The Siemens SENTRON 5SM9322-6KK is a 2-pole residual current (RC) unit electronic, type A, rated 40 A with 30 mA sensitivity at 400 V AC, 50 Hz. Its instantaneous design means it trips without intentional delay on a ground fault — no time-grading curve to coordinate with downstream devices. The 0.8 W power dissipation per pole in hot operating state is the thermal load you need to budget for in a closed panel; at 2 poles that's 1.6 W total, negligible for most enclosures but worth checking if the cabinet is densely packed.
The 2-pole width occupies two modular units (36 mm). Rated for 400 V AC phase-to-phase or phase-to-neutral circuits at 50 Hz.