
HK$1,021.31
單位
Phase 200 → 240 V ac DPDT Overvoltage 3 <100 V ac - - - - 30 s - - -
RS庫存編號 146-474
製造零件編號RM35UB330
HK$1,332.99
單位
Voltage 220 → 480 V ac DPDT Absence of Neutral, Overvoltage and Undervoltage Between Neutral, Overvoltage and Undervoltage Between Phase 3 194 → 528 V ac - - - - 0.3 → 30 s - - -