300A 12V Battery Disconnect Switch Master Isolator for Car, Boat, RV, ATV
Meet the 300A 12V Battery Disconnect Switch Master Isolator — a rugged, reliable solution designed to safely isolate the battery on cars, boats, RVs, ATVs, trailers, and other electrical systems. When a vehicle or vessel sits idle, parasitic drain can sap a battery and complicate startup. This high-current disconnect switch sits in the negative battery line and lets you cut power with a simple 90-degree turn, preventing leakage, reducing corrosion risk, and giving you confidence in any storage or emergency scenario.
Engineered for tough conditions, it supports 12–60V DC systems and delivers continuous operation up to 300A, with a powerful instantaneous surge of 1000A and an overload threshold of 200A. Built from a durable blend of copper, iron, rubber, and plastic, it’s designed for long life (up to 100,000 cycles) and dependable performance in demanding environments. Its universal design makes it suitable for ATVs, trailers, off-road vehicles, RVs, trucks, heavy equipment, boats, and more. Installation is straightforward on the negative wire, but you’ll need one extra wire for a clean, secure setup. Note that installation guides are not included, and professional installation is recommended to avoid damage or warranty issues.
All electronic and mechanical equipment, devices and machines sold by InterCyprus to EU countries are CE certified and carry a two year warranty.
Benefits & Tips
- Safeguard battery life during storage: Isolate the negative terminal to prevent parasitic drain and keep your battery ready for when you need it.
- Fast, secure power-off: The 90° rotary action allows quick disconnection in everyday use or during maintenance.
- Versatile for multiple vehicles and gear: Ideal for ATVs, trailers, RVs, boats, and heavy equipment—just verify the size and fit for your setup.
Product specifications
- Brand: PQY
- Item Type: Battery Switch / Master Isolator / Circuit Breaker Power Switch
- Material: Copper / Iron / Rubber / Plastic
- Color: As Picture
- Rated current: 300A (12V)
- Instantaneous current: 1000A (12V)
- Overload current: 200A
- Working voltage: 12–60VDC
- Rotary degree: 90°
- Life time: 100,000 cycles
- Installation principle: Installed on the negative wire of the electrical system (prepare one more wire than the original system)
- Compatibility: Universal (check size/type to match your needs)
Package includes:
- 1x Mount Kit. (100% Brand New Never Used Or Installed)
Warnings / Reminders
- No installation guides are included; we highly recommend seeking professional installation. Any damage during installation will not be refunded.
- Will come with everything you see in the picture. Please allow differences due to manual measurement.
- Please check that the picture matches before purchase. Color may vary slightly due to monitor settings.
Trust and reliability are built into every InterCyprus purchase. At intercyprus.com since 2002 — trusted for quality and reliability.