M-750 SERIES
36V 310A DUAL-BATTERY SELECTOR
& MASTER DISCONNECT SWITCH
Specifications
Current Rating Continuous in Amps:
310A
Max Voltage Rating
Housing:
6-36V
Valox 325
3/8-24 Studs
Screws
3/8-24 Studs
3/8"
Input Terminals:
Mounting Method:
Output Terminals:
Mounting Hole:
Ignition Protection:
UL-94
M-750
Description
Applications
• Boats
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.
• Emergency Vehicles
• HeavyTrucks
• Buses
• RVs
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.
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
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.
• 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
Web Resources
Download 2D print, installation guide and technical
resources at: littelfuse.com/M-750
• Rugged polyester thermoplastic case and large, easy-to-
grip knob stand up to impacts
• Designed with a flange for flush mounting or through-
panel 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
Ordering Information
PART
NORMAL
DESCRIPTION
NUMBER
CIRCUITRY
ACTUATOR
Knob
POSITION
M-750
36V 310A Dual-Battery Selector & Master Disconnect Switch
SP3T, OFF-ON-BOTH ON-ON
SP3T, OFF-ON-BOTH ON-ON
Off
36V 310A Dual-Battery Selector & Master Disconnect Switch
- Blister Pack
36V 310A Dual-Battery Selector & Master Disconnect Switch
with Pilot Light Circuit
36V 310A Dual-Battery Selector & Master Disconnect Switch
with Pilot Light Circuit - Blister Pack
M-750-BP
Off
Off
Off
Knob
M-754
SP3T, OFF-ON-BOTH ON-ON
SP3T, OFF-ON-BOTH ON-ON
Knob
Knob
M-754-BP
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© 2022 Littelfuse, Inc.
080522-A
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