The Siemens 5SL3520-6 is a 2-pole (1P+N) miniature circuit