The Siemens 5SL4406-7CC is a SENTRON 5SL series miniature circuit breaker, 4-pole, rated 6 A at 400 V AC with a C tripping characteristic.
The C-curve (tripping characteristic class C) means the magnetic trip activates at 5 to 10 times rated current — 30 to 60 A for this 6 A breaker. Terminals accept solid or stranded conductors from 0.75 to 25 mm², with a tightening torque of 2.5 to 3 N·m. That range covers everything from 1.5 mm² lighting circuits up to 6 mm² feeder tails, so you won't need reducers or pigtails for mixed conductor sizes on the same breaker. The 4-pole body occupies 4 width units (72 mm) on a DIN rail, with a depth of 76 mm and an installation depth of 70 mm. Ambient temperature range is -25 to +55 °C, with 95% humidity max; storage range extends to -40 to +75 °C.