Battery Master Switches

For over forty years Cole Hersee has been manufacturing heavy duty battery master switches that have been installed as OE equipment by leading manufacturers of heavy duty vehicles.

Battery master switches shut down a vehicle’s electrical system by cutting off current from the battery. They are designed to help prevent tampering, theft, battery drain and electrical fires.

Battery master switches are available with brass or plated steel cases and are actuated by lever or hencol key. Contacts are either silver or copper. O-rings feature in the operating shaft of some models for additional moisture and dirt protection.

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  • Battery Master Switches

    M290-05BX – Marine Battery Master Switch DPST On/Off

    This marine grade battery master switch will disconnect the battery and the alternator or generator field circuit.

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  • Battery Master Switches

    M750 – Dual Battery Switch Selector And Disconnect

    This dual battery selector/master disconnect switch will suit 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. UL rating 707B .

    This is a common situation in trucks, boats, RVs, police and rescue vehicles, and in ambulances and 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. Either or both batteries can be selected for energizing.

    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.

    Electrical Ratings Labeled UL 707B. Rating: 500A intermittent, 310A continuous, 6-36V DC Electrical ratings on UL labels are conservative.
    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.

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  • Battery Master Switches

    Dual Battery Key Switch Select Discon

    This removable key dual battery selector/master disconnect switch will suit 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. UL rating 707B .

    This is a common situation in trucks, boats, RVs, police and rescue vehicles, and in ambulances and fire equipment.

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  • Battery Master Switches

    Dual Battery Switch Selector And Alt Field

    This dual battery selector/master disconnect switch will suit 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. UL rating 707B .

    This is a common situation in trucks, boats, RVs, police and rescue vehicles, and in ambulances and fire equipment.

    Alternator field disconnect circuit switch prevents possible alternator diode failure if the switch is accidentally turned
    to Off with the engines running.

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