Master Disconnect Switch
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Master Disconnect Switch Master Disconnect Switch
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CARQUEST by BWD Master Disconnect Switch

Part No. S640 Warranty Details  

Fit of this part varies by vehicle & equipment specs Type of Fit

CARQUEST by BWD is an aftermarket leader, providing a premium line of engine management products. BWD manufactures and distributes high technology critical components for late model domestic and import vehicles. BWD is constantly evolving to give customers the competitive edge they need to compete in today’s ever-changing marketplace.

Product Features:
  • Our switches are designed using copper alloy conductors to ensure superior electrical conductivity with low resistive losses.
  • Our parts are 100% tested to verify both mechanical and electrical switching performance.
  • Decades of industry leading research and development focused on meeting the technicians needs
  • Our switches feature a robust design with high grade materials to meet the stringent demands of today's service professional
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Connector Gender:Female

Do you have questions about this product?


Ask a question, get answers from real customers and in-house experts. For further assistance, please review your support options on our Contact Us page.

2 Questions | 2 Answers
Displaying questions 1-2
  • Q:

    How many amps is this rated for?
    Asked on 8/9/2013 by Brett from Austin, TX

    1 answer



      The BWD Multi Purpose Switch (Part No. S640) amperage rating is 175A in continuous duty and 800 A in intermittent duty. For any further assistance, please feel free to call us at: 1-877-238-2623 or visit the nearest Advance Auto Parts store and one of our Parts Pros will gladly assist you with any questions or concerns you may have.

      Answered on 8/12/2013 by Steve from AAP
  • Q:

    Is this a universal product that will fit any car?
    Asked on 12/5/2009 by Dave

    1 answer

    • A:

      Yes, this is a universal product. It is designed to kill all power to your vehicle. The larger post go to the battery while one smaller one goes to the alternator and one is a ground.

      Answered on 2/3/2010 by Dave from Salisbury
Displaying questions 1-2

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