310 relay – Latching, safety critical, 18 contacts


The 310 is a latching relay with 2 stable magnetically latched states. When 1 coil is energized, the relay actuates from magnetically latched position 1 to 2. When the other coil is energized, the relay actuates back from magnetically latched position 2 to 1. Relays have 18 double break contacts (Form X & Y – per customer specification) in all N/O and N/C combinations.
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 conform to standards in force 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. Weld no transfer safety contacts are standard. If one N/O contact welds, no N/C contact can close and visa versa. All relays are factory tested to insure they meet this important safety requirement.


The 310 latching relay allows the memory of the state of the circuit in case of power interuption. Optional gold contact are possible for dry circuit applications or silver and gold contacts combined for mixed load applications.


  • Latching relay using 2 separate coils and magnetic rocker mechanism
  • Plug-in design with secure locking feature for maximum ease of maintenance
  • 18 double break contacts in all N/O and N/C combinations
  • Weld no transfer safety contacts standard
  • Optional gold contacts
  • Optional gold and silver contacts
  • Contact life (mechanical) of 100 million cycles
  • -40 °C…+80 °C operating temperature


  • Proven reliable
  • Long life cycle
  • Easy to maintain and replace
  • Low life cycle cost
  • No maintenance

Railway compliancy

  • NF F 62-002 Rolling stock – Instantaneous relays contacts and sockets
  • NF F16-101/102 Fire behaviour – Railway rolling stock
  • Relay has been approved to go on the  English/French train channel shuttle




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