What fuse does an RV use?
RV 12 V systems use MAXI blade fuses at the main DC distribution panel for high-current feeds and ATC blade fuses on individual branch circuits for lights, pumps, slides, and accessories.
The 12V DC distribution panel
Every RV has a 12 V DC distribution panel — typically a fuse block mounted in a cabinet, under the dinette, or in the front storage bay. This panel receives power from the house batteries and distributes it through individual fuse positions.
The main feed from the battery to the panel is usually protected by a large MAXI blade (40–100 A) or an ANL bolt-down fuse mounted close to the battery.
Branch circuit fuses
Individual circuits in the panel use ATC blade fuses, typically:
- 5–10 A — interior LED lighting, USB outlets
- 15 A — water pump, bedroom outlets, slide motor controls
- 20–30 A — converter/charger output, refrigerator 12V, awning motors
Some newer RVs and older units with Japanese-sourced panels use mini blade (ATM) fuses instead of standard ATC. Check the physical size — ATM is about 1 cm shorter than ATC.
Shore power and converter fuses
The 120 V AC side of an RV is protected by the circuit breaker panel, not blade fuses. The converter (which charges the house battery from shore power) typically has its own built-in fuse — check the converter's documentation for the correct replacement type if the converter stops charging.
Finding your fuse panel
- Check the RV's owner manual — it will show the fuse panel location and a circuit-by-circuit diagram.
- Look for a panel with a hinged door in the living area, usually labeled with circuit names.
- Each fuse position should be labeled; pull the fuse for the non-working circuit and inspect it.