M-750 Series - Battery Selector/Master Disconnect Switch

Series: M-750
M-750
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m-750 m-750-bp

For any vehicle that needs to use two batteries where one battery is used for starting the engine, while the other is used to power auxiliary loads. This is a common situation in trucks, boats, RVs, police and rescue vehicles, and in ambulances or fire equipment. A selector switch allows use of the first battery, the second battery, or both batteries simultaneously. This provides back-up starting power in an emergency.


Features

These switches combine the functions of Battery Selector and Master Disconnect Switches to give four battery power options:
  • Power cut off at the source
  • Power On, Battery 2
  • Power On, Battery 1
  • Power On, both Batteries

Battery selector switches provide a positive battery disconnect, which has many advantages:
  • It gives a reliable shutdown of power during maintenance
  • The version with the key protects against theft of the vehicle, when unattended
  • It helps protect against electrical fires, when the vehicle is not in use, and minimizes battery drain

Specifications

  • Rating: 500A intermittent, 310A continuous, 6-36V DC Electrical ratings on UL labels are conservative. Electrical Ratings Labeled UL 707B
  • Use with either alternators or generators.
Make before break design permits operation through the three On positions with the engines running. Engines should always be shut down before turning to Off.

Heavy-Duty Construction Vaporproof, weather-, dust- and corrosion-resistant.
Durable, fracture-resistant high temperature plastic case, knob and insulator.
Switches conform to USCG section 183.410 for ignition protection.
Resistant to impact, and temperature extremes.
Heavy duty copper stud terminals, with brass hexnuts.
Can be surface mounted, or installed through a 3 5/16" diameter hole in the panel.
Dimensions: Flange: 6" (152.4mm) diameter, overall height 2 5/8" (66.7mm).
Terminals: 3 copper studs, 3/8" (9.5mm) diameter. Offsite info on Marine Power Generation Offsite info on Marine Dual Battery Wiring

Access specifications, certifications, check availability and order parts below

Catalog #PackagingDescriptionUL listedRatingTerminalsActuatorCaseSizeInstallationOverall heightVoltage Rating MaxMax total continuous currentInrush rating (2 seconds)Terminal sizeContact MaterialsCompare
M-750BulkBattery Disconnect Switch 310A 36V SPSTMarine UL Listed6-36V DC; 310A Continuous 500A intermittentthree 3/8 copper studsPlastic KnobEngineering thermoplastic6 flange diameterSurface Mount
Through-Hole 3-5/16
2-5/836V310A500A3/8/24Copper
M-754BulkBattery Disconnect Switch 310A 36V SPST w/pilot lightMarine UL Listed6-36V DC; 310A Continuous 500A intermittentthree 3/8 copper studsPlastic KnobEngineering thermoplastic6 flange diameterSurface Mount
Through-Hole 3-5/16
2-5/836V310A500ACopper
M-750-BPBlister PackBattery Disconnect Switch 310A 36V SPSTMarine UL Listed6-36V DC; 310A Continuous 500A intermittentthree 3/8 copper studsPlastic KnobEngineering thermoplasticSurface Mount36V310A500A3/8/2024Copper
M-754-BPBlister PackBattery Disconnect Switch 310A 36V SPST w/pilot lightMarine UL Listed6-36V DC; 310A Continuous 500A intermittentthree 3/8 copper studsPlastic KnobEngineering thermoplasticSurface Mount36V310A500ACopper
M_751
Obsolete: 2018 -01-11
With lockMarine UL Listed6-36V DC; 310A Continuous 500A intermittentthree 3/8 copper studsPlastic KnobEngineering thermoplastic6 flange diameterSurface Mount
Through-Hole 3-5/16
2-5/836V310A
M_752
Obsolete: 2018 -01-11
With alternator field disconnectMarine UL Listed6-36V DC; 310A Continuous 500A intermittentthree 3/8 copper studsPlastic KnobEngineering thermoplastic6 flange diameterSurface Mount
Through-Hole 3-5/16
2-5/836V310A
M_753
Obsolete: 2014 -12-20
With lock and alternator field disconnectMarine UL Listed6-36V DC; 310A Continuous 500A intermittentthree 3/8 copper studsPlastic KnobEngineering thermoplastic6 flange diameterSurface Mount
Through-Hole 3-5/16
2-5/836V310A
M_754-01
Obsolete: 2015 -01-14
With pilot and pilot circuitMarine UL Listed6-36V DC; 310A Continuous 500A intermittentthree 3/8 copper studsPlastic KnobEngineering thermoplastic6 flange diameterSurface Mount
Through-Hole 3-5/16
2-5/836V310A

pdf icon M-750 Series Switches 2D Prints

Part Numbers: M-750 M-751 M-752 M-753 M-754

pdf icon M-750 Battery Selector Disconnect Switch Datasheet

Part Number: M-750 - Replaces Hotfeed D-598