After Market Relays

MTDV4-U200 relay - Voltage monitoring, timer delay-on /-off, 4 pole



Plug-in electronic voltage monitoring relay with optional delay-on and delay-off timer function and four change-over contacts. The delay time is adjustable with a lockable knob (either delay-on or delay-off, the other delay is fixed). The relay can also be supplied with fixed time delays (no knob). The pull-in voltage and drop-out voltage are both adjustable via internal screws. The relay can also be supplied with a fixed pull-in and drop-out voltage. Suitable for monitoring DC voltages.
The MTDV4-U200 offers a very small hysteresis (difference between pull-in and drop-out voltage). The relay is equipped with a LED which indicates the status of the relay contacts. Delay-off function for voltage drop up to 50% nominal voltage, no auxiliary supply necessary.
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 MTDV4- 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.


These relays are designed for demanding rolling stock applications. The MTDV4-U200 is used in applications for voltage monitoring with or without time delay(s).


  • DC voltage monitoring relay with time delay
  • Compact plug-in design
  • 4 C/O contacts
  • Pull-in and drop-out voltage adjustable via internal screws
  • Also available with fixed pull-in and drop-out voltage (no internal screws)
  • Very small hysteresis possible
  • Time delay on pull-in and/or drop-out
  • 1 delay time adjustable with a lockable knob, other delay time fixed
  • Also available with fixed time delays (no knob)
  • Time delay range: 0 ... 60 s
  • No auxiliary supply necessary
  • 1 LED for status indication


  • Flat, square and silver plated relay pins for excellent socket connection
  • Integrated snap lock
  • Optional positive mechanical keying relay to socket

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, EN 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