The Siemens 5SM3316-6KL is a 2-pole Type A residual current circuit breaker (RCCB) from the SENTRON family, rated at 63 A and 30 mA trip sensitivity on a 230 V AC supply. It's the kind of part you spec into a distribution board when you need reliable ground-fault protection for mixed-frequency loads — Type A catches pulsating DC fault currents that a plain AC type would miss.
Snaps onto standard DIN rail (REG mounting), takes up 2.5 width units — 36 mm wide — and sits 90 mm tall by 70 mm deep. Wire it with solid or stranded copper from 1.5 mm² up to 25 mm², torque the screw terminals to 2.5–3 N·m. The supply can land top or bottom, and the neutral comes in on the left side (N left variant).
Marked as current production in the Siemens lifecycle system — no phase-out notice or last-time-buy window. This order code is the active build, not a superseded variant.
The 30 mA trip threshold is standard for personnel protection. Overvoltage category III, so it's rated for fixed-installation downstream of the main panel.