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. 179-3528
Mfr. Part No.EMR6-A500-D-1
BrandEaton
MYR768.81
Each
units
Phase, Voltage 300 500 V ac - - - 300 500 V ac - - - - 0.1 30 s - - 50 60 Hz
RS Stock No. 179-3526
Mfr. Part No.184760 | EMR6-PH45
BrandEaton
MYR47.36
Each
units
- - - - - - - - - - - - - -
RS Stock No. 179-3549
Mfr. Part No.EMR6-IM15-A-1
BrandEaton
MYR1,041.81
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. 102-6139
Mfr. Part No.106943
BrandEaton
MYR1,342.25
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, 15 (B3) A, 5 (B2) A - 0.1 30 s - - -
RS Stock No. 179-3555
Mfr. Part No.EMR6-T50-A-1
BrandEaton
MYR1,069.53
Each
units
Temperature 24 240 V ac/dc - - - - - - - - - - -50 +50°C -
RS Stock No. 179-3520
Mfr. Part No.EMR6-I15-B-1
BrandEaton
MYR818.90
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. 179-3540
Mfr. Part No.EMR6-R400-A-1
BrandEaton
MYR928.10
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
MYR1,223.78
Each
units
Phase, Voltage 350 580 V ac - - - 350 580 V ac - - - - 0.1 30 s - - 50 60 Hz
RS Stock No. 102-6147
Mfr. Part No.221789
BrandEaton
MYR587.92
Each
units
Liquid Level 220 240 V ac SPDT - 1 - - - - - 250 ms - - -
RS Stock No. 179-3535
Mfr. Part No.EMR6-AWN280-K-1
BrandEaton
MYR1,114.58
Each
units
Phase, Voltage 180 280 V ac - - - 180 280 V ac - - - - 0.1 30 s - - 50 60 Hz
RS Stock No. 179-3522
Mfr. Part No.EMR6-N1000-A-1
BrandEaton
MYR718.83
Each
units
Level 24 240 V ac/dc - - - - - - - - 0.1 30 s - - -
RS Stock No. 179-3548
Mfr. Part No.EMR6-IM1-A-1
BrandEaton
MYR1,041.81
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. 179-3521
Mfr. Part No.EMR6-N1000-N-1
BrandEaton
MYR505.05
Each
units
Level 110 130 V ac, 220 240 V ac - - - - - - - - - - - -
RS Stock No. 179-3556
Mfr. Part No.EMR6-T100-A-1
BrandEaton
MYR1,069.53
Each
units
Temperature 24 240 V ac/dc - - - - - - - - - - 0 +100°C -
RS Stock No. 179-3544
Mfr. Part No.EMR6-W380-L-1
BrandEaton
MYR750.96
Each
units
Phase, Voltage 380 V - - - - - - - - 0.1 30 s - - 50 60 Hz
RS Stock No. 179-3541
Mfr. Part No.EMR6-R400-A-2
BrandEaton
MYR2,511.60
Each
units
Insulation 24 240 V ac/dc - - - 0 400 V ac - - - - - - - -
RS Stock No. 179-3516
Mfr. Part No.EMR6-F500-G-1
BrandEaton
MYR486.78
Each
units
Phase, Voltage 200 500 V ac - - - 200 500 V ac - - - - - - - 50 60 Hz
RS Stock No. 179-3529
Mfr. Part No.EMR6-AW300-C-1
BrandEaton
MYR937.23
Each
units
Phase, Voltage 160 300 V ac - - - 160 300 V ac - - - - 0.1 30 s - - 50 60 Hz
RS Stock No. 179-3538
Mfr. Part No.EMR6-R250-A-1
BrandEaton
MYR1,196.48
Each
units
Insulation 24 240 V ac/dc - - - 0 250 V ac, 0 300 V dc - - - - - - - -
RS Stock No. 179-3518
Mfr. Part No.EMR6-I1-A-1
BrandEaton
MYR1,002.32
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 - - -