FDA4-U200 relay – Flashing, 4 pole


Plug-in electronic railway pulsing relay with four change-over contacts. When the relay is activated the coil starts with an interval. The pulse time and interval time are equal. The relay is supplied with a fixed pulsing frequency. The relay can also be supplied with an adjustable pulsing frequency (relay with knob).
The relay is equipped with two LEDs which indicate the presence of power supply and the energizing of the coil. 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 FDA4-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 FDA4-U200 relay an easy and flexible solution to use.


These relay series are designed for demanding train borne applications. The FDA4-U200 is used in applications where a pulse frequency in output is necessary after activating the relay.


  • Flashing relay (symmetrical)
  • Duty cycle: 1/2
  • Compact plug-in design
  • 4 C/O contacts
  • Fixed pulse rate
  • Pulse times between 0.2 s…60 min
  • Also available with adjustable pulse rate (with 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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