There is a negative common bus to the switches which when connected, enables the actuator to glow red when 'on'. Specifications: DC Voltage : 12V Nominal Voltage : 12V Type : Incandescent Illumination Colour : Red Illumination Position : Top Width : 100mm Height : 160mm Depth : 45mm Packaged Volume : 1.16l Packaged Weight : 0.23kg Packaged Length : 17.3cm Packaged Width : 12cm Packaged Height : 5.6cm Switch Type : Rocker Pole Throw Type : SPST Poles / Contacts : 1 pole Throws / Positions : 1pos Switch Connection : Spade Terminals Mechanism Material : ABS Plastic (Acrylonitrile Butadiene Styrene) Number of Switches : 6pc Individual Circuit Breakers : 10A This panel meausres 100 x 160 overall and can be mounted either vertically or horizontally. The circuit breakers are connected in common + by a soldered strip which accepts a 1/4 QC connector. They are then soldered to a 10A rated illuminated rocker switch. The rocker switches have 4.8 QC tabs and are single pole type. The circuit breakers are rated thus: 10A, 8A, 6A and 4A which is quite handy really.