There is a negative common bus to the switches which when connected, enables the actuator to glow red when 'on'. Specifications: DC current rating : 35A DC Voltage : 12V Nominal Voltage : 12V Type : Incandescent Illumination Colour : Red Illumination Position : Top Width : 100mm Height : 110mm Depth : 45mm Mounting Method : Panel Attachment / Securing Method : Screw Down Square Mount Hole Width : 76mm Square Mount Hole Height : 97mm Packaged Volume : 0.22l Packaged Weight : 0.17kg Packaged Length : 3.8cm Packaged Width : 11.6cm Packaged Height : 5.1cm Switch Type : Rocker Pole Throw Type : SPST Poles / Contacts : 1 pole Throws / Positions : 1pos Switch Function : Locking On/Off Switch Connection : Spade Terminals Mechanism Material : ABS Plastic (Acrylonitrile Butadiene Styrene) Number of Switches This panel meausres 100 x 110 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.