- 2 slots – Double pole on/off switch to isolate the incoming mains supply entering from below.
- 4 slots – Programmable Logic Controller (PLC) which takes 2 inputs (remote on/off via radio link and contactor status – see item #4) and generates 1 of 4 outputs (corresponding to off, 6 Amps, 10 Amps or 16 Amps). Beneath the PLC (and not visible inside the case) sits a circuit board with an array of resistors corresponding to the required current settings.
- 2 slots – Protocol controller which handles the Mode 3 handshake with the car and switches between current settings based on the selected resistor.
- 1 slot – Contactor which turns the power to the vehicle on/off based on the output from the protocol controller. Cable to car exits below.
- 1 slot – unused.
The dedicated charger circuit is fed from a RCBO in a small consumer unit on the other side of the garage which combines overcurrent protection (20 Amps) and Type A residual current detection (30 mA).