Wire Break Detection

Overview

The MR-4C / MR-4D / MR-4L / MR-4P Line Monitoring (Wirebreak) Relay is a supervisory module which continually monitors the status of the field wiring by monitoring the current passing through the supervised loop. Each loop has a End-Of-Line Resistor (EOLR) placed at the end of the loop. When the wire in any of the four channel breaks, the current flowing through the loop is disrupted and the module detects this as a open-circuit fault and energizes the fault relay(s). 

Especially useful for systems which uses Normally Open (N/O) Pushbuttons. The MR-4x Wirebreak Detection Module is easy to interface to your existing circuit. 

More than 20,000 in use worldwide!

 

Features

  • Input Voltage: 24 VDC
  • Number of Monitored Channels/Loops: 4
  • End-of-Line Resistor: 4.7 k-ohm (supplied)
  • Individual Fault Indicator allows for easy location of faults.
  • Output Relay Contact: 3A @ 240VAC (resistive)
  • DIN-Rail Mountable

 

Applications

The MR-4C / MR-4D / MR-4L / MR-4P is commonly used to monitor signal loop continuity for applications such as:

  • Monitoring of Normally Open (N/O) Emergency Stop Push-buttons
  • Monitoring of Smoke Detectors
  • Monitoring health of Solenoid Coil
  • E-Stop Panels
  • Electrical Switch Boards
  • and more...

 

Connection Diagram (MR-4C)

MR-4C Wirebreak Monitoring Relay - Connection Diagram

 

Connection Diagram (MR-4D)

MR-4D Wirebreak Monitoring Relay - Connection Diagram

 

Connection Diagram (MR-4L)

MR-4L Wirebreak Monitoring Relay - Connection Diagram

 

Connection Diagram (MR-4P)

MR-4P Wirebreak Monitoring Relay - Connection Diagram

 

 

 

Specifications

 MR-4CMR-4DMR-4PMR-4L
Supply Voltage 24 VDC
Power Consumption 110 mA (max)
Ambient Operating Temperature -10 to +50 degC
Monitoring Channels 4 Circuits (each with 4k7 End-of-Line resistor). Individual fault LED allows for easy location of faults.
Output Contact * 4 x N/C Relay Contacts (NC1, NC2, NC3, NC4, COM)

* Power OFF = Relay OFF
* Power ON + Line OK = Relay OFF
* Power ON + Line FAULT = Relay ON
* 4 x N/O Relay Contacts (NO1, NO2, NO3, NO4, COM)

* Power OFF = Relay OFF
* Power ON + Line OK = Relay OFF
* Power ON + Line FAULT = Relay ON

* 1 x Common Relay Contact (NO, NC, COM)

* Power OFF = Relay OFF
* Power ON + Line OK = Relay OFF
* Power ON + Line FAULT = Relay ON

* 1 x Common Relay Contact (NO, NC, COM)

* Power OFF = Relay OFF
* Power ON + Line OK = Relay ON
* Power ON + Line FAULT = Relay OFF

Mounting     DIN-Rail Mountable Enclosure
Weight 300 g
Dimensions H112 x W55 x D74 mm

 

Dimensions

MR-4C Wirebreak Monitoring Relay - Dimensional Drawing

 

MR-4D Wirebreak Monitoring Relay - Dimensional Drawing

MR-4L Wirebreak Monitoring Relay - Dimensional Drawing

MR-4P Wirebreak Monitoring Relay - Dimensional Drawing

 

Ordering Information (Part Numbers)

  • MR-4C - 4-Channel Line Monitoring (Wirebreak) Module with 4 x N/C Relay Contacts (c/w 4 x 4k7 resistor)
  • MR-4D - 4-Channel Line Monitoring (Wirebreak) Module with 4 x N/O Relay Contacts (c/w 4 x 4k7 resistor)
  • MR-4L - 4-Channel Line Monitoring (Wirebreak) Module (c/w 4 x 4k7 resistor)
  • MR-4P - 4-Channel Line Monitoring (Wirebreak) Module (c/w 4 x 4k7 resistor)

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