Square D LAL26400 Molded Case Circuit Breaker

Yes, it features a fixed thermal element for long-time overload protection and an adjustable magnetic dial for instantaneous short-circuit protection. This adjustability allows you to coordinate the breaker with downstream devices and specific inrush currents.

It is a unit-mount circuit breaker designed to bolt directly into switchboards, motor control centers, or standalone industrial enclosures. It requires physical wire connections at both the line and load ends, making it distinct from Square D I-Line breakers that plug directly into a busbar.

The breaker comes factory-equipped with lugs that allow for two distinct wiring configurations per phase. You can terminate a single large conductor from 1 AWG up to 600 kcmil, or run parallel smaller conductors using two wires sized between 1 AWG and 250 kcmil. Both aluminum and copper wiring are supported.

Yes. Beyond its standard AC ratings, this L-Frame breaker is certified for use on 250V DC systems, providing up to 10kA of interrupting capacity. This makes it suitable for industrial DC control applications.

The breaker features a built-in push-to-trip button on the front face. Pressing this button manually actuates the mechanical tripping mechanism, allowing electricians to verify proper operation without needing to expose live electrical parts.

Yes. As a legacy L-Frame device, the LAL26400 serves as an exact dimensional and functional replacement for older Square D LA and LAL series 2-pole, 400A unit-mount circuit breakers found in existing installations.

Yes, this L-Frame breaker supports several optional add-ons, including shunt trips for remote tripping operations, undervoltage releases, as well as auxiliary and alarm switches for system monitoring.