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CK relay - safety critical, 9 contacts

The CK safety critical, weld resistant and safety critical relay has 9 double break contacts (Form X & Y - per customers specification) in all NO and NC combinations. Weld no transfer and silver tin oxide safety contacts are standard. The plug-in design offers secure locking feature for maximum ease of maintenance (no wires need to be disconnected or other hardware removed for relay inspection or replacement).
The resistance to impact and vibration is conforming the standards for Railway Transported Equipment. Positive mechanical keying of relay to socket is built into relay and socket during manufacture and terminal identifications are clearly marked on identification plate that is permanently attached to the relay. In power interruption situation relay armature will assume a “safe” position whatever is the relay operating position due to the strength of the 1 compressed spring which pushes the armature back in the rest position.
The CK relays is pluggable in the COR NJ socket.


The CK relay is designed to offer ultra-compact space saving size for safety critical applications where a high degree of resistance to welding is required. Stationary contacts are silver tin oxide. Mobile contacts are hard silver laminated to copper.


  • Instantaneous relay
  • Safety critical relay
  • Weld resistant
  • Weld no transfer safety contacts standard
  • Plug-in design with secure locking feature
  • 9 double break contacts in all NO and NC combinations
  • Contact life (mechanical) of 100 million cycles
  • -40°C to +80°C operating temperature


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

Railway compliancy

  • NF F 62 - 002 Rolling stock - Instantaneous relays contacts and sockets
  • NF F70-031 sec. 7.1.2 and 7.1.3 (for weld resistant contacts)
  • NF F16-101/102 Fire behaviour - Railway rolling stock

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Railway rolling stock
Railway signalling