After Market Relays

TDD4B2-U200 relay - 2 pole delay-on and 4 pole instantaneous



Plug-in electronic railway timer relay with four instantaneous change-over contacts and two time delayed change over contacts. When the relay is activated there is a delay on pull-in for the time delayed contacts. The timer relay has a fixed customer specified delay time, but can also be supplied with an adjustable delay time (with lockable knob). The delayed contacts are weld no transfer contacts. The relay is equipped with two LEDs which indicate the presence of power supply and the energizing of the time delayed contacts.
The construction of the relay and choice of materials makes the TDD4B2-U200 relay suitable to withstand low and high temperatures, shock & vibrating and dry to humid environments.
No external retaining clip needed as integrated ‘snap-lock’ will hold relay into socket under all circumstances and mounting directions.
Compact design, choice of many options and a wide range of sockets makes the TDD4B2-U200 relay an easy and flexible solution to use.



These relay series are designed for demanding rolling stock applications. The TDD4B2-U200 is used in applications where both instantaneous contacts and time delayed contacts are necessary.


  • Time delay and instantaneous relay
  • 2 C/O contacts with delay on pull-in and 4 C/O instantaneous contacts
  • Fixed time delay (no knob)
  • Also available with adjustable time delay with lockable knob
  • Total time delay range: 0.1 s...60 min
  • Flat, square and silver plated relay pins for excellent socket connection
  • Wide range sockets
  • Integrated snap lock
  • Transparent cover
  • Optional positive mechanical keying relay to socket
  • Flexibility by many options


  • Proven reliable
  • Long term availability
  • Easy to maintain
  • Low life cycle cost
  • No maintenance

Railway compliancy

  • EN 50155 Electronic equipment used on rolling stock for railway applications IEC 60571 Electronic equipment used on railway vehicles
  • IEC 60077 Electrical equipment for rolling stock in railway applications
  • IEC 60947 Low voltage switch gear and control gear
  • IEC 61373 Rolling stock equipment - Shock and vibration test
  • IEC 60947-5-4 Electromechanical components for control applications. This standard examines both coil and contact specifications in depth
  • EN 50121 Electromagnetic compatibility for railway applications
  • NF F 16-101/102, TS 45545-2 Fire behaviour - Railway rolling stock
  • NF F 62-002 On-off contact relays and fixed connections

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Railway rolling stock
Railway signalling