300 Amps Battery Isolation Switch, 4 Position Disconnect Switch, 12V/24V Dual Battery Isolator Switch for Car, RV, Marine Boat, 4 Position Disconnect Power Kill Switch Rotary Tool Battery Master Switch 300 Amp Control M10.

The high quality main disconnect switch for your vehicle and marine. It perfectly works ranging from voltage DC 8V to DC 50V, and  with rating capacity - 1000 Amps Intermittent, 200 Amps continuous at Dc12V.

Specification:

Position: 4 positions, 1-2-Both-Off.
Voltage: 8V - 50V DC
Current Rating: 200A(12V), 150A(24V), 75A(48V)
Base Size: 2.66inch x 2.66inch (68mm x 68mm) 
Height: 2.90"inch(74mm) 
Terminal studs: 3.6inch (8mm) diameter
Electrical life: 10000 cycles
Rated current and voltage: 300A 60V DC 
Contact resistance: 50mΩ
Insulation resistance: 100MΩ
Dielectric strength: 1500VAC / 1min 

Features:

Ignition protected - Safe for installing aboard gasoline powered boats or vehicles.Disconnect before break contact, allows switching control between battery banks without power interruption.Offers a simple economic way of isolating battery
Heavy-duty design, High-quality
Easy Installation - Comprehensive wiring diagram and installation guide.