Square D KH26225AC Molded Case Circuit Breaker

The "AC" suffix indicates the breaker's phase connection configuration. It is designed to connect specifically to the A and C phases on a Square D I-Line panelboard or switchboard bus.

The KH26225AC is a legacy K-Frame breaker. For modern facility upgrades or direct replacements, it is typically substituted with the Square D PowerPact J-Frame equivalent, such as the JJA26225, which mounts into the same I-Line panelboards.

The breaker features an I-Line plug-on design. It is installed by placing the mounting bracket into the panel's key slots, using a screwdriver in the mounting pin slot to ratchet the breaker firmly onto the busbar stack, and then tightening the retaining screw to secure it to the backpan.

Yes, this breaker is HACR rated, meaning it is certified to provide safe overcurrent protection for heating, air conditioning, and refrigeration equipment that requires handling motor starting surges.

Yes, the KH26225AC shares the same physical dimensions and I-Line mounting footprint as other legacy K-Frame breakers like the KA and KC series. When replacing a breaker, always ensure the KH's 35kA at 480V interrupting rating meets or exceeds your system's available fault current.

No, this breaker is specifically designed with an I-Line style plug-in connection. It is only compatible with Square D I-Line panelboards and switchboards, and will not fit in QO, NQ, or NF series panels.

This breaker features a thermal-magnetic trip unit with LI functions. It provides fixed Long-Time (L) protection for sustained overloads and an adjustable Instantaneous (I) magnetic element for short-circuit protection, allowing for coordination with other protective devices.

The KH26225AC is calibrated for continuous operation in an ambient temperature of 40 degrees C (104 degrees F), which is standard for most commercial and industrial enclosed circuit breakers.

Yes, it features a visual trip indicator. When the breaker trips due to an overcurrent or short circuit, the handle moves to a center tripped position, making it easy to identify the faulted circuit in a multi-breaker panel.

Yes. While it mounts into a 3-phase I-Line panelboard, this 2-pole breaker draws power exclusively from the A and C phases of the bus to supply 240V or 480V single-phase loads.