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 146-250
製造零件編號RM17TG00
TWD3,114.00
單位
Phase 208 → 480 V ac SPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100 ms - - -
RS庫存編號 124-0193
製造零件編號RM35LM33MW
TWD4,877.00
單位
Level 20.4 → 264 V ac/dc DPDT - 1 - - - - - 0.1 → 5 s - - -
RS庫存編號 146-193
製造零件編號RM35HZ21FM
TWD6,565.00
單位
Frequency 120 → 277 V ac DPDT - - - - - - - 0.1 → 10 s - - 40 → 70 Hz
RS庫存編號 124-0184
製造零件編號RM22TR33
TWD4,478.00
單位
Phase, Voltage 304 → 576 V ac DPDT Overvoltage, Undervoltage 3 380 → 480 V ac - - - Phase Failure, Phase Sequence 0.1 → 30 s - - 50 → 60 Hz
RS庫存編號 124-0185
製造零件編號RM22TU21
TWD2,783.00
單位
Phase, Voltage 160 → 288 V ac DPDT Undervoltage 3 200 → 240 V ac - - - Phase Failure, Phase Sequence ≤650 (Run-Up) ms - - -
RS庫存編號 145-976
製造零件編號RM35JA32MW
TWD6,860.00
單位
Current 24 → 240 V ac/dc DPDT - - - Overcurrent, Undercurrent 0.15A 15A - 0.3 → 30 s - - -
RS庫存編號 776-3663
製造零件編號A9E16070
TWD7,392.00
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
TWD17,358.00
單位
Temperature 24 → 230 V ac DPDT - - - - - - - - Overtemperature, Undertemperature - -
RS庫存編號 124-0190
製造零件編號RM22UB34
TWD4,915.00
單位
Voltage 60 → 280 V ac DPDT Overvoltage, Undervoltage 1 80 → 300 V ac/dc - - - - 0.1 → 30 s - - -
RS庫存編號 776-3648
製造零件編號A9E16065
TWD5,777.00
單位
Time Delay 24 V dc, 24 → 240 V ac SPDT - - 24 → 240 V ac - - - - - - - -
RS庫存編號 146-591
製造零件編號RM17TA00
TWD5,306.00
單位
Phase 208 → 480 V ac SPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10 s - - -
RS庫存編號 124-0191
製造零件編號RM35JA32MR
TWD5,441.00
單位
Current 20.4 → 264 V ac/dc DPDT - 1 - Overcurrent, Undercurrent 150mA 15A - 0.1 → 30 s - - -
RS庫存編號 146-070
製造零件編號RM35S0MW
TWD6,430.00
單位
Speed 24 → 240 V ac/dc SPDT - - - - - - - 0.6 → 60 s - - -
RS庫存編號 175-3712
製造零件編號R9PCR
TWD3,990.00
單位
Current, Voltage 250 V ac 1P+N - 1+N - - - 5A - - - - -
RS庫存編號 146-519
製造零件編號RM17UBE15
TWD6,010.00
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 179-9433
製造零件編號RM22TG20
TWD2,248.00
單位
Phase 208 → 480 V ac DPDT Overvoltage 3 <100 V ac - - - Phase Failure, Phase Sequence - - - -
RS庫存編號 146-474
製造零件編號RM35UB330
TWD7,060.00
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 - - -
RS庫存編號 179-9432
製造零件編號RM22TA33
TWD5,231.00
單位
Phase 380 → 480 V ac DPDT Overvoltage 3 <100 V ac - - - - 30 s - - -
RS庫存編號 776-3650
製造零件編號A9E16068
TWD9,229.00
單位
Time Delay 24 V dc, 24 → 240 V ac SPDT - - 24 → 240 V ac - - - - - - - -
RS庫存編號 146-597
製造零件編號RM17TU00
TWD3,732.00
單位
Phase, Voltage 208 → 480 V ac SPDT Undervoltage 3 183 → 528 V ac - - - Phase Failure, Phase Sequence 0.1 → 10 s - - -