It handles 230 VAC and delivers a 50 kA interrupting capacity — that's the fault-clearing muscle for high-fault panels where standard 6–10 kA MCBs would weld shut on a dead short.
Compared to the S202M-C63 (63 A, same 2-pole DIN footprint, but only 6 kA interrupting), the S802S-C40 is the high-fault version — 50 kA vs 6 kA. If your panel SCCR requirement is above 10 kA, the S202M won't hold; this one will. Same rail, same wiring pattern, but the S802S-C40 is a different breaker family for high-available-fault installations.
The 2-pole format occupies two module widths — no special busbar or adapter needed. Spring-cage terminals accept 0.2–2.5 mm² solid or ferruled stranded; strip length 8 mm. Torque to 2.0 Nm.