800 A MCCB with ETU550 — selectivity and panel fit
The 800 A rating holds flat across the 40 °C to 60 °C ambient range — no derate needed until 65 °C (767 A) and 70 °C (703 A), which simplifies panel layout in warm enclosures. Breaking capacity runs 187 kA at 240 V, 121 kA at 415 V, and 53 kA at 690 V — numbers that put this in the high-fault tier for industrial mains distribution. The ETU550 offers adjustable long-time (Ir 0.5–1.0 x In), short-time (tsd 0.05–0.5 s), and instantaneous pickup, plus ground-fault protection is not built in (specified as 'without'). Physical footprint is 210 mm wide, 320 mm tall, 120 mm deep — a standard SENTRON 3VA frame size that fits existing 3VA panel cutouts. Front IP40 protection is adequate for enclosed switchboards; no IP rating on the rear or sides, so internal segregation within the panel matters.
The 210 mm width and 120 mm depth match the standard 3VA frame drilling pattern — drop-in compatible with existing SENTRON mounting plates and busbar systems. No rewiring needed if replacing a same-frame 3VA breaker; verify the lug kit matches the cable/ busbar termination (the order code does not include a specific lug kit, so that's a separate line item).