SBG relay - Latching, 4/3 gold contacts



The SBG is a latching safety critical 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.
Two types of configuration are available:
- 400 type contact relays have 4 changeover double break contacts (Form Z)
- 300 type contact relays have 3 changeover double break contacts (Form Z) a 4th double break contact is reserved for automatic coupling of the coils. Contacts are gold plated on silver.
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. 


The SBG latching relay allows the memory of the state of the circuit in case of power interruption.


  • Latching relay using 2 separate coils and magnetic rocker mechanism
  • Two types available with 4 C/O (type 400) or 3 C/O (type 300) contacts, gold
    plated on silver
  • All contacts are double make - double
    break contacts (form Z), 8 A
  • Plug-in design with secure locking feature for maximum ease of
  • Optional Weld no transfer 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

  • N FF 62-002 Rolling stock - Instantaneous relays contacts and sockets
  • NF F 16-101/102 Fire behaviour - Railway rolling stock



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Railway rolling stock
Railway signalling