Русский
English
Spanish
Portuguese
Turkish
German
French
ANL Fuse
ANL fuse, MIDI fuse, MAXI fuse, high current fuse, battery fuse, main cable fuse, 200A fuse, 300A fuse, bolt-down fuse, mega fuse
An ANL fuse is a high-current bolt-down fuse protecting the main positive cable between the battery and the distribution system. ANL fuses are rated 80–750 A and are the standard protection for cables of 35 mm² and above in camper van and motorhome electrical systems.
The ANL (or equivalent MIDI/MAXI) fuse must be installed within 300 mm of the battery positive terminal, before any other connection. The fuse rating is chosen to match the cable's current-carrying capacity, not the load. A 50 mm² cable typically requires a 200–300 A fuse; 35 mm² a 150–200 A fuse. MIDI fuses cover 58–200 A for smaller cables.
FAQ
Where exactly must the main fuse be fitted?
Within 300 mm (12 inches) of the positive battery terminal, before any switch, relay or connection. This protects the entire cable run from the battery. Without a fuse at the battery, a short circuit anywhere in the cable run can cause a fire.
How do I choose the correct fuse rating?
Match the fuse to the cable's capacity, not to the load. Find the current-carrying capacity of your cable (e.g. 35 mm² copper ≈ 170–200 A in free air) and choose a fuse rated just below that. If the fuse keeps blowing, fit a larger cable — not a higher-rated fuse.