The Siemens 5SM3314-6BA is a 2-pole RCCB from the SENTRON 5SM3 family, rated at 40 A and 30 mA trip sensitivity, Type A, for 230 V AC 50 Hz systems.
Rated current 40 A and short-circuit current rating 10 kA at 230 V AC. Terminals accept solid or stranded conductors from 1 to 16 mm², with a tightening torque of 2.5 to 3 N·m. That -25 °C low end matters if the panel sits in an unheated enclosure in a northern winter; the 45 °C upper bound is the standard derating ceiling for switchgear in a ventilated enclosure. Mounting position is unrestricted — horizontal, vertical, upside-down — the electromechanical mechanism doesn't care. IP20 with connected conductors and the distribution board installed. Overvoltage category III, rated for fixed-installation downstream of the utility meter. Surge current resistance is 1 kA.
DIN rail mount, 70 mm installation depth. That depth matches the standard SENTRON MCB/RCCB family, so it aligns with the busbar and enclosure backplane in a typical distribution board. The 2-module width (36 mm) is the standard for a 2-pole RCCB — no oddball footprint.