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Square D QON612L100 mounting base, rectangular grey plastic housing with six breaker slots, 2.35 by 6.06 by 5.24 inches

SQUARE D

SQUARE D QON612L100 Mounting Base Circuit Breaker

SKU CH-X48Y-YM03P

A mounting base with six spaces for Square D QO circuit breakers, measuring 2.35 in long, 6.06 in wide and 5.24 in deep

  • Mounting base designed for Square D QO circuit breakers
  • Six breaker spaces allow multiple circuit protection points
  • Compact 2.35 in length fits tight panel layouts
  • 06 in width provides stable mounting surface
  • 24 in depth ensures secure breaker engagement

Mounting Base for QO Breakers

The SQUARE D QON612L100 mounting base accepts Square D QO circuit breakers in a six-space layout. It measures 2.35 in long by 6.06 in wide by 5.24 in deep. The unit ships new and includes the mounting base only.

Replaces Worn or Damaged Bases

This part replaces a failed or outdated mounting base in an existing QO load centre. The upgrade is worth it when the original base shows corrosion, cracked insulation or loose breaker retention. It restores secure breaker mounting without replacing the entire panel.

Fits Standard QO Load Centres

The base installs into compatible Square D QO enclosures using the factory hole pattern. It frees up the installer from fabricating custom brackets and keeps breaker spacing consistent with the original design. No additional hardware is included beyond the base itself.

Highlights

  • Mounting base designed for Square D QO circuit breakers
  • Six breaker spaces allow multiple circuit protection points
  • Compact 2.35 in length fits tight panel layouts
  • 06 in width provides stable mounting surface
  • 24 in depth ensures secure breaker engagement

Specifications

BrandSQUARE D

Questions about this item

What are the exact length, width and depth measurements of the QON612L100 mounting base?

The mounting base measures 2.35 in long, 6.06 in wide and 5.24 in deep, so verify your panel cut-out against those dimensions before ordering.

How do you secure a Square D QO breaker onto the QON612L100 base, and what step is often missed?

Snap the QO breaker onto the base’s six mounting spaces, then tighten the base’s own mounting screws to the panel; installers sometimes forget the base screws and rely on the breaker clip alone.

When should the QON612L100 mounting base itself be replaced rather than just the breaker?

Replace the base if the mounting slots show cracking, the metal rails are corroded, or a breaker no longer locks firmly into any of the six spaces.

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