After Market Relays

WDE4-U300 relay - Timer, one-shot, AC input, 4 pole



Plug-in electronic railway one-shot timer relay with four change-over contacts, suitable for AC input voltages with a frequency of 50/60 Hz. When the relay is activated the coil is energized with one pulse. The pulse time is adjustable with a lockable knob. The relay can also be suplied with a fixed pulse time (no knob). The relay is equipped with two LEDs which indicate the presence of power supply and the energizing of the contacts. Also standard equipped with magnetic arc blow-out for high breaking capacity and long contact life.
The construction of the relay and choice of materials makes the WDE4-U300 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 WDE4-U300 relay an easy and flexible solution to use.



These relay series are designed for demanding rolling stock applications. The WDE4-U300 is used in applications where one pulse in output is necessary after activating the relay.


  • One-shot timer relay
  • AC input
  • Compact plug-in design
  • 4 C/O contacts
  • Adjustable pulse time
  • Pulse times between 0.1 s...60 min
  • Also available with fixed pulse time (no knob)
  • Magnetic arc blow-out
  • Two LEDs for status indication
  • Flat, square and silver plated relay pins for excellent socket connection
  • Integrated snap lock
  • Optional positive mechanical keying relay to socket


  • 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