The Siemens 5SU1356-7KV06 is a combined residual current device and miniature circuit breaker — an RCBO — in a single 1+N-pole module with a Type A residual current characteristic, 30 mA sensitivity, 6 kA short-circuit breaking capacity, and a C-curve thermal-magnetic trip set at 6 A. The 30 mA trip threshold is the standard for personal protection against indirect contact in most IEC 60364 installations.
The 70 mm depth (D=70mm) fits most shallow enclosures, but check the gland-plate clearance if you're retrofitting into a crowded cabinet. The 1+N-pole format occupies a single module width and switches the line conductor only; the neutral is switched internally for isolation but is not protected against overload.