Ampper Side-Post Battery Disconnect Switch 12V/24V Kit — Brass Knife-Blade, 200A Continuous

This compact kit provides a simple on/off solution to remove parasitic drain, secure batteries during storage or maintenance, and protect wiring on cars, boats, RVs, ATVs and other vehicles. The Ampper switch fits side post batteries with a 3/8" hole, uses a lift-style knife blade to interrupt power, and includes hardware to adapt to common side-post layouts. Built from solid brass for corrosion resistance, it handles heavy loads (200A continuous; 600A momentary at 12V) and installs in minutes with basic hand tools.

Will this switch fit my battery and electrical system?

Yes when your battery uses GM-style side posts with a 3/8" hole. It is designed for DC systems between 12V and 24V and works best mounted on the negative side as recommended for many installations.

• Compatible with side post batteries that accept a 3/8" bolt.
• Operates on 12V and 24V DC systems.
• Recommended installation on the negative terminal for grounding convenience.
• Not intended for top-post batteries without an adapter.

How much current can this disconnect switch handle and when does it trip?

The Ampper switch is rated for continuous loads up to 200 amps and can tolerate short surge currents up to 600 amps at 12V. It is a manual on/off knife blade — it does not auto-trip; you lift the blade to cut power instantly.

• 200A continuous rating for sustained loads.
• 600A momentary capacity at 12V for engine cranks and starter surges.
• Manual knife-blade action provides immediate positive disconnect.
• Solid brass construction dissipates heat and resists corrosion.

What comes in the Ampper kit and how easy is it to install?

The kit arrives with the switch plus multiple bolts and spacers so you can adapt to common side-post configurations. Installation is straightforward: disconnect the battery, attach the provided bolts and spacers, mount the switch, then test the on/off action.

• Included: 1x Ampper battery switch, 1 short bolt, two pairs of 3/8" side-post bolts (one short pair, one long pair), 2 spacers, 2 washers.
• Simple hand-tool installation — wrench and small socket recommended.
• Knife-blade lifts to isolate power quickly for storage or service.
• Can be installed standalone or locked together with another switch for tandem shutoffs.

Is the switch durable for marine and outdoor use?

Ampper built this disconnect with solid brass components to minimize rust and corrosion in harsh environments. The materials and compact packaging are suitable for boats, RVs, and vehicles where moisture and vibration are common.

• Solid brass construction resists corrosion in wet or salty conditions.
• Compact footprint — package size approximately 3.9" x 2.75" x 2.75".
• Mechanical knife-blade design reduces electrical arcing when opened under load.
• Ideal for seasonal storage or long-term layup to prevent battery drain.

Who this is for: The Ampper Side Post Battery Disconnect Switch is aimed at DIY vehicle owners, boaters, RV and ATV enthusiasts, fleet managers, and anyone who needs an easy, reliable way to isolate side-post batteries with a 3/8" terminal. It’s especially useful for people who store vehicles for extended periods, want to prevent parasitic battery drain, or require a simple mechanical cut-off for safety and maintenance.