WirthCo Fuse Holders - In Line

WirthCo In-Line Fuse Holders for 12V Circuit Protection

Every accessory you add to a vehicle, boat, or RV, such as an amplifier, light bar, or winch controller, needs its own protection against short circuits. An in-line fuse holder is the simplest way to do that, and WirthCo's range under its Battery Doctor label is built around practical, easy-to-install designs. The company is a Minneapolis-based manufacturer that was established in 1980 and has focused on battery and electrical accessories ever since. Its in-line fuse holders are a natural extension of that expertise.

Fuse Styles in the WirthCo Lineup

The small but focused selection covers the most common fuse formats found in automotive and marine wiring:

• ATO/ATC standard blade (30A): The Battery Doctor in-line ATO/ATC holder is a 30 ampere design for blade fuses. It uses 12-gauge wire with a 5-1/2 inch loop length, and includes a water-resistant cap.
• Stackable ATO/ATC: A related stackable version of the 30 amp blade holder is also offered, with a water resistant cover and 5-1/2 inch loop length.
• ATM/mini blade (20A): For tighter spaces, the in-line ATM/mini-fuse holder features a water-resistant cap and two 6-inch wire leads with 16 gauge wire.
• MinBlade LED holder (30A): This version has a built-in LED that makes a blown fuse easy to identify, and pairs a 12 gauge wire with a water-resistant cover.
• Medium-duty AGC (20A): Designed for glass-style fuses, this holder is a 20 amp in-line unit for AGC and SFE fuses with 14-gauge wire, a durable locking cap, and an 8-inch wire loop.

What Sets These Holders Apart

Two features stand out. The first is the water-resistant cap found on the blade-style holders. Fuse holders are often mounted in engine bays, under dashboards, or near bilge areas, and keeping moisture away from the fuse contacts helps prevent corrosion and intermittent connections. The second is the built-in LED on the MinBlade model, which saves time when you are troubleshooting a dead accessory, since you can see at a glance whether the fuse has blown.

The holders also come pre-wired with leads sized for typical accessory loads. Matching wire gauge to the fuse rating matters, as undersized wire can overheat before the fuse ever opens, so the 12-gauge leads on the 30 amp models are a sensible fit. Many of these products are also RoHS compliant.

Choosing the Right Holder

• Match the fuse type: ATO/ATC, ATM mini, and AGC fuses are not interchangeable, so confirm the style already used in your circuit.
• Respect the amperage rating: Never install a fuse that exceeds the holder's maximum rating or the wire's capacity.
• Consider the environment: Choose water-resistant caps for marine, off-road, and exterior installations.
• Check whether a fuse is included: Some models ship with a fuse, while others do not.

Explore More

These holders sit alongside WirthCo's broader range of battery disconnect switches, isolators, and chargers. Visit the WirthCo brand page to see the full lineup, or browse the complete Fuse Holders - In Line category to compare options from other manufacturers.