Fastronix Solutions 3/8" 2-Post SPST Battery Disconnect Switch - 180A Continuous, 1000A Peak

Fastronix 3/8" 2-Post (SPST) Battery Disconnect Switch provides a single, high-current manual shutoff rated for 180A continuous and 1000A intermittent to isolate a vehicle or equipment battery quickly and safely.

The Fastronix 3/8" 2 Post SPST battery disconnect is a compact, heavy-duty master cut-off designed for automotive, marine, RV, and motorsports applications where a reliable single-point battery isolation is required. Built to accept 3/8" stud connections and engineered for high inrush loads, this switch lets you interrupt the entire electrical system with one manual action. It meets common competition and safety needs when a battery is relocated and works well as a long-term storage or service disconnect for vehicles and mobile equipment.

How does this switch handle high current loads?

The switch is specified for 180 amps continuous duty and can tolerate intermittent peaks up to 1000 amps, making it suitable for systems with heavy starter or accessory draw. Its SPST (single pole, single throw) design isolates the entire battery feed when opened, removing power from all downstream circuits.

• 180A continuous rating for sustained electrical systems.
• 1000A intermittent capability for starter and surge events.
• 3/8" studs for secure, low-resistance connections.
• SPST configuration isolates the main battery feed.

Where and how can I mount the switch?

Install the switch through a 3/4" mounting hole for a tidy panel fit; if surface mounting is needed, pair with the Fastronix 980-000 switch mount to attach using two 1/4" fasteners. The compact body and common stud spacing make it straightforward to integrate into dashboards, battery boxes, or custom enclosures.

• Fits directly in a 3/4" panel hole for flush mounting.
• Use Fastronix 980-000 mount for surface or bulkhead installations.
• Two 1/4" holes on the mount permit solid mechanical support.
• Low-profile design conserves panel space in cramped installations.

What electrical safety and protection options are available?

The disconnect includes threaded studs for secure terminations and can be combined with Fastronix 404-110 terminal covers to shield the exposed studs from accidental shorting. Using protective covers and correct torque on fasteners reduces corrosion and accidental contact risks, improving long-term reliability.

• Pair with Fastronix 404-110 terminal covers for stud protection.
• Threaded 3/8" studs provide strong mechanical and electrical contact.
• Simple manual operation offers a visible, positive open/closed state.
• Recommended to use proper ring terminals and corrosion protection.

Is this switch compliant for motorsports and recreational use?

The Fastronix 2-post battery disconnect is commonly used where a single master cutoff is required—NHRA rules often demand an easily accessible disconnect when the battery is relocated. It is also a practical choice for RVs and stored vehicles to prevent battery drain and simplify maintenance.

• Meets common NHRA requirements for relocated batteries when used as specified.
• Convenient for RVs and trailers as a storage power cut-off.
• Manual operation provides quick service and emergency isolation.
• Durable design suited to automotive and recreational environments.

Who is this for: Technicians, hobbyists, and vehicle owners who need a robust, easy-to-install master battery disconnect—especially those working on race cars, custom battery relocations, RVs, boats, or industrial equipment. If you require a straightforward SPST switch that handles heavy starting currents, mounts cleanly in a panel or with an optional mounting plate, and can be protected with terminal covers, the Fastronix 3/8" 2 Post SPST switch is a practical, high-current solution.