After Market Relays

DI-U900 relay - Current monitoring



Plug-in current monitoring railway relay with two change-over contacts. Suitable for AC or DC currents.
Proven reliable operation in switching high DC voltage / inductive loads and low currents. Standard equipped with magnetic arc blow-out for high breaking capacity and long contact life. No external retaining clip needed as integrated ‘snap-lock’ will hold relay into socket under all circumstances and mounting directions.
The construction of the relay and choice of materials makes the DI-U900 relay suitable to withstand low and high temperatures, shock & vibrating and dry to very humid environments.
Compact design, choice of many options and a wide range of sockets makes the DI-U900 relay an easy and flexible solution to use.


These relay series are designed for demanding rolling stock applications. The DI-U900 is used in applications for current monitoring or where switching is activated by a fixed current level.


  • Current detection relay
  • Compact plug-in design
  • AC or DC coil
  • 2 C/O contacts
  • Magnetic arc blow-out
  • Flat, square silver plated relay pins for excellent socket connection
  • Wide range sockets
  • Integrated snap lock
  • Transparent cover
  • High DC breaking capacity
  • 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
  • EN 50121 Electromagnetic compatibility for railway applications
  • NF F 16-101/102, TS 45545-2 Fire behaviour - Railway rolling stock
  • IEC 60529 European standard describes the protection class (IP-code)
  • NF F 62-002 On-off contact relays and fixed connections



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Railway rolling stock
Railway signalling