The Siemens SENTRON 5SY3032-6 is a 1P+N miniature circuit breaker with a B tripping characteristic, rated 32 A at 230 V AC and a 4.5 kA breaking capacity per EN 60898. It switches the neutral conductor, which means a single-width module (18 mm) protects both the phase and the neutral in a single-pole-plus-neutral distribution board or sub-panel.
The energy limiting class 3 means it restricts the let-through energy (I²t) during a fault, which helps with downstream coordination and reduces arc-flash stress on the conductors. For a 32 A resistive load on a 230 V single-phase circuit — say a bank of infrared heaters or a large lighting contactor — this is the correct curve. If the load includes a transformer inrush or a small motor, step up to a C curve sibling. The neutral conductor switching function (1P+N) means the breaker opens both the phase and the neutral when it trips. This is required in some national wiring regulations for final subcircuits to ensure the load is fully isolated. The touch-protected terminals (IP2X) reduce the chance of accidental contact during panel work.
Single width unit (18 mm) on standard DIN rail. The tightening torque range is 17.7 to 22.1 lbf·in (2.0 to 2.5 N·m) for the screw terminals — use a torque screwdriver within that band; overtightening can distort the terminal body.