The AllSpark 40A Surface Mount Circuit Breaker (AS-CB40SM) delivers reliable, resettable overcurrent protection for 12V and 24V DC electrical systems in caravans, camper trailers, motorhomes, and 4WD builds. Rated at 40 amps, it is engineered to protect high-draw circuits — such as compressor fridges, electric winches, auxiliary lighting, and solar charge controllers — from damaging overcurrent events. The surface mount housing allows direct bolt-to-panel or bracket installation, eliminating the need for a dedicated fuse holder and making wiring neat and accessible. Once tripped, the breaker resets manually with a simple button press, so you are never left hunting for a spare fuse in the middle of the Australian outback.

Designed for the demands of off-road travel and remote-area camping across Australia, the AS-CB40SM suits installations in caravan battery compartments, 4WD dual-battery trays, RV control panels, camper trailer electrical boxes, and motorhome service bays. Its compact, vibration-tolerant construction handles corrugated dirt roads and rough bush tracks without nuisance tripping, making it a trusted choice for serious grey nomads, overlanders, and weekend warriors who rely on a dependable 12V system. Whether you are protecting a portable fridge running off your second battery, securing a hardwired DC–DC charger circuit, or safeguarding an onboard 240V inverter feed, this circuit breaker is a straightforward, long-service upgrade over standard blade fuses.

Key Features

• 40A rating protects high-draw 12V/24V DC circuits including fridges, winches, and lighting
• Resettable design — push-button manual reset eliminates the need for replacement fuses
• Surface mount housing for direct panel or bracket installation — no separate fuse holder required
• Vibration-tolerant construction suits corrugated outback roads and off-road 4WD use
• Compact form factor fits caravan battery bays, 4WD dual-battery trays, and RV control panels