What this MCCB brings to a panel
The ETU550 electronic trip unit gives you adjustable long-time delay (tr 0.5–25 s) and short-time delay (tsd up to 0.5 s), which means you can coordinate selectivity downstream without sacrificing fault clearance speed. Breaking capacity hits 330 kA at 240 V and 242 kA at 415/440 V, so it handles high-fault utility feeds or transformer secondaries without cascading upstream. Three-pole construction, line protection version — this is the main feeder or large subfeed breaker in an industrial distribution panel.
The 0.84 W maximum power loss means negligible heat contribution to the enclosure thermal budget.
Long-time pickup is fixed at the 25 A rated current; short-time delay adjustable up to 0.5 s lets you ride through motor-start inrush or transformer magnetizing current without nuisance tripping.