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 361-1619
製造零件編號45051 24/115/230VAC
HK$748.03
單位
Voltage 24 V ac, 115 V ac, 230 V ac SPDT Overvoltage, Undervoltage 1 Maximum of 230 V ac - - - - 0.1 → 10 s - - -
RS庫存編號 397-9202
製造零件編號45PUVR-4W 400VAC
HK$809.62
單位
Phase, Voltage 400 V ac DPDT Undervoltage 3 Maximum of 400 V ac - - - Neutral Loss, Phase Loss 200 ms - - -
RS庫存編號 261-959
製造零件編號84871122
BrandCrouzet
HK$820.61
單位
Current 24 → 240 V ac/dc SP-NO/NC - - - Overcurrent, Undercurrent 2A 20A - 500 ms - - -
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 614-9397
製造零件編號84871130
BrandCrouzet
HK$1,034.55
單位
Current 24 → 240 V ac/dc DPDT - 3 - Overcurrent, Undercurrent 0.1A 10A - 0.1 → 3 s - - -
RS庫存編號 819-3254
製造零件編號K8AKPH1200500VAC
BrandOmron
HK$551.58
單位
Phase 200 → 480 V ac DPDT - 3 - - - - Phase Loss, Phase Sequence 0.1 s - - -
RS庫存編號 518-7168
製造零件編號3UG4622-1AW30
BrandSiemens
HK$1,225.47
單位
Current 24 → 240 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 50mA 10A - 0.1 → 20 s - - -
RS庫存編號 850-5395
製造零件編號LXCVR 230V
HK$472.65
單位
Phase, Voltage 230 V ac SPDT Overvoltage, Undervoltage - 173 → 218 (Under) V, 242 → 288 (Over) V - - - Single Phase 0.2 → 10 s - - -
RS庫存編號 463-3654
製造零件編號84871034
BrandCrouzet
HK$942.39
單位
Current 230 V ac SPDT - 1 - Overcurrent, Undercurrent 0.1mA 10A - 0.1 → 3 s - - -
RS庫存編號 775-7974
製造零件編號1SVR730840R0400
BrandABB
HK$1,748.46
單位
Current 24 → 240 V ac/dc DPDT - 1 - Overcurrent, Undercurrent 0.1 A, 3 mA, 10 mA 1 A, 30 mA, 100 mA - 0 s, 0.1 → 30 s - - 50 → 60 Hz
RS庫存編號 397-9145
製造零件編號70POCR 400VAC
HK$1,304.22
單位
Current 400 V ac DPDT - 3 - Overcurrent - 5A - 0.2 → 10 s - - -
RS庫存編號 775-7902
製造零件編號1SVR730884R3300
BrandABB
HK$1,865.63
單位
Phase, Voltage 300 → 500 V ac DPDT Overvoltage, Undervoltage 3 300 → 500 V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0 s, 0.1 → 30 s - - 45 → 65 Hz
RS庫存編號 518-7174
製造零件編號3UG4615-1CR20
BrandSiemens
HK$1,616.07
單位
Phase, Voltage 160 → 690 V ac DPDT Overvoltage, Undervoltage 3 160 → 690 V ac - - - Phase Failure, Phase Sequence 0.1 → 20 s - - -
RS庫存編號 775-7942
製造零件編號1SVR730760R0500
BrandABB
HK$1,950.00
單位
Current 24 → 240 V ac/dc DPDT - 1 - Overcurrent, Undercurrent 0.3 A, 1 A, 3 A 1.5 A, 5 A, 15 A - 0 s, 0.1 → 30 s - - -
RS庫存編號 614-9448
製造零件編號84872142
BrandCrouzet
HK$763.86
單位
Voltage 110 → 240 V ac/dc SPDT Overvoltage, Undervoltage 1 65 → 260 V ac/dc - - - - 0.1 → 10 s - - -
RS庫存編號 819-3286
製造零件編號K8AK-VS2 24VAC/DC
BrandOmron
HK$908.37
單位
Voltage 24 V ac/dc SPDT Overvoltage, Undervoltage 1 1 → 10 V ac/dc, 3 → 30 V ac/dc, 15 → 150 V ac/dc - - - - 0.1 → 30 s - - -
RS庫存編號 775-7970
製造零件編號1SVR730840R0300
BrandABB
HK$1,650.00
單位
Current 24 → 240 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 0.3 A, 1 A, 3 A 1.5 A, 5 A, 15 A - - - - -
RS庫存編號 914-4654
製造零件編號ICV 230Vac
BrandHiquel
HK$910.56
單位
Voltage 230 V ac DPDT Overvoltage, Undervoltage 1 0 → 10 (E1-M) V, 0 → 45 (E2-M) V, 0 → 450 (E3-M) V - - - - - - - -
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