Home Products Electronic Modules Monitoring Modules MR-4x: Line Monitoring (Wirebreak) Relay
Module
MR-4x: Line Monitoring (Wirebreak) Relay Module
Overview
The MR-4C / MR-4D / MR-4L 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).
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 is commonly used to monitor signal loop continuity for applications
such as:
Emergency Stop Push-buttons
Smoke Detectors
and more...
Connection Diagram
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Specifications
Model MR-4C / MR-4D / MR-4L
Supply Voltage 24 VDC
Power
Consumption110mA (max)
Ambient Operating
Temperature-10 to +50 degC
Monitoring
Channels
Inputs for 4 Circuits (each with 4k7
End-of-Line resistor)
Individual fault LED allows for easy
location of faults
Output Contacts
MR-4C: 4 x N/C Relay Contacts (NC1,
NC2, NC3, NC4, COM)
MR-4D: 4 x N/O Relay Contacts (NO1,
NO2, NO3, NO4, COM)
MR-4L: 1 x Common Relay Contact
(NO, NC, COM)
Contact Rating: 3 Amps at 240 VAC
(resistive)
Mounting DIN Rail Mountable
Weight 300 g
Dimensions(mm) 112(H) x 55(H) x 74(D)
Dimensions
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Last Updated on Friday, 15 October 2010 17:46
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)
Copyright © 2011 Pan Delta Controls. All Rights Reserved.
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