Automatic Power Control system


The Automatic Power Control system cuts the incoming power supply to a traction unit for short periods. This is required where power supplied from one part of a power distribution system in separated from another by a neutral section. Its fitment prevents damage to the power distribution system or the vehicle.
The onboard Automatic Power Control system consists of a control unit and a receiver. The system detects a track magnet positioned shortly before the beginning of the neutral section and sends a signal to the incoming power circuit breaker controller to open the circuit breaker. Once the system detects a second magnet positioned after the neutral section a second signal is sent to close the circuit breaker.
The control unit can be mounted inside the vehicle cab or integrated into an equipment rack. The receiver is a very robust unit and can be mounted on the vehicle main underbody or a bogie.


All railway applications with different sections in electrified railway lines. For example when different sections of power supply are isolated from each other via an insulated material into the contact wire, the APC system detects the marking of the neutral section and controls a circuit breaker to interrupt the circuit between the pantograph and the onboard electronic equipment. This prevents damage/wear and tear to the pantograph and overhead line or third rail.


  • Compact design
  • Robust system
  • Status LED’s on control unit
  • Receiver bogie mounted or at main underbody
  • Receiver available with conduit length to suit application
  • Receiver conduit fitted with quick release bayonet connector
  • Receiver compatible with Automatic
  • Warning System
  • Terminal box available to ease Receiver changeover


  • Long term availability
  • Easy to maintain
  • Low life cycle cost

Railway compliancy

  • EN 50155 Electronic equipment used on rolling stock for railway applications
  • IEC 61373 Rolling stock equipment – Shock and vibration test
  • EN 50121 Electromagnetic compatibility for railway applications
  • NF F16-101/102 Fire behaviour – Railway rolling stock
  • IEC 60529 European standard describes the protection class (IP-code)
  • RT/E/S/21088 Railtrack Line Specification
  • NR/GN/ELP/27010 Business Process Document – Guidance for compatibility between electric trains and electrification systems Issue 2 December 2005



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