It ships without a control unit (you add the trip unit separately), making it a shell for high-current main or tie breaker positions in switchboards rated to 690 V AC. The Ics (service breaking capacity) matches at 200 kA at the same voltage, so it can reclose after a fault at full rated interruption without derating. At 690 V AC the Icu drops to 75 kA, still substantial for most industrial services. Rated 800 A at 50 °C ambient, this frame handles the main feed for a large MCC or a secondary distribution transformer. The withdrawable design (racked in/out via the backplate mounting) simplifies maintenance isolation — pull the cradle to isolate, no need to disconnect power cables.
The C080B4WM is listed as current production. It is the basic frame for the ComPacT NS800LB range.
The 800 A rating is at 50 °C; higher enclosure temperatures require derating. The frame is IP40, IK07, and pollution degree 3. Mechanical durability is 10,000 cycles; electrical durability ranges from 2,000 to 4,000 cycles depending on voltage and current (In vs In/2). That is typical for a drawout frame — it is built for infrequent switching (main breaker duty), not daily motor starting.
Integration notes
Mounts on a backplate with a 70 mm connection pitch. The withdrawable cradle requires cutout dimensions matching the 306 mm width × 260 mm height × 147 mm depth. Neutral is on the left. The frame is manually operated — no motor operator included, though one can be added later via the accessory slots.