300A Dual-Circuit Battery Isolator Switch | 3-Position IP66
300A Dual-Circuit Battery Isolator Switch | 3-Position IP66
300A Dual-Circuit Battery Isolator Cut-Off Switch — 3-Terminal, 3-Position, IP66 Waterproof
Take full control of your electrical system with this heavy-duty 300A Dual-Circuit Battery Isolator Switch. Engineered for marine vessels, RVs, cars, trucks, and trailers, this 3-position (OFF-1-2) disconnect switch lets you isolate or switch battery circuits with ease — protecting your vehicle's electrical system when it's stored or in an emergency situation.
Made in Mainland China.
Why Choose This Battery Isolator Switch?
- Powerful 300A Capacity: Handles 300A continuous current (500A for 5 minutes, 900A for 30 seconds), making it suitable for high-demand marine and RV applications.
- Dual-Circuit Design: 3-position (OFF-1-2) selector allows you to switch between two independent battery circuits or cut all power instantly.
- IP66 Waterproof Rated: Fully sealed against water jets and dust — built to withstand harsh marine and outdoor environments.
- Superior Conductivity: ABS plastic housing with a red copper, silver-plated inner core for minimal resistance and maximum current transfer.
- Versatile Mounting: Supports surface, front panel, or rear panel installation — fits virtually any setup on boats, yachts, RVs, trucks, and modified vehicles.
- Safe Ignition Protection: Designed with gasoline-powered boat safety in mind, meeting marine installation standards.
- Clear Circuit Labeling: OFF-1-2 labeled actuator for instant, mistake-free operation even in low-light conditions.
Technical Specifications
| Continuous Current | 300A (500A / 5 min; 900A / 30 sec) |
| Maximum Voltage | 32V DC |
| Line Posts | 3 × M10 Studs |
| Gear Positions | 3 (OFF – 1 – 2) |
| Circuit Type | 2-Way Dual Circuit |
| Contact Type | Normally Closed |
| Waterproof Rating | IP66 |
| Mounting Type | Panel Mount (Surface / Front / Rear) |
| Shell Material | ABS Plastic |
| Inner Core | Red Copper, Silver-Plated |
| Compatible Applications | Marine, RV, Car, Truck, Trailer, Modified Vehicles |
What's in the Box?
- 1 × 300A Dual-Circuit Battery Isolator Cut-Off Switch
Safety & Standards Reference
For guidance on safe marine and automotive electrical installations, consult the U.S. Consumer Product Safety Commission (CPSC) for electrical safety best practices.
Frequently Asked Questions
Q: What does the 3-position setting (OFF-1-2) mean on this battery isolator switch?
A: The three positions let you choose which battery circuit is active. OFF cuts all power completely, 1 connects Circuit 1 only, and 2 connects Circuit 2 only. This dual-circuit design is ideal for boats and RVs with two separate battery banks, giving you full control over power distribution.
Q: Is this battery cut-off switch truly waterproof for marine use?
A: Yes. This switch carries an IP66 waterproof rating, which means it is fully protected against powerful water jets from any direction — making it well-suited for marine vessels, boats, yachts, and any other wet or outdoor environment.
Q: What vehicles and applications is this isolator switch compatible with?
A: This 300A battery isolator is compatible with a wide range of vehicles and equipment, including marine boats, yachts, RVs, motorhomes, cars, trucks, trailers, and modified vehicles. Its panel-mount design and flexible installation options make it easy to fit in virtually any electrical panel.
Q: Can this switch handle high-current starting loads?
A: Absolutely. While the continuous rating is 300A, this switch is engineered to handle 500A for up to 5 minutes and 900A for up to 30 seconds, covering the high surge currents typical of engine starting and heavy electrical loads.