The Siemens 5SM2635-6 is a SENTRON RCD-unit — a 3-pole residual current device rated 63 A at AC with a 300 mA Type A trip. It operates at 50 Hz and carries an insulation voltage (Ui) of 460 V. The 300 mA sensitivity means it's sized for whole-circuit earth-leakage protection rather than individual equipment; Type A handles pulsating DC fault currents that a plain AC type would miss.
Thermal derating and panel fit
At 40 °C the unit carries 58.6 A; at 55 °C it's 54.81 A; at 70 °C it drops to 50.4 A. If the panel ambient runs hot, the 63 A label doesn't hold — size the upstream breaker to the derated figure. The body is 3 modular-width units wide (107 mm), 70 mm deep, 90 mm tall, and mounts in any position. IP20 only when the distribution board is installed with connected conductors — not a standalone open-panel part.
Approvals and compliance
Rated for overvoltage category III, pollution degree 2, and carries a surge voltage resistance of 4 000 V. Surge current resistance is 1 kA. The reference code per IEC 81346-2 is F. No UL, CSA, or CE marks are listed in the spec record — verify local acceptance before specifying into a UL 508A panel.