The C-curve trips between 5 and 10 times rated current, so a 4 A breaker clears faults in the 20–40 A range, which matches the let-through of most domestic and small commercial loads. Rated for AC/DC supply voltage and overvoltage category 3, this breaker is suitable for fixed-installation panels where transient overvoltages from the mains are expected. The 55 mm installation depth and 3 width units mean it occupies 3 x 18 mm on a DIN rail — standard for a 3-pole MCB in a SENTRON distribution board. IP20 finger-safe protection is adequate for enclosed panel mounting; no additional touch protection is needed once the cover is on.
Snap-on DIN rail mounting per EN 60715. The 55 mm depth leaves clearance behind the gland plate for wiring; no deep enclosure required. Neutral conductor switching is not integrated — the 3-pole version switches only the phases, so a separate neutral bar or 4-pole breaker is needed if neutral isolation is required. The energy limiting class 3 means this breaker limits let-through energy to a level that protects downstream wiring under fault conditions up to its 3 kA rating.