The Siemens 5SM3347-0KL is a SENTRON residual current operated circuit breaker (RCCB), 4-pole, type AC, rated 80 A at 400 V AC with a 30 mA trip threshold.
The 80 A rated current and 30 mA residual sensitivity define the part's role: it protects circuits and personnel against earth faults up to 80 A load current, tripping when leakage exceeds 30 mA. The 400 V AC rated supply voltage matches standard three-phase distribution in many regions. The 4-pole design with N left (neutral on the left side) and the 4 width units (modular spaces) dictate panel layout — verify busbar alignment and DIN-rail space before installation. The tightening torque range of 2.5 to 3 N·m for the screw terminals is standard for this conductor size class.
Deployment context
The IP20 rating means it is intended for use inside an enclosed panel — not for wet or outdoor locations without additional enclosure protection.