Voltage 2, 4, 6, 9, 12 or 14V a.c. or unsmoothed d.c. at 4A continuously, or up to 5A for periods of 1 hour. Voltage ranges are selected and locked by means of a removable key. In any incidence of overload, including direct short, a current sensing circuit breaker mounted on the front panel will operate and disconnect the output voltage. Outputs are taken from colour coded 4mm sockets mounted on the front panel. An illuminated on/off switch is mounted on the rear panel adjacent to a fused appliance inlet. Housed in a robust metal case with a durable powder coated finish. Supplied with key and instruction.