Description
The M-750 Series 36V 310A Dual-Battery Selector &
Master Disconnect Switch is ideal for boats, emergency
vehicles, buses, heavy trucks, and RVs that use one
battery for starting the engine and another battery to
power auxiliary loads.
This automotive and marine battery selector switch has
single-pole, triple-throw (SP3T) circuitry, which gives you
four options: batteries OFF, battery 1 ON, battery 2 ON, or
both batteries ON simultaneously.
The battery cutoff position ensures reliable battery
disconnection to protect against electrical fire, tampering
or theft, and battery drain, while the selector switch
positions allow for maximum starting power and backup
starting power during emergencies.

Applications
• Boats
• Emergency Vehicles
• Heavy Trucks
• Buses
• RVs

Features and Benefits
• 500A intermittent current at 12V dc for up to 5 minutes
and 310A maximum continuous current
• Single-pole, triple-throw (SP3T) switch allows you to use
one of two batteries or both batteries at the same time,
which enables maximum starting power
• Functions either with alternators or generators
• 3/8"-24 copper studs are solidly machined to the contact
plates
• High-performance rubber O-ring keeps water, dust, and
contaminants out
• Rugged polyester thermoplastic case and large, easy-togrip
knob stand up to impacts
• Designed with a flange for flush mounting or throughpanel
mounting
• Make before break design permits operation through the
ON positions with the engine running
• Available with or without a pilot light circuit
• UL and CE certified