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 and frequency.


The factor that you need to measure will decide which monitoring relay you choose.

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Part Details Brand Stock Monitoring Application 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 Minimum Operating Temperature Dimensions Mounting Type Terminal Type Width Length Number of Poles Series Height Special Features Operating Temperature Range Minimum Temperature Sensed Minimum Voltage Sensed Maximum Temperature Sensed Maximum Voltage Sensed Minimum Frequency Sensed Current Range Frequency Sensitivity Maximum Operating Temperature
Schneider Electric Current Monitoring Relay
  • EGP 28,857.03
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Schneider Electric Voltage Monitoring Relay, 1 Phase
  • EGP 3,066.04
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Schneider Electric Voltage Monitoring Relay, 3 Phase
  • EGP 3,254.10
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Broyce Control Phase Monitoring Relay, 3 Phase
  • EGP 1,208.71
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Tele Voltage Monitoring Relay With DPDT Contacts, 3 Phase
  • EGP 2,401.72
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  • RS Stock No. 182-9992
  • Brand Tele
  • Mfr. Part No. E3YF400V02 0.85
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Carlo Gavazzi Monitoring Relay With SPDT Contacts, 3 Phase
  • EGP 5,791.30
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Carlo Gavazzi Voltage Monitoring Relay With SPDT Contacts, 3 Phase
  • EGP 5,168.12
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Eaton Phase, Voltage Monitoring Relay
  • EGP 2,346.04
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  • RS Stock No. 179-3516
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  • Mfr. Part No. 184789 & EMR6-F500-G-1
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Eaton Phase, Voltage Monitoring Relay
  • EGP 4,880.85
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  • RS Stock No. 179-3530
  • Brand Eaton
  • Mfr. Part No. 184764 & EMR6-AW500-D-1
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Broyce Control Voltage Monitoring Relay With SPDT Contacts
  • EGP 1,319.22
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Eaton Current Monitoring Relay, 1 Phase
  • EGP 5,119.99
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  • RS Stock No. 179-3518
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  • Mfr. Part No. 184790 & EMR6-I1-A-1
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Eaton Phase, Voltage Monitoring Relay
  • EGP 4,810.66
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  • RS Stock No. 179-3547
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  • Mfr. Part No. 184779 & EMR6-W500-D-1
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Tele Voltage Monitoring Relay With SPDT Contacts, 3 Phase
  • EGP 2,546.76
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  • RS Stock No. 182-9993
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  • Mfr. Part No. E1YF400V01 0.85
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Eaton Level Monitoring Relay
  • EGP 2,658.44
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  • RS Stock No. 179-3521
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  • Mfr. Part No. 184756 & EMR6-N1000-N-1
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Screw Please note that the Stock level on this page is periodically updated during the day.

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110mm Please note that the Stock level on this page is periodically updated during the day.

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23mm Please note that the Stock level on this page is periodically updated during the day.

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- EMR6 Please note that the Stock level on this page is periodically updated during the day.

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85mm Please note that the Stock level on this page is periodically updated during the day.

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- -25 → +60°C Please note that the Stock level on this page is periodically updated during the day.

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- - - - - - - +60°C Please note that the Stock level on this page is periodically updated during the day.

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Carlo Gavazzi Voltage Monitoring Relay With SPDT Contacts, 3 Phase
  • EGP 4,284.13
  • Each
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Carlo Gavazzi Please note that the Stock level on this page is periodically updated during the day.

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3 Please note that the Stock level on this page is periodically updated during the day.

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Voltage Please note that the Stock level on this page is periodically updated during the day.

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SPDT Please note that the Stock level on this page is periodically updated during the day.

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- 3 Please note that the Stock level on this page is periodically updated during the day.

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- - - - - - - - - - - - - - - - PPB02 Please note that the Stock level on this page is periodically updated during the day.

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- - - - - - - - - - -
Eaton Insulation Monitoring Relay
  • EGP 5,704.16
  • Each
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  • RS Stock No. 179-3538
  • Brand Eaton
  • Mfr. Part No. 184772 & EMR6-R250-A-1
Eaton Please note that the Stock level on this page is periodically updated during the day.

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3 Please note that the Stock level on this page is periodically updated during the day.

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Insulation Please note that the Stock level on this page is periodically updated during the day.

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- - - 0 → 250 V ac, 0 → 300V dc Please note that the Stock level on this page is periodically updated during the day.

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- - - - - - - - -25°C Please note that the Stock level on this page is periodically updated during the day.

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22.5 x 109.5 x 78mm Please note that the Stock level on this page is periodically updated during the day.

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DIN Rail Please note that the Stock level on this page is periodically updated during the day.

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Screw Please note that the Stock level on this page is periodically updated during the day.

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109.5mm Please note that the Stock level on this page is periodically updated during the day.

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22.5mm Please note that the Stock level on this page is periodically updated during the day.

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- EMR6 Please note that the Stock level on this page is periodically updated during the day.

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78mm Please note that the Stock level on this page is periodically updated during the day.

