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Square D Interlock Kits

We’ve specially designed several Interlock Kits to work with Square D electrical panels. Each Kit acts like a manual transfer switch, allowing you to quickly, easily, and safely connect your portable generator to your home’s electrical panel. Compared to standard transfer switches, our Kits can be installed more quickly so your installation costs should be lower, too.

We’re proud to say that our Interlock Kits are made here in the USA.

Is there anything else we can tell you about our Square D Kits? Call us – we’re at your service!

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This Kit performs like a manual transfer switch for Siemens, ITE, Murray, Cutler Hammer, and Square D electrical panels; requires:

  • Horizontal (left-right) throw
  • Four-pole breakers
  • Sits in middle of breaker column
  • Distance from columns: 0"
Two panel spaces required for this kit.

Kit Installation Instructions
This Kit mounts to Siemens, GE, Square D, Cutler Hammer, Thomas & Betts, Challenger, Crouse-Hinds, and Westinghouse electrical panels; requires:

  • Horizontal (left-right) throw
  • Two two-pole breakers
  • Works in all four corners
Main: two-pole; generator: two-pole. Fits any feed-through panel with two double-pole 1" breakers.

Kit Installation Instructions
This Interlock Kit mounts to Square D electrical panels and requires:

  • Horizontal (left-right) throw
  • QO & Homeline panels
  • One-handle breaker
  • Centered over both columns
  • Distance from columns: 1¼ to 1¾" (above)
Space between breaker columns: ½"; two panel spaces required for this Kit.
Kit Installation Instructions
Square D Kit K-5210
Our Price: 149.95
Square D Kit K-5310
Our Price: 149.95
This Interlock Kit performs like a manual transfer switch for Square D electrical panels; requires:

  • Horizontal (left-right) throw
  • One-handle breaker
  • Centered over columns
  • Distance from columns: 1" (above)
Space between breaker columns: ½"; two panel spaces required for this Kit.

Kit Installation Instructions
This Kit performs like a manual transfer switch for Square D electrical panels; requires:

  • Vertical (up-down) throw
  • One-handle breaker
  • Centered over columns
  • Distance from columns: 3" to 3½" (above)
    Space between breaker columns: ½"; two panel spaces required for this Kit.

    Kit Installation Instructions
    This Kit mounts to Square D electrical panels and requires:

    • Horizontal (left-right) throw
    • Four-handle breaker
    • Centered over columns
    • Distance from columns: 2½" (above)
    Space between breaker columns: ½"; two panel spaces required for this Kit.

    Kit Installation Instructions
    Square D Kit K-5410
    Our Price: 149.95
    This Interlock Kit mounts to Square D electrical panels and requires:

    • Vertical (up-down) throw
    • One-handle breaker
    • Centered over columns
    • Distance from columns: 3½" to 4" (above)
    Space between breaker columns: ½"; two panel spaces required for this Kit.

    Kit Installation Instructions
    This Interlock Kit is designed for Square D electrical panels with the following features:

    • QO configuration
    • Horizontal (left-right) throw
    • Two-pole breakers
    Main: two-pole; generator: two-pole. Fits any feed through panel with two double-pole ¾" breakers.


    Kit Installation Instructions