FI/LS protector for a single-phase final circuit
The Siemens 5SU1654-6KV32 is a combined residual-current and miniature circuit breaker (RCBO) — one unit does what used to take two DIN-rail modules. It protects a 1+N-pole final circuit at 32 A, B-curve, with a 300 mA Type A residual-current trip. The 10 kA breaking capacity handles domestic and light commercial fault levels. Type A detection means it catches pulsating DC fault currents from electronics or rectified loads — not just sinusoidal AC leakage. At 70 mm wide (4 module spaces) it fits a standard distribution board.