The LA400F is a NEMA 1 steel enclosure designed to house LAL/LHL/Q4L circuit breakers in either 2-pole or 3-pole configurations. It mounts flush and accommodates breaker ratings from 125 to 400 A. The enclosure dimensions are specified at 42.2 in (1073 mm) high, 13.7 in (349 mm) wide, and 7.2 in (184 mm) deep — these are the physical constraints a panel builder or integrator needs to verify against the intended cutout and clearance.
The 125...400 A rating is the breaker frame size the enclosure accepts; it does not describe the enclosure's own current-carrying capacity. The compatibility table confirms it fits LAL, LHL, and Q4L breakers in both 2-pole and 3-pole versions — no adapter plate or field modification is required for those families. Flush mounting means the enclosure front sits flush with the mounting surface; the steel construction provides the NEMA 1 environmental rating (indoor protection against dust and incidental contact).