Square D LA34225MC Molded Case Circuit Breaker

No. This breaker features an I-Line plug-on connection designed specifically for commercial and industrial Square D I-Line panelboards and switchboards. It will not fit in standard residential load centers.

The factory lugs support multiple configurations. They can accept a single 1 AWG to 600 kcmil conductor or two 1 AWG to 250 kcmil conductors per phase, and are rated for both aluminum and copper wiring.

The LA34225MC features a fixed thermal element for standard overload protection, paired with an adjustable magnetic element. This allows electricians to manually tune the instantaneous trip threshold to coordinate with downstream devices and handle specific short-circuit requirements.

The LA frame is part of the legacy molded case circuit breaker line from Square D. While modern facility upgrades often replace these with the PowerPact J-Frame series, the LA34225MC remains a direct replacement for existing I-Line panels requiring the original footprint.

No. Because it utilizes the I-Line plug-on design, the breaker mounts directly onto the bus assembly of an I-Line panelboard without the need for separate bolt-on hardware kits or mounting brackets.

The MC suffix designates this as a Mission Critical circuit breaker. It features a high magnetic withstand rating, making it suitable for demanding applications like data centers and critical power distribution systems where preventing nuisance tripping is essential.

In the Square D legacy L-frame family, LA breakers like the LA34225MC feature an I-Line plug-on connection designed for panelboards. LAL breakers are unit-mount devices that feature standard lugs on both the line and load sides for feed-through applications.