Square D FC34025 Molded Case Circuit Breaker

This breaker utilizes the Square D I-Line plug-in connection system. Instead of bolting directly to the bus, the line side features jaws that push directly onto the panelboard busbars. This design reduces installation time and allows for easier phase balancing in compatible switchboards.

Because it is an I-Line breaker, the line side connects directly to the panelboard bus via plug-on jaws. The load side includes factory-installed mechanical lugs that accept 14 AWG to 4 AWG copper or aluminum wire for terminating the branch circuit.

No, the FC34025 is exclusively compatible with Square D I-Line panelboards and switchboards. The proprietary plug-in jaw design will not safely or physically connect to busbars from other manufacturers or standard bolt-on enclosures.

Yes. While the FC34025 is rated for a maximum of 480VAC, it is fully compatible with 240V and 208V electrical systems. When applied at these lower voltages, the interrupting capacity increases from 65kA to 100kA, providing enhanced short-circuit protection.

While they share the same physical dimensions and 25-amp 3-pole configuration within the legacy F-Frame family, the FC34025 features a much higher interrupting rating. The FC series is rated for 65kA at 480VAC, compared to 18kA for the FA34025 and 25kA for the FH34025, making it the required choice for systems with elevated available fault currents.

No, the trip mechanism is fully fixed. Both the long-time thermal overload protection and the instantaneous magnetic short-circuit protection are factory calibrated for 25 amps and cannot be adjusted in the field.

Yes, this model belongs to the legacy Square D F-Frame family. While Schneider Electric has introduced the PowerPact B-Frame and H-Frame series for new designs, the FC34025 remains essential for maintaining or expanding existing I-Line panelboards without requiring a full panel upgrade.

Although I-Line plug-on breakers are designed to physically snap onto the bus, you must follow NFPA 70E safety protocols and completely de-energize the panelboard or switchboard prior to installation. Proper lockout-tagout procedures and personal protective equipment are mandatory for electrical safety.