SENTRON T55 1-pole MCB, 25 A, C-curve — fit and ratings
Overvoltage category 3 and energy limiting class 3 confirm it's rated for fixed-installation use downstream of the utility meter. Rated for AC/DC supply voltage, though the 3 kA breaking capacity is stated for AC only. The single-pole design (1P) does not switch the neutral — confirm your circuit requires only phase protection. Installation depth is 55 mm, fitting standard 18 mm modular-width enclosures. IP20 rated, so it belongs inside a closed distribution board or panel, not exposed to washdown or dust.
Panel integration — DIN-rail fit
One width unit (18 mm) and 55 mm depth leave room for adjacent breakers and wiring ducts in a typical distribution board. No neutral-switching function, so the neutral bar or busbar must be continuous through the enclosure. IP20 with connected conductors — wire it inside a closed panel only.