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 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 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 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 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 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 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 614-9375
製造零件編號84871120
BrandCrouzet
HK$1,143.45
單位
Current 24 → 240 V ac/dc 2NO/2NC - 3 - Overcurrent, Undercurrent 2mA 500mA - 0.1 → 3 s - - -
RS庫存編號 463-3373
製造零件編號84871020
BrandCrouzet
HK$1,024.31
單位
Current 24 V dc SPDT - 1 - Overcurrent, Undercurrent 2mA 500mA - 0.1 → 3 s - - -
RS庫存編號 262-211
製造零件編號84872152
BrandCrouzet
HK$984.43
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 261-909
製造零件編號84873021
BrandCrouzet
HK$714.86
單位
Phase 208 → 440 V ac DPDT - 3 - - - - Phase Failure, Phase Sequence 500 ms - - -
RS庫存編號 614-9432
製造零件編號84872141
BrandCrouzet
HK$871.50
單位
Voltage 24 → 48 V ac/dc SPDT Overvoltage, Undervoltage 1 20 → 80 V ac/dc - - - - 0.1 → 10 s - - -
RS庫存編號 262-031
製造零件編號84873027
BrandCrouzet
HK$1,441.00
單位
Phase, Temperature 24 → 240 V ac/dc 2NO - 3 208 → 480 V ac - - - Phase Failure, Phase Sequence 300 ms Overtemperature, Undertemperature - -
RS庫存編號 262-126
製造零件編號84873222
BrandCrouzet
HK$1,055.45
單位
Voltage 208 → 480 V ac SPDT Overvoltage, Undervoltage 3 183 → 528 V ac - - - - 0.3 → 30 s - - -
RS庫存編號 261-993
製造零件編號84874320
BrandCrouzet
HK$1,294.74
單位
Speed 24 → 240 V ac/dc SP-NO/NC - - - - - - - 15 ms - - -
RS庫存編號 262-205
製造零件編號84873221
BrandCrouzet
HK$1,453.08
單位
Voltage 120 → 277 V ac 2NO/2NC Overvoltage, Undervoltage 3 96 → 332 V ac - - - - 0.3 → 30 s - - -
RS庫存編號 262-025
製造零件編號84873025
BrandCrouzet
HK$949.41
單位
Phase, Voltage 208 → 480 V ac SPDT Overvoltage, Undervoltage 3 183 → 528 V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 10 s - - -
RS庫存編號 463-3452
製造零件編號84872020
BrandCrouzet
HK$1,233.98
單位
Voltage 24 V dc SPDT - 1 0.2 → 60 V - - - - 0.1 → 3 s - - -
RS庫存編號 614-9410
製造零件編號84872130
BrandCrouzet
HK$1,012.00
單位
Voltage 24 → 240 V ac/dc DPDT Overvoltage, Undervoltage - 15 → 600 V - - - - 0.1 → 3 s - - -
RS庫存編號 463-3682
製造零件編號84872024
BrandCrouzet
HK$1,135.75
單位
Voltage 230 V ac SPDT - 1 0.2 → 60 V - - - - 0.1 → 3 s - - -
RS庫存編號 261-971
製造零件編號84872501
BrandCrouzet
HK$1,441.00
單位
Frequency 120 → 277 V ac DP-NO/NC - - - - - - - 0.1 → 10 s - - 40 → 70 Hz