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Challenger Interlock Kits

Our Challenger Interlock Kits are specially designed to work with your Challenger electrical panel. Each of our Kits acts like a manual transfer switch, allowing you to safely and easily connect your generator to your electrical panel. Better yet: Our Kits are easier and take less time to install than traditional transfer switches. As a result, you’ll pay less for a professional electrician to install your Kit.

Need assistance finding the right Kit for your Challenger electrical panel? Let us know. We’re always at your service!

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Siemens / GE / Square D Westinghouse / Thomas & Betts Westinghouse / Thomas & Betts
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 Kit performs like a manual transfer switch for Westinghouse, Thomas & Betts, and Challenger electrical panels; requires:

  • Horizontal (left-right) throw
  • Two-handle breaker
  • Offset 1¼" left of center of breaker columns
  • Distance from columns: 1" (above)
Space between breaker columns: ½"; two panel spaces required for this Kit.

Kit Installation Instructions
This Interlock Kit mounts to Westinghouse, Thomas & Betts, and Challenger electrical panels and requires:

  • Vertical (up-down) throw
  • Four-handle breaker
  • Centered under both breaker columns
  • Distance from columns: 1¼" (below)
Space between breaker columns: ½"; two panel spaces required for this Kit.

Kit Installation Instructions
Westinghouse / Thomas & Betts /
This Kit performs like a manual transfer switch for Westinghouse, Thomas & Betts, and Challenger electrical panels with the following features:

  • Vertical (up-down) throw
  • Two-handle breaker
  • Offset to the left of the breaker column
  • Distance from column: 4½" (above)
Single column of breakers; two panel spaces required for this Kit.

Kit Installation Instructions