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 397-9202
製造零件編號45PUVR-4W 400VAC
HK$927.14
單位
Phase, Voltage - DPDT Undervoltage 3 Maximum of 400V ac - - - Neutral Loss, Phase Loss 200ms - - -
RS庫存編號 261-959
製造零件編號84871122
BrandCrouzet
HK$1,124.37
單位
Current - SP-NO/NC - - - Overcurrent, Undercurrent 2A 20A - 500ms - - -
RS庫存編號 124-0193
製造零件編號RM35LM33MW
HK$1,292.83
單位
Level - DPDT - 1 - - - - - 0.1 → 5s - - -
RS庫存編號 819-3254
製造零件編號K8AKPH1200500VAC
BrandOmron
HK$626.88
單位
Phase - DPDT - 3 - - - - Phase Loss, Phase Sequence 0.1s - - -
RS庫存編號 614-9397
製造零件編號84871130
BrandCrouzet
HK$1,218.57
單位
Current - DPDT - 3 - Overcurrent, Undercurrent 0.1A 10A - 0.1 → 3s - - -
RS庫存編號 850-5395
製造零件編號LXCVR 230V
HK$612.53
單位
Phase, Voltage - SPDT Overvoltage, Undervoltage - - - - - Single Phase 0.2 → 10s - - -
RS庫存編號 518-7168
製造零件編號3UG4622-1AW30
BrandSiemens
HK$1,434.46
單位
Current - SPDT - 1 - Overcurrent, Undercurrent 50mA 10A - 0.1 → 20s - - -
RS庫存編號 463-3654
製造零件編號84871034
BrandCrouzet
HK$1,436.87
單位
Current - SPDT - 1 - Overcurrent, Undercurrent 0.1A 10A - 0.1 → 3s - - -
RS庫存編號 775-7902
製造零件編號1SVR730884R3300 CM-MPS.41S
BrandABB
HK$2,322.66
單位
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 300 → 500V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0s, 0.1 → 30 s - - 45 → 65Hz
RS庫存編號 518-7174
製造零件編號3UG4615-1CR20
BrandSiemens
HK$2,277.50
單位
Phase, Voltage - DPDT Overvoltage, Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Sequence 0.1 → 20s - - -
RS庫存編號 397-9145
製造零件編號70POCR 400VAC
HK$1,841.08
單位
Current - DPDT - 3 - Overcurrent - 5A - 0.2 → 10s - - -
RS庫存編號 775-7974
製造零件編號1SVR730840R0400 CM-SRS.21S
BrandABB
HK$2,006.13
單位
Current - DPDT - 1 - Overcurrent, Undercurrent 0.1 A, 3 mA, 10mA 1 A, 30 mA, 100mA - 0 s, 0.1 → 30s - - 50 → 60Hz
RS庫存編號 775-7942
製造零件編號1SVR730760R0500 CM-SFS.22S
BrandABB
HK$2,283.15
單位
Current - DPDT - 1 - Overcurrent, Undercurrent 0.3 A, 1 A, 3A 1.5 A, 5 A, 15A - 0 s, 0.1 → 30s - - -
RS庫存編號 518-7297
製造零件編號3UG4513-1BR20
BrandSiemens
HK$1,642.99
單位
Phase, Voltage - DPDT Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20s - - -
RS庫存編號 397-9218
製造零件編號45PSR 400VAC
HK$962.28
單位
Phase - SPDT - 3 - - - - Phase Loss, Phase Sequence 200ms - - -
RS庫存編號 614-9448
製造零件編號84872142
BrandCrouzet
HK$1,050.33
單位
Voltage - SPDT Overvoltage, Undervoltage 1 65 → 260V ac/dc - - - - 0.1 → 10s - - -
RS庫存編號 819-3286
製造零件編號K8AK-VS2 24VAC/DC
BrandOmron
HK$1,321.22
單位
Voltage - SPDT Overvoltage, Undervoltage 1 1 → 10 V ac/dc, 3 → 30V ac/dc, 15 → 150 V ac/dc - - - - 0.1 → 30s - - -
RS庫存編號 347-696
製造零件編號FSRST30SLP-110/230VAC
BrandTempatron
HK$811.69
單位
Shaft Rotation Sensor - SPDT - - Maximum of 30V dc - - - - 1 → 30s - - 50 → 60Hz
RS庫存編號 850-5360
製造零件編號LXPRC/S 400V
HK$636.91
單位
Phase, Voltage - SPDT Overvoltage, Undervoltage - - - - - Phase Failure, Phase Sequence 0.2 → 10s - - -
RS庫存編號 775-7970
製造零件編號1SVR730840R0300 CM-SRS.12S
BrandABB
HK$1,940.91
單位
Current - SPDT - 1 - Overcurrent, Undercurrent 0.3 A, 1 A, 3A 1.5 A, 5 A, 15A - - - - -