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- -25 → +60°C Please note that the Stock level on this page is periodically updated during the day.

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Eaton Level Monitoring Relay
  • EGP 2,587.81
  • Each
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  • RS Stock No. 179-3524
  • Brand Eaton
  • Mfr. Part No. 184758 & EMR6-N100-N-1
Eaton Please note that the Stock level on this page is periodically updated during the day.

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3 Please note that the Stock level on this page is periodically updated during the day.

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Level Please note that the Stock level on this page is periodically updated during the day.

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- - - - - - - - - - - - -25°C Please note that the Stock level on this page is periodically updated during the day.

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23 x 110 x 85mm Please note that the Stock level on this page is periodically updated during the day.

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DIN Rail Please note that the Stock level on this page is periodically updated during the day.

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Screw Please note that the Stock level on this page is periodically updated during the day.

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110mm Please note that the Stock level on this page is periodically updated during the day.

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23mm Please note that the Stock level on this page is periodically updated during the day.

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- EMR6 Please note that the Stock level on this page is periodically updated during the day.

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85mm Please note that the Stock level on this page is periodically updated during the day.

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- -25 → +60°C Please note that the Stock level on this page is periodically updated during the day.

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- - - - - - - +60°C Please note that the Stock level on this page is periodically updated during the day.

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Eaton Phase, Voltage Monitoring Relay
  • EGP 3,754.39
  • Each
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  • RS Stock No. 179-3543
  • Brand Eaton
  • Mfr. Part No. 184776 & EMR6-W300-C-1
Eaton Please note that the Stock level on this page is periodically updated during the day.

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3 Please note that the Stock level on this page is periodically updated during the day.

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Phase, Voltage Please note that the Stock level on this page is periodically updated during the day.

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- - - 160 → 300V ac Please note that the Stock level on this page is periodically updated during the day.

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- - - - 0.1 → 30s Please note that the Stock level on this page is periodically updated during the day.

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- - 50 → 60Hz Please note that the Stock level on this page is periodically updated during the day.

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-25°C Please note that the Stock level on this page is periodically updated during the day.

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22.5 x 109.5 x 78mm Please note that the Stock level on this page is periodically updated during the day.

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DIN Rail Please note that the Stock level on this page is periodically updated during the day.

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Screw Please note that the Stock level on this page is periodically updated during the day.

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109.5mm Please note that the Stock level on this page is periodically updated during the day.

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22.5mm Please note that the Stock level on this page is periodically updated during the day.

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- EMR6 Please note that the Stock level on this page is periodically updated during the day.

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78mm Please note that the Stock level on this page is periodically updated during the day.

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- -25 → +60°C Please note that the Stock level on this page is periodically updated during the day.

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50Hz Please note that the Stock level on this page is periodically updated during the day.

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- - +60°C Please note that the Stock level on this page is periodically updated during the day.

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Phoenix Contact Current Monitoring Relay
  • EGP 7,452.24
  • Each
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Phoenix Contact Please note that the Stock level on this page is periodically updated during the day.

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3 Please note that the Stock level on this page is periodically updated during the day.

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Current Please note that the Stock level on this page is periodically updated during the day.

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- - - - - 0A Please note that the Stock level on this page is periodically updated during the day.

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20A Please note that the Stock level on this page is periodically updated during the day.

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- - - - - -20°C Please note that the Stock level on this page is periodically updated during the day.

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22.5 x 102 x 128.5mm Please note that the Stock level on this page is periodically updated during the day.

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- Screw Please note that the Stock level on this page is periodically updated during the day.

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102mm Please note that the Stock level on this page is periodically updated during the day.

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22.5mm Please note that the Stock level on this page is periodically updated during the day.

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128.5mm Please note that the Stock level on this page is periodically updated during the day.

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- -20 → +70°C Please note that the Stock level on this page is periodically updated during the day.

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- - - - - 50mA Please note that the Stock level on this page is periodically updated during the day.

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- +70°C Please note that the Stock level on this page is periodically updated during the day.

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Schneider Electric Frequency, Voltage with NFC Monitoring Relay, 3 Phase
  • EGP 3,949.72
  • Each
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Schneider Electric Please note that the Stock level on this page is periodically updated during the day.

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3 Please note that the Stock level on this page is periodically updated during the day.

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Frequency, Voltage with NFC Please note that the Stock level on this page is periodically updated during the day.

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- - 3 Please note that the Stock level on this page is periodically updated during the day.

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- - - - - - - - - -20°C Please note that the Stock level on this page is periodically updated during the day.

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- DIN Rail Please note that the Stock level on this page is periodically updated during the day.

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- 22.5mm Please note that the Stock level on this page is periodically updated during the day.

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99mm Please note that the Stock level on this page is periodically updated during the day.

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3 Please note that the Stock level on this page is periodically updated during the day.

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- 90mm Please note that the Stock level on this page is periodically updated during the day.

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- - - - - - - - - +60°C Please note that the Stock level on this page is periodically updated during the day.

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