The ENW22329 is a chassis for the EasyPact NW family, rated 2000 A at 40 °C. The N breaking capacity code tells you this chassis is designed for use with a specific range of EasyPact NW circuit breakers; it is not a standalone interrupter but the structural frame that accepts the switching mechanism and arc chutes. Drawout mounting means the breaker mechanism slides in and out of the chassis on rails, allowing safe isolation and removal without unbolting power cables. This is standard for switchgear where maintenance or quick replacement matters — the chassis stays wired to the bus, the moving portion comes out.
The chassis measures 445 mm deep, 400 mm wide, and 440 mm high. These are the envelope dimensions for the fixed portion — the drawout cradle that mounts in the switchgear cubicle. Panel builders need to account for the cutout and the clearance for the racking mechanism on the front face.