The 5SM3344-6BA: The 40 A rated current and 30 mA residual trip are the two numbers that decide the application: 40 A covers the main feed for a sub-distribution board or a heavy single load (e.g., a large pump or compressor), while 30 mA provides personal protection against direct contact — the standard threshold for socket-outlet circuits in most IEC-based codes. The Type A designation means it detects pulsating DC fault currents on top of sinusoidal AC, which is mandatory for circuits with single-phase rectifiers, variable-speed drives, or LED drivers that can generate smooth DC leakage.
Integration notes
Installation depth is 70 mm.