Square D FH26025AC Molded Case Circuit Breaker

The "AC" suffix indicates the phase connection. It means this 2-pole breaker is configured to connect to the A and C phases on a Square D I-Line bus.

The difference is the phase connection on the I-Line bus. The FH26025AC connects to the A and C phases, the FH26025AB connects to the A and B phases, and the FH26025BC connects to the B and C phases. All three are 25A, 2-pole breakers.

Yes, the FH26025AC can replace an FA26025AC. Both are F-frame I-Line breakers with identical physical dimensions and mounting. The FH series simply offers a higher interrupting capacity (AIC) than the standard FA series.

The FH26025AC is an I-Line plug-on circuit breaker designed for Square D panelboards, featuring a specific A and C phase connection. The FHL26025 is the unit-mount (lug-to-lug) version of the same breaker, typically used in control panels or individual enclosures.

The breaker features blow-on style plug-in jaws that connect directly to the I-Line bus. It is then mechanically secured to the panelboard's mounting pan using a built-in captive retaining screw, requiring only a standard screwdriver for installation.

The I-Line connection utilizes a blow-on jaw design. During a high-level short circuit, the magnetic forces generated actually force the jaws tighter against the bus bar, creating a more secure grip and ensuring a reliable connection when it is needed most.

The breaker features a built-in Push-to-Trip button on the front face. Pressing this button manually exercises the mechanical tripping mechanism without exposing the operator to live parts or requiring an actual overcurrent event.