An auxiliary switch panel is a bank of dedicated electrical switches used to control added vehicle accessories through properly fused and relayed circuits.
What can auxiliary switches control?
Common uses include driving lights, light bars, air compressors, refrigerators, radios, pumps and recovery equipment. A winch may use its own high-current contactor while a dashboard switch controls the contactor rather than carrying full motor current.
Factory vs aftermarket panels
A factory system can provide prewired circuits, labelled switches and known fuse/relay capacity. Aftermarket switch panels can add similar functionality but the installer must size wiring, protection and relays correctly for each load.
INEOS Grenadier example
The Trialmaster specification includes a high-load auxiliary switch panel and electrical preparation, plus a 400W power take-off. The overhead layout is one of the Grenadier interior's most recognizable features.
Why circuit rating matters
The switch label is not the electrical limit. Accessories must stay within the current rating of the circuit, fuse, relay and wiring. High-current accessories should follow the vehicle and accessory maker's installation instructions.