The ENW22303 is a drawout chassis for the EasyPact NW range, rated 1250 A at 40 °C with 4 poles. It's the mounting frame that accepts the corresponding circuit breaker plug-in unit — you slide the breaker into this chassis, which stays wired to the busbars and cables. That drawout design means you can isolate and remove the breaker for maintenance or replacement without disturbing the power connections, which is standard practice in switchgear for industrial plants, data centers, and large commercial buildings where uptime matters.
The N breaking capacity code tells you the interrupting rating of the breaker that mates with this chassis; it's not a standalone spec on the chassis itself, but it defines the fault-clearing capability of the complete assembly. The 4-pole configuration covers three-phase plus neutral, which is required for TN-S or TN-C-S systems where you need to switch and protect the neutral conductor.
At 560 mm deep, 400 mm wide, and 440 mm tall, this chassis takes up a defined footprint in the switchgear lineup. The drawout mechanism requires clearance at the front for racking the breaker in and out — typically you need at least the depth of the chassis plus the breaker projection when withdrawn. Mounting is on the switchboard frame, not a DIN rail; the chassis bolts into the enclosure structure. Plan for busbar connections at the rear and control wiring for the breaker's auxiliaries.