The Siemens 5SM1314-0FD is a Type AC residual current device (RCD) — an FI-Protector — rated for 40 A continuous current on a 2-pole 230 V circuit, with a 30 mA rated residual operating current. The 2-module (2TE) width fits standard DIN-rail enclosures.
The 40 A rating sizes this RCD for a 40 A final sub-circuit — typically feeding a group of socket outlets or a fixed load up to 9.2 kW at 230 V. The 30 mA sensitivity is the IEC 60364-4-41 threshold for supplementary protection against direct contact; it will trip on leakage currents above 30 mA, which is below the let-go threshold for adults. For circuits with variable-speed drives, LED drivers, or single-phase rectifiers, a Type A or Type F RCD would be required.
Integration notes
The 2TE (36 mm) width on a 55 mm deep housing fits standard DIN-rail distribution boards. The 2-pole configuration (L + N) is correct for single-phase 230 V circuits. Terminals accept copper conductors sized for the 40 A rating; verify the upstream overcurrent protective device is coordinated per the manufacturer's selectivity tables.