The Siemens 5SM1344-6BA is a Type A residual-current device (FI protector) rated 40A, 4-pole, with a 30mA trip sensitivity at 400V. The 4TE width and 55mm depth fit standard DIN-rail enclosures for panel integration. The Type A designation means it detects pulsating DC fault currents superimposed on AC — common in modern loads with rectifiers or switching power supplies. Rated for 400V line-to-line, this unit covers three-phase plus neutral applications. The 30mA sensitivity is the standard for personnel protection (shock risk) per IEC 60364. At 40A it handles distribution subfeeds and larger final circuits.
Siemens 5SM1344-6BA FI Protector Type A, 40A 4P 30mA 400V
MPN5SM1344-6BA
Siemens 5SM1344-6BA FI Protector Type A (PSE/SSF), D=55mm, 40A 4-pole, IΔn 30mA, 400V, 4TE.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
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Frequently asked questions
What are the key ratings for the 5SM1344-6BA?
40A rated current, 4-pole, 30mA residual sensitivity (IΔn), Type A waveform detection, rated voltage 400V, 4TE width, 55mm depth.
MPN
5SM1344-6BA