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 Stock No. 102-6139
Mfr. Part No.106943
BrandEaton
HK$1,917.69
Each
units
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 Stock No. 102-6145
Mfr. Part No.134229
BrandEaton
HK$1,800.12
Each
units
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 Stock No. 179-3530
Mfr. Part No.EMR6-AW500-D-1
BrandEaton
HK$1,683.40
Each
units
Phase, Voltage 300 → 500 V ac - - - 300 → 500 V ac - - - - 0.1 → 30 s - - 50 → 60 Hz
RS Stock No. 179-3528
Mfr. Part No.EMR6-A500-D-1
BrandEaton
HK$1,380.93
Each
units
Phase, Voltage 300 → 500 V ac - - - 300 → 500 V ac - - - - 0.1 → 30 s - - 50 → 60 Hz
RS Stock No. 102-6149
Mfr. Part No.221791
BrandEaton
HK$1,805.55
Each
units
Liquid Level 24 → 240 V ac/dc DPDT - 1 - - - - - 0.1 → 10 s - - -
RS Stock No. 179-3538
Mfr. Part No.EMR6-R250-A-1
BrandEaton
HK$2,149.06
Each
units
Insulation 24 → 240 V ac/dc - - - 0 → 250 V ac, 0 → 300 V dc - - - - - - - -
RS Stock No. 179-3557
Mfr. Part No.EMR6-T200-A-1
BrandEaton
HK$1,920.94
Each
units
Temperature 24 → 240 V ac/dc - - - - - - - - - - 0 → +200°C -
RS Stock No. 179-3542
Mfr. Part No.EMR6-RC690
BrandEaton
HK$2,402.41
Each
units
Insulation 0 → 690 V ac - - - 0 → 690 V ac - - - - - - - -
RS Stock No. 179-3555
Mfr. Part No.EMR6-T50-A-1
BrandEaton
HK$1,920.94
Each
units
Temperature 24 → 240 V ac/dc - - - - - - - - - - -50 → +50°C -
RS Stock No. 179-3541
Mfr. Part No.EMR6-R400-A-2
BrandEaton
HK$4,511.16
Each
units
Insulation 24 → 240 V ac/dc - - - 0 → 400 V ac - - - - - - - -
RS Stock No. 179-3531
Mfr. Part No.EMR6-AWM580-H-1
BrandEaton
HK$2,198.07
Each
units
Phase, Voltage 350 → 580 V ac - - - 350 → 580 V ac - - - - 0.1 → 30 s - - 50 → 60 Hz
RS Stock No. 179-3546
Mfr. Part No.EMR6-W400-M-1
BrandEaton
HK$1,348.82
Each
units
Phase, Voltage 400 V ac - - - - - - - - 0.1 → 30 s - - 50 → 60 Hz
RS Stock No. 179-3548
Mfr. Part No.EMR6-IM1-A-1
BrandEaton
HK$1,871.21
Each
units
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 Stock No. 179-3520
Mfr. Part No.EMR6-I15-B-1
BrandEaton
HK$1,470.85
Each
units
Current 220 → 240 V ac - - 1 - - 0.3 → 1.5 A, 1 → 5 A, 3 → 15 A 1.5 A, 5 A, 15 A - 0.1 → 30 s - - -
RS Stock No. 179-3550
Mfr. Part No.EMR6-IF1-A-1
BrandEaton
HK$1,871.21
Each
units
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 Stock No. 102-6147
Mfr. Part No.221789
BrandEaton
HK$1,022.33
Each
units
Liquid Level 220 → 240 V ac SPDT - 1 - - - - - 250 ms - - -
RS Stock No. 179-3533
Mfr. Part No.EMR6-AWM820-J-1
BrandEaton
HK$2,198.07
Each
units
Phase, Voltage 530 → 820 V ac - - - 530 → 820 V ac - - - - 0.1 → 30 s - - 50 → 60 Hz
RS Stock No. 179-3524
Mfr. Part No.EMR6-N100-N-1
BrandEaton
HK$882.56
Each
units
Level 110 → 130 V ac, 220 → 240 V ac - - - - - - - - - - - -
RS Stock No. 179-3553
Mfr. Part No.EMR6-VM600-A-1
BrandEaton
HK$1,871.21
Each
units
Voltage 24 → 240 V ac/dc - - 1 24 → 240 V ac/dc - - - - 0.1 → 30 s - - -
RS Stock No. 179-3543
Mfr. Part No.EMR6-W300-C-1
BrandEaton
HK$1,658.78
Each
units
Phase, Voltage 160 → 300 V ac - - - 160 → 300 V ac - - - - 0.1 → 30 s - - 50 → 60 Hz