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 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 102-6145
製造零件編號134229
BrandEaton
HK$1,800.12
單位
Phase, Voltage 400 V ac DPDT Overvoltage, Undervoltage 3 Maximum of 360 (Undervoltage) V ac, Maximum of 440 (Overvoltage) V ac - - - Phase Failure, Phase Sequence 0.1 → 30 s - - -
RS庫存編號 102-6142
製造零件編號134222
BrandEaton
HK$1,839.11
單位
Phase 300 → 500 V ac DPDT - 3 - - - - - 0.1 → 30 s - - -
RS庫存編號 179-3544
製造零件編號EMR6-W380-L-1
BrandEaton
HK$1,348.82
單位
Phase, Voltage 380 V - - - - - - - - 0.1 → 30 s - - 50 → 60 Hz
RS庫存編號 179-3522
製造零件編號EMR6-N1000-A-1
BrandEaton
HK$1,291.13
單位
Level 24 → 240 V ac/dc - - - - - - - - 0.1 → 30 s - - -
RS庫存編號 179-3537
製造零件編號EMR6-AWN500-D-1
BrandEaton
HK$1,961.13
單位
Phase, Voltage 300 → 500 V ac - - - 300 → 500 V ac - - - - 0.1 → 30 s - - 50 → 60 Hz
RS庫存編號 179-3546
製造零件編號EMR6-W400-M-1
BrandEaton
HK$1,348.82
單位
Phase, Voltage 400 V ac - - - - - - - - 0.1 → 30 s - - 50 → 60 Hz
RS庫存編號 179-3553
製造零件編號EMR6-VM600-A-1
BrandEaton
HK$1,871.21
單位
Voltage 24 → 240 V ac/dc - - 1 24 → 240 V ac/dc - - - - 0.1 → 30 s - - -
RS庫存編號 179-3554
製造零件編號EMR6-VF600-A-1
BrandEaton
HK$1,871.21
單位
Voltage 24 → 240 V ac/dc - - 1 24 → 240 V ac/dc - - - - 0.1 → 30 s - - -
RS庫存編號 179-3556
製造零件編號EMR6-T100-A-1
BrandEaton
HK$1,920.94
單位
Temperature 24 → 240 V ac/dc - - - - - - - - - - 0 → +100°C -
RS庫存編號 179-3547
製造零件編號EMR6-W500-D-1
BrandEaton
HK$1,658.78
單位
Phase, Voltage 300 → 500 V ac - - - 300 → 500 V ac - - - - 0.1 → 30 s - - 50 → 60 Hz
RS庫存編號 179-3527
製造零件編號EMR6-A300-C-1
BrandEaton
HK$1,552.68
單位
Phase, Voltage 160 → 300 V ac - - - 160 → 300 V ac - - - - 0.1 → 30 s - - 50 → 60 Hz
RS庫存編號 179-3524
製造零件編號EMR6-N100-N-1
BrandEaton
HK$882.56
單位
Level 110 → 130 V ac, 220 → 240 V ac - - - - - - - - - - - -
RS庫存編號 179-3538
製造零件編號EMR6-R250-A-1
BrandEaton
HK$2,149.06
單位
Insulation 24 → 240 V ac/dc - - - 0 → 250 V ac, 0 → 300 V dc - - - - - - - -
RS庫存編號 179-3542
製造零件編號EMR6-RC690
BrandEaton
HK$2,402.41
單位
Insulation 0 → 690 V ac - - - 0 → 690 V ac - - - - - - - -
RS庫存編號 179-3549
製造零件編號EMR6-IM15-A-1
BrandEaton
HK$1,871.21
單位
Current 24 → 240 V ac/dc - - 1 - - 0.003 A, 0.01 A, 0.1 A 0.03 A, 0.1 A, 1 A - 0.1 → 30 s - - -
RS庫存編號 179-3516
製造零件編號EMR6-F500-G-1
BrandEaton
HK$874.35
單位
Phase, Voltage 200 → 500 V ac - - - 200 → 500 V ac - - - - - - - 50 → 60 Hz
RS庫存編號 179-3533
製造零件編號EMR6-AWM820-J-1
BrandEaton
HK$2,198.07
單位
Phase, Voltage 530 → 820 V ac - - - 530 → 820 V ac - - - - 0.1 → 30 s - - 50 → 60 Hz
RS庫存編號 179-3529
製造零件編號EMR6-AW300-C-1
BrandEaton
HK$1,683.40
單位
Phase, Voltage 160 → 300 V ac - - - 160 → 300 V ac - - - - 0.1 → 30 s - - 50 → 60 Hz
RS庫存編號 179-3543
製造零件編號EMR6-W300-C-1
BrandEaton
HK$1,658.78
單位
Phase, Voltage 160 → 300 V ac - - - 160 → 300 V ac - - - - 0.1 → 30 s - - 50 → 60 Hz