The Siemens 5SL4140-8 is a SENTRON 5SL4-series miniature circuit breaker (MCB) designed for overcurrent and short-circuit protection in residential and infrastructure installations.
What the D-curve and ratings mean for fit
For a 1-pole breaker on a 400 V AC line, the single pole switches the phase; the neutral is not switched (neutral conductor switching: No). The maximum operating voltage for multi-phase operation is 440 V AC, so the breaker can be used on 400/440 V systems without derating the voltage side.
The screw terminals accept solid or stranded conductors from 0.75 to 25 mm²; the tightening torque range is 2.5 to 3 N·m.
Storage temperature extends from -40 to +75 °C. The overvoltage category is 3, and the energy limiting class is 3. The product is classified per DIN EN 61346-2 and DIN EN 81346-2 as function F (protection).