Obsolete Industrial Relays

FDA series, interval timer relay (flashing relay)

This relay is obsolete from January 1, 2023


Plug-in electronic pulsing relay with two change-over contacts, suitable for DC and AC coil voltage (50/60 Hz). When the relay is activated the coil starts with an interval. The pulse time and interval time are equal. The pulsing frequency is adjustable with a lockable knob. The relay can also be supplied with a fixed pulsing frequency (no knob). The relay is standard equipped with double zener diode coil protection.

The construction of the relay and choice of materials makes the FDA 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 FDA relay an easy and flexible solution to use.


These relay series are designed for demanding industrial
applications where a pulse frequency in output is necessary
after activating the relay.


  • Flashing relay (symmetrical)
  • Duty cycle: 1/2
  • DC and AC (50/60 Hz) input
  • Standard coil is 50 Hz (60 Hz on request)
  • Compact plug-in design
  • 2 C/O contacts
  • Pulse time adjustable with a lockable knob
  • Pulse times between 0.5 s - 3 s
  • Also available with fixed pulse time (no knob)
  • Double zener diode coil protection
  • Flat, square and silver plated relay pins for excellent socket connection
  • Integrated snap lock
  • Optional positive mechanical keying relay to socket

Product information request

Railway rolling stock
Railway signalling