CM relay – 7 contacts and 2 gold contacts


The CM relay is designed for combined power & dry circuit applications in diesel locomotives.
Part number CM 045 72 37 S M is rated for 72 VDC nominal voltage and is configured with 4 N/C and 5 N/O double break contacts. Two of them (1 N/C & 1 N/O) are gold bifurcated contacts (dry circuit). All other contacts are in silver.
On specific request, to provide for the large voltage drop that occurs during start-up of a diesel engine, the non-dropout voltage can be adjusted to a low value of 24 VDC for a 72 VDC nominal coil voltage.
The CM relays is pluggable in the COR NJ socket.


The CM relay is designed for both power levels and low level signals are being switched for general purpose heavy duty applications such as lighting, pumps and fans, as standard Weld no transfer design for safety critical applications such as door control, emergency brake failure, interlocking traction and breaking with a gold bifurcated contact for dry circuit signal information.


  • Instantaneous relay
  • For combined power & dry circuit applications in diesel locomotives
  • 4 N/C + 5 N/O double break contacts with 1 N/C & 1 N/O gold bifurcated contact and all other contact in silver
  • Weld no transfer safety contacts standard on silver contacts
  • Contact life (mechanical) of 100 million cycles
  • -40 °C…+80 °C operating temperature


  • Proven reliable in heavy duty application
  • Space Saving package size
  • Long life cycle cost
  • Easy to maintain and replace
  • Used in safety critical application
  • Low life cycle cost

Railway compliancy

  • NFF 62-002 Rolling stock – Instantaneous relays contacts and sockets
  • NF F16-101/102 Fire behaviour – Railway rolling stock Features Railway compliancy



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