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Power control modules

The intelligent control and distribution of battery power in a modern racing car. The PCM is an innovative, intelligent and programmable solid state module that replaces relays and circuit breakers, simplifies wiring harnesses and provides diagnostic capabilities.

PCM2 thumb PCM2 thumb


OBR PCM2 (48 Channel version)

48 Outputs

30 Inputs

500 Logic and user events

4 CAN BUS ports

Real time clock

Build in data acquisition

Military grade Motorsport connectors

6061-t6 aircraft grade aluminum

System overview

4 x CAN BUS universes and 78 I/O channels in conjunction with 500 user defined routing, scaling, and Logic events, makes PCM2 a very powerful power management system

PCM2 benefits from a multitasking operating
system for processing heavy instructions.

PCM2 is equipped with a real time clock that is recorded in parallel with the built-in data recording facility.

Automatic or manual "fuse" reset with auto retry

All PCM2 is license free and comes with free software.

Inputs (30 physical + 512 CAN)

  • 16 x analogue 0-5V inputs
  • 14 x digital  (inputs triggering on: low / open / high
  • 4 x CANBUS ports each with 128 CAN channels (Software selected CAN termination)
  • 1 x reset switch

Board temperatures are monitored and can be exported via CAN.

Outputs (48 individual)

  • 26 x power outputs (8A continuous)
  • 12 x high power outputs (20A continuous)
  • 2 x very high power outputs (20A continuous, 200A peak)

  • 2 x wiper outputs (8A continuous)

  • 2 x high power PWM outputs 20A continuous (low+high side - Full H-bridge)
  • 2 x high power PWM outputs 8A continuous (low+high side - Full H-bridge)

  • 4 x trigger channels (30mA Tri-State. user defined level)
    • 0.0 volt
    • 2.5 volt
    • 5.0 volt

Multiple outputs can be grouped for extreme high current applications

Please note that the maximum recommended current draw per channel is limited by the
connector contacts - not by PCM2’s driver stages. We have rated the individual channel’s
current draw in relation to the connector manufacturer’s specifications.


PCM2 is a compact and light weight module, measuring 191 x 176 x 36 mm (excluding the
Autosport connectors).


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!

OBR membrane switch panels (MSP) are designed to simplify the installation and reduce the wiring complexity of a traditional switch panel in a race car.

These intelligent programmable panels offer improved driver visibility, simplified cockpit layout, and complete post installation flexibility. 

Panels offer 8 to 20 switches with momentary or latching conditions, as well as up to 3 analogue inputs all exported over a simple single Deutsch ASL Autosport connection. 
Each switch panel is backlit via an inbuilt electroluminescent layer, this can be automatically dimmed in the software or adjusted over CAN bus. To ensure even greater visibility during long distance races, the panels can also feature UV-florescent inks for button surrounds and labels. 

40 red/green LED switch status lights with local or closed loop feedback control provide excellent diagnostics and a clear indication of switch status.
OBR switch panels can be supplied in many layouts from file or designed to suit customer’s individual needs; customized colour graphics, labels, switch mounting holes and logos are encouraged.