Square D KH26150 Molded Case Circuit Breaker

This breaker is designed exclusively for Square D I-Line panelboards and switchboards. The I-Line plug-in mounting style allows it to attach directly to the internal busbar system.

The breaker features plug-in jaws on the line side that press directly onto the I-Line bus stack. It is then secured to the panelboard backpan with a mounting bracket, providing a solid electrical and mechanical connection without separate bus wiring.

The adjustable magnetic trip allows you to set the instantaneous short-circuit pickup level. This helps coordinate the breaker with downstream devices and specific load inrush currents, while the thermal element provides fixed overload protection.

The KH series is a legacy K-frame circuit breaker. While it remains available for maintaining existing I-Line panelboards, Schneider Electric recommends the PowerPact H-frame series, such as the HGA261502, for modern replacements and new installations.

Yes, the standard factory lugs are dual-rated for both aluminum and copper conductors ranging from 4 AWG to 350 kcmil. Always apply a listed oxide inhibitor when terminating aluminum wiring and follow the torque specifications printed on the breaker faceplate.

No. Because this is an I-Line style breaker, it features plug-in jaws on one end for the busbar connection and wire lugs on the other. This physical design dictates a specific line and load orientation, meaning it cannot be reverse fed.