MOTOFLEX ON/Off Battery Disconnect Switch 12V–48V, 300A Continuous with Removable Red Knob

The MOTOFLEX ON/Off Battery Disconnect Switch is a compact, manual master cut-off for 12V–48V systems that stops parasitic drain and adds a theft-deterrent by physically disconnecting the battery.

This heavy-duty mechanical switch is built for vehicles, boats, RVs and other equipment where reliable power isolation matters. With a slim profile designed for tight engine-bay installs, marine-grade terminals, and a removable red knob to prevent unauthorized use, it’s a straightforward way to cut all battery power without fuses or electronics that can fail. The switch supports continuous currents up to 300A and peak crank demands to keep higher-draw starters and accessories protected while remaining resistant to corrosion and splash exposure.

How does this switch prevent battery drain when a vehicle sits idle?

By creating a physical open circuit between the battery and the vehicle’s electrical system, the MOTOFLEX disconnect removes all parasitic loads. That means electronics and accessories cannot draw current once the knob is turned to OFF, preserving battery charge for long storage periods.

• Shuts off the entire battery supply to accessories and systems
• Mechanical operation with no standby power draw
• Recommended installation on the negative side to minimize corrosion risk

Will this handle my boat, RV, or car starter demands?

Yes — the switch is rated for 300A continuous current and supports high crank-amp demands up to 900A peak, suitable for most automotive and marine starting systems. Its tin-plated copper terminals offer enhanced conductivity and corrosion resistance in damp or salty environments.

• 300A continuous current rating for heavy loads
• 900A crank capability for starting engines
• Marine-grade, tin-plated copper terminals for reliable contact

How easy is it to install and secure against tampering?

The MOTOFLEX switch is engineered for simple mounting with included hardware and a low 1½-inch height to fit tight spaces. The large red knob is removable to prevent unauthorized operation, and the package contains bolts and an installation guide to speed setup.

• Compact 1.5-inch height for limited-clearance engine bays
• Removable knob deters tampering or accidental switching
• Mounting hardware and install guide included for quick setup

Is this switch built to withstand tough conditions?

Constructed with PA66 housing and heavy-duty terminals, the switch tolerates temperature extremes and marine exposure better than typical consumer switches. The waterproof design and corrosion-resistant contacts make it suitable for boats, off-road vehicles, and outdoor equipment where moisture and salt can be issues.

• PA66 housing rated for -40℉ to 284℉ operational temperature range
• Waterproof body and corrosion-resistant terminals for marine use
• Durable mechanical construction for long-term reliability

Who is this for? MOTOFLEX’s ON/Off Battery Disconnect Switch is ideal for owners of cars, trucks, RVs, boats, golf carts, jet skis and other battery-powered equipment who need a reliable, no-electronics way to isolate their battery. It suits DIY installers and professional mechanics who want a compact, high-current switch that resists corrosion and prevents unauthorized use. Note: switching the battery off will cut power to systems that store settings or memory (for example, radios), so plan for potential resets after reconnecting.