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$1,108.14
單位
Level - DPDT - 1 - - - - - 0.1 → 5s - - -
RS庫存編號 145-976
製造零件編號RM35JA32MW
HK$1,841.60
單位
Current - DPDT - - - Overcurrent, Undercurrent 0.15A 15A - 0.3 → 30s - - -
RS庫存編號 146-200
製造零件編號RM35JA31MW
HK$1,491.31
單位
Current - DPDT - - - Overcurrent, Undercurrent 2mA 500mA - 0.3 → 30s - - -
RS庫存編號 146-171
製造零件編號RM17UAS15
HK$1,460.13
單位
Voltage - SPDT Overvoltage, Self Powered, Undervoltage 1 65 → 260V ac/dc - - - - 0.1 → 10s - - -
RS庫存編號 146-238
製造零件編號RM17TG20
HK$1,057.49
單位
Phase - DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100ms - - -
RS庫存編號 146-597
製造零件編號RM17TU00
HK$1,364.71
單位
Phase, Voltage - SPDT Undervoltage 3 183 → 528V ac - - - Phase Failure, Phase Sequence 0.1 → 10s - - -
RS庫存編號 146-480
製造零件編號RM35TF30
HK$3,296.22
單位
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 194 → 528V ac - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
RS庫存編號 146-193
製造零件編號RM35HZ21FM
HK$2,008.16
單位
Frequency - DPDT - - - - - - - 0.1 → 10s - - 40 → 70Hz
RS庫存編號 146-070
製造零件編號RM35S0MW
HK$2,111.32
單位
Speed - SPDT - - - - - - - 0.6 → 60s - - -
RS庫存編號 144-462
製造零件編號15543
HK$1,106.34
單位
- - SPDT - - - - - - - - - - -
RS庫存編號 146-086
製造零件編號RM35BA10
HK$2,712.65
單位
Current, Phase - SPDT - 1, 3 - Overcurrent, Undercurrent 1A 10A Phase Failure, Phase Sequence 0.1 → 10s - - -
RS庫存編號 146-187
製造零件編號RM35UA13MW
HK$1,511.51
單位
Voltage - DPDT Overvoltage, Undervoltage - - - - - - 0.3 → 30s - - -
RS庫存編號 776-3654
製造零件編號A9E16069
HK$2,814.00
單位
Time Delay - SPDT - - 24 → 240V ac - - - - - - - -
RS庫存編號 609-8081
製造零件編號LT3SM00MW
HK$2,693.91
單位
Temperature - DPDT - - - - - - - - Overtemperature, Undertemperature - -
RS庫存編號 146-608
製造零件編號RM17TT00
HK$1,284.83
單位
Phase - SPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.1 → 10s - - -
RS庫存編號 146-519
製造零件編號RM17UBE15
HK$1,432.19
單位
Voltage - SPDT Overvoltage, Self Powered, Undervoltage 1 65 → 260V ac/dc - - - - 0.1 → 10s - - -
RS庫存編號 609-8075
製造零件編號LT3SM00ED
HK$3,161.13
單位
Temperature - SPDT - - - - - - - - Overtemperature, Undertemperature - -
RS庫存編號 124-0185
製造零件編號RM22TU21
HK$631.03
單位
Phase, Voltage - DPDT Undervoltage 3 200 → 240V ac - - - Phase Failure, Phase Sequence - - - -
RS庫存編號 175-3712
製造零件編號R9PCR
HK$938.19
單位
Current, Voltage - SPDT - 1+N - - - 5A - - - - -
全新
RS庫存編號 212-4766
製造零件編號RM22UA21MR
HK$1,121.65
單位
Voltage - DPDT - 1 - - - - - - - - -