Line protection MCCB for 50 A feeder circuits
It carries a continuous current rating of 50 A up to 45 °C ambient, then derates to 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C — so the full 50 A holds through most ventilated enclosures, but a hot panel corner above 55 °C knocks off an amp or two. Breaking capacity is 121 kA at 240 VAC and 75.6 kA at 415 VAC — numbers that put it well into high-fault-duty territory for commercial and light industrial mains. It is a straightforward, hard-wired breaker for a 50 A feeder where you need the interrupting rating and do not need the accessories. The front carries IP40 protection — fine for a dry indoor panel, not for washdown. Dimensions are 130 mm high, 50.8 mm wide (2 inches — standard 2-pole MCCB width), 70 mm deep. Power loss at rated load is 9.74 W, which matters for thermal budgeting in a dense enclosure.
The 50.8 mm width (2 inches) matches the footprint of most 2-pole MCCBs in the SENTRON family, so it swaps into an existing cutout or busbar arrangement without re-drilling. IP40 on the front means the breaker face is protected against solid objects over 1 mm — standard for a closed cabinet.