The 5SM3314-0LB: The 40 A rating and 30 mA trip define the load it can carry and the leakage it will clear. The 2-pole design switches both line and neutral on a single-phase circuit. The 10,000 mechanical switching cycles is typical for this class; it's a protection device, not a daily-operating contactor.
Panel integration
Snaps onto DIN rail and occupies 2 width units at 36 mm wide. Depth is 70 mm — matches the standard 70 mm installation depth for SENTRON modular devices, so it sits flush with adjacent MCBs and RCBOs in the same row. Mounting position is any, which helps when panel layout is tight.