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. 179-3541
Mfr. Part No.EMR6-R400-A-2
BrandEaton
£373.75
Each
Units
Insulation 24 → 240 V ac/dc - - - 0 → 400 V ac - - - - - - - -
New
RS Stock No. 188-3541
Mfr. Part No.LR44/5N 100-230V AC/DC
£53.10
Each
Units
Voltage 100 → 230 V ac/dc 3 x SPNO - - - - - - - - - - -
RS Stock No. 175-2276
Mfr. Part No.3RN2010-1CW30
BrandSiemens
£59.92
Each
Units
Thermistor motor temperature protection 240 V ac/dc SPDT Motor Voltage - 24 → 240 V ac/dc - - - - - - - -
RS Stock No. 165-1485
Mfr. Part No.ACR1252U
£107.64
Each
Units
- 5 V - - - - - - - - - - - -
RS Stock No. 179-3553
Mfr. Part No.EMR6-VM600-A-1
BrandEaton
£86.98
Each
Units
Voltage 24 → 240 V ac/dc - - 1 24 → 240 V ac/dc - - - - 0.1 → 30 s - - -
RS Stock No. 175-2295
Mfr. Part No.3RN2013-2BW30
BrandSiemens
£137.04
Each
Units
Thermistor motor temperature protection 240 V ac/dc DPDT Motor Voltage - 24 → 240 V ac/dc - - - - - - - -
RS Stock No. 181-2768
Mfr. Part No.RN5883.12/61 AC/DC24-80V 10-3000mA 0-10s
BrandDold
£358.35
Each
Units
Residual Current 24 → 80 V ac/dc DPDT - 2 - - 10mA 3000mA - 0 → 10 s - - -
RS Stock No. 111-3121
Mfr. Part No.K8DT-VW3TA
BrandOmron
£90.40
Each
Units
Voltage 100 → 240 V ac SPST Overvoltage, Undervoltage 1 20 → 200 V, 30 → 300 V, 60 → 600 V - - - - 250 ms - - -
RS Stock No. 179-3525
Mfr. Part No.EMR6-PH22
BrandEaton
£7.04
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 175-2281
Mfr. Part No.3RN2011-1BA30
BrandSiemens
£70.92
Each
Units
Thermistor motor temperature protection 24 V ac/dc DPDT Motor Voltage - - - - - - - - - -
RS Stock No. 175-2288
Mfr. Part No.3RN2012-2BA30
BrandSiemens
£97.43
Each
Units
Thermistor motor temperature protection 24 V ac/dc DPDT Motor Voltage - - - - - - - - - -
RS Stock No. 916-0154
Mfr. Part No.PMV70A575
BrandLovato
£93.50
Each
Units
Voltage 380 → 575 V ac SPDT Self Powered 3 Maximum of 400 V ac - - - - 0.1 → 20 s - - -
RS Stock No. 181-2035
Mfr. Part No.2903591
£142.59
Each
Units
Voltage 24 V dc - - - 2 → 10 V dc - - - - - - - -
New
RS Stock No. 188-3544
Mfr. Part No.LR44/3 100-230V AC/DC
£46.58
Each
Units
Voltage 100 → 230 V ac/dc 3 x SPNO - - - - - - - 1 s - - 48 → 63 Hz
RS Stock No. 179-3522
Mfr. Part No.EMR6-N1000-A-1
BrandEaton
£106.97
Each
Units
Level 24 → 240 V ac/dc - - - - - - - - 0.1 → 30 s - - -
RS Stock No. 175-2279
Mfr. Part No.3RN2010-2CA30
BrandSiemens
£52.96
Each
Units
Thermistor motor temperature protection 24 V ac/dc SPDT Motor Voltage - - - - - - - - - -
RS Stock No. 175-2286
Mfr. Part No.3RN2012-1BW30
BrandSiemens
£105.39
Each
Units
Thermistor motor temperature protection 240 V ac/dc DPDT Motor Voltage - 24 → 240 V ac/dc - - - - - - - -
RS Stock No. 181-2032
Mfr. Part No.2901674
£142.51
Each
Units
- 24 V dc - - - - - - - - - - - -
RS Stock No. 179-3535
Mfr. Part No.EMR6-AWN280-K-1
BrandEaton
£93.05
Each
Units
Phase, Voltage 180 → 280 V ac - - - 180 → 280 V ac - - - - 0.1 → 30 s - - 50 → 60 Hz
RS Stock No. 181-2776
Mfr. Part No.MK5880N.38/200 DC24V 5-100kOhm VW10k-5MOhm
BrandDold
£167.11
Each
Units
Insulation 24 V dc 2 x 1CO - - 0 → 500 V ac - - - - - - - -
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