What this 1-pole C-curve MCB does in the panel
The single-pole (1P) form factor occupies one width unit on the DIN rail; installation depth is 55 mm, so it sits flush in standard consumer units and sub-distribution panels.
Drop-in check vs the 1.6 A sibling 5SQ2170-2YA15
The closest functional peer is 5SQ2170-2YA15 — same SENTRON T55 family, same 1-pole C-curve, same 55 mm depth, same 3 kA breaking capacity. The only difference is the current rating: 10 A on this code versus 1.6 A on the sibling. Both share the identical mechanical footprint and DIN-rail clip, so a panel specified around the 1.6 A version accepts the 10 A unit without rewiring. The swap is valid only if the downstream load and cable sizing support the higher rating.
The MCB carries an IP20 protection class (finger-safe terminals, no washdown rating). Overvoltage category 3 and energy limiting class 3 are specified per IEC/EN 60664 and EN 60898 respectively. Neutral conductor switching is not built in — this is a live-pole-only device. For compliance documentation (CE marking, RoHS, REACH, UL listing), the manufacturer's declaration applies to the SENTRON T55 series; confirm the specific certificate for this order code at quote time.