TBSBAO 400 relay – Delay-on pull-in, 4 C/O


The TBSBAO 400 is a delay-on pull-in relay with 4 double make / double break C/O contacts (form Z). The delay is fully programmable with a dip switch) from 50 ms to1.023 s. The access to dip switch is available by removing time delay cover. This feature prohibits frivolous field time delay setting.
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 TBSBAO 400 relay is pluggable in the following sockets: EA 102 B, EA 102 BF, EA 103 BF, EA 104 B, EA 104 BF, EA 105 BF, EA 112 BF.


The TBSBAO 400 timing relay is designed for heavy duty applications with a programmable timing function used for example in HVAC and lighting.


  • Delay-on plug-in
  • Delay range 50 ms…1.023 s
  • Time delay fully programmable by dip switch
  • Status LED indicator
  • Plug-in design with secure locking feature for maximum ease of maintenance
  • 4 double make / double break C/O contacts (form Z), 12 A
  • In standard with weld no transfer contacts
  • -40 °C…+85 °C operating temperature.


  • Proven reliable in heavy duty application
  • Weld no transfer
  • Long life cycle
  • Accurate timing selection finger safe
  • 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 F 16-101/102 Fire behaviour – Railway rolling stock
  • EN 50155 Railway application – Electronic equipment used on rolling stock
  • IEC 61373 Railway application – shock and vibration tests




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