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 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 850-5405
製造零件編號LMCVR-500V 24-230VAC/DC
HK$858.76
單位
Voltage 24 → 230 V ac/dc SPDT Overvoltage, Undervoltage - 2 → 20 V, 5 → 50 V, 10 → 100 V, 20 → 200 V, 50 → 500 V - - - - 0.1 → 30 s - - -
RS庫存編號 397-9189
製造零件編號70PCVR-4W 400VAC
HK$1,210.68
單位
Phase, Voltage 400 V ac 4NO/4NC Overvoltage, Undervoltage 3 Maximum of 400 V ac - - - Neutral Loss, Phase Loss 200 ms - - -
RS庫存編號 850-5360
製造零件編號LXPRC/S 400V
HK$528.56
單位
Phase, Voltage 400 V ac SPDT Overvoltage, Undervoltage - 300 → 380 (Under) V, 420 → 500 (Over) V - - - Phase Failure, Phase Sequence 0.2 → 10 s - - -
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
RS庫存編號 518-7297
製造零件編號3UG4513-1BR20
BrandSiemens
HK$1,073.14
單位
Phase, Voltage 160 → 690 V ac DPDT Undervoltage 3 160 → 690 V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20 s - - -
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 361-1625
製造零件編號45UFR 230VAC
HK$792.62
單位
Frequency 230 V ac DPDT - 1 - - - - - 200 ms - - 40 → 60 Hz, 50 → 70 Hz
RS庫存編號 876-4985
製造零件編號1SVR730720R1400
BrandABB
HK$861.65
單位
Temperature 24 → 240 V ac/dc SPDT - - - - - - - <100 ms Overtemperature, Winding Temperature - -
RS庫存編號 850-5364
製造零件編號LXPRC/S-4W 230V (400V)
HK$679.41
單位
Phase, Voltage 230 V ac SPDT Overvoltage, Undervoltage - 173 → 218 (Under) V, 242 → 288 (Over) V - - - Phase Failure, Phase Sequence 0.2 → 10 s - - -
RS庫存編號 463-3402
製造零件編號84871030
BrandCrouzet
HK$856.02
單位
Current 24 V dc SPDT - 1 - Overcurrent, Undercurrent 0.1A 10A - 0.1 → 3 s - - -
RS庫存編號 819-3201
製造零件編號K8AK-AS1 100-240VAC
BrandOmron
HK$822.25
單位
Current 100 → 240 V ac SPDT - 1 - Overcurrent, Undercurrent 2 500mA - - - - -
RS庫存編號 819-3305
製造零件編號K8AK-VW3 100-240VAC
BrandOmron
HK$980.47
單位
Voltage 100 → 240 V ac SPDT Overvoltage, Undervoltage 1 20 → 200 V ac/dc, 30 → 300 V ac/dc, 60 → 600 V ac/dc - - - - 0.1 → 30 s - - -
RS庫存編號 614-9347
製造零件編號84870700
BrandCrouzet
HK$794.35
單位
Level Control 24 → 240 V ac/dc DPDT - - 24 → 240 V ac - 10mA 5A - 0.1 → 5 s - - 50 → 60 Hz
RS庫存編號 857-7662
製造零件編號DPA51CM44
HK$1,397.07
單位
Phase 208 → 480 V ac SPDT - 3 177 → 550 V ac - - - Phase Loss, Phase Sequence - - - -
RS庫存編號 538-3805
製造零件編號P48SMP 1-30SEC 115/230VAC
HK$774.03
單位
Current 115 V ac, 230 V ac SPDT - - - - - - - 1 → 30 s, 2 → 60 s - - -
RS庫存編號 801-6218
製造零件編號2866022
HK$2,088.64
單位
Current 24 → 240 V ac/dc DPDT - 1 - Overcurrent, Undercurrent 0A 0.1 A, 1 A, 10 A - 0.1 → 10 s - - -
RS庫存編號 794-3935
製造零件編號MA51BC
BrandGIC
HK$293.43
單位
Voltage 415 V ac SPDT - 3 - - - 5A - 2 s, 7 s - - -
RS庫存編號 102-6139
製造零件編號106943
BrandEaton
HK$1,917.69
單位
Current 24 → 240 V ac/dc DPDT - 1 - Overcurrent, Undercurrent 0.3 (B1) A, 1 (B2) A, 3 (B3) A 1.5 (B1) A, 5 (B2) A, 15 (B3) A - 0.1 → 30 s - - -
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 - - -