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PCM2 34 and 48 Channel Power Control Modules - the smart solution to race car wiring by OBR

The intelligent control and distribution of battery power in a modern racing car. The PCM2 and PCM2 Lite are innovative, intelligent and programmable solid state modules which replaces relays and circuit breakers, simplifies wiring harnesses and provides diagnostic capabilities.

PCM AC8 Power Control Module  8 channels PCM AC8 Power Control Module  8 channels
PCM AC8 Power Control Module  8 channels thumb PCM AC8 Power Control Module  8 channels thumb

PCM AC8 Power Control Module 8 channels

8 high side outputs
16 analog and digital inputs
2 x CAN lines with 128 I/O
Software selection of CAN termination
User defined transfer functions and scaling
Warning light and reset switch
Military grade Motorsport connectors
6061-t6 aircraft grade aluminum


  • 8 x analogue sensor inputs 0-5v
  • 8 x digital inputs, switching between low, open and high
  • 1 x VREF 5V for sensors
  • 1 x reset button for resetting channels with tripped "fuse"


  • 8 x high power outputs (20A continuous, 75Amp peak)
  • 1 x warning light for diagnostic
  • 64 x CAN ports outputs (user defined)
  • 1 x 5.0volt Vref for sensors

In-rush current capability 150A

Maximum recommended continuous output current 100A


In the past, a production car uses relays and fuses or circuit breakers to protect the electrical system from short circuit damage and even fire in case of a fault in the wiring.

Such a system is not suitable for use in a competition car.  Relays and fuses are exposed to a harsh environment of heat and vibration which can cause unintended electrical shut downs.  Furthermore, the wiring for fuses and relays are often very complex and this makes fault tracing complicated, in particular if errors happen during competition.

In the modern world of electronics we have for many years done away with these vulnerable components and have replaced them with computer controlled modules.  Instead we have a microprocessor that monitors switch requests, current draws and load conditions.  OBR systems do not just shut down if there is a fault, they evaluate and analyze the cause of the failure and then reset failed channels automatically and test the outputs.

OBR's award winning PCM2, the new PCM LITE and the compact PCM AC power control modules (sometimes referred to as PDU or PDM) take the whole Power Control Module concept much further than conventional modules.  Based on our experience and success with developing power boxes, OBR PCM's are very powerful, flexible and technically advanced modules.  OBR PCM2, PCM LITE and PCM AC are huge steps ahead of our competitors, in technology, features and their very high current handling ability.

Our PCM modules provide an effective and inspired alternative to conventional relays, circuit breakers, fuses and wires that can so often be a tangle of complexity and untidiness around a typical racing car’s power junction box.

Furthermore, they monitor status, temperature and current draw for each individual output, an effective tool in detecting and preventing faults.

OBR PCM's have all been designed to handle very high inrush currents as well as high continuous current handling.  The inrush current is drawn in the instant when, for example, a fan is switched on or the paddle shift air compressor starts.  Our PCM's are capable of handling this kind of current draw of up to 300A over a short period of time.

With PCM2, PCM LITE and PCM AC OBR provide the user with modules which can handle virtually limitless event based configuration options.  By having the control logic arranged around user defined events it is the intention to offer an almost unrestricted control strategy to the end user.

OBR supply PCM LITE with a pre-configured setup ensuring a simple and straight forward installation – but still offering the user full access to write the control logic.

When evaluating power control modules it is very important to judge the weight of a module correctly.  To handle high currents and to dissipate the heat associated with these high currents, the module should feature the highest content of copper feasible within the design rules.

When it comes to selecting a PCM powerbox, remember the lightest unit is very likely not the most reliable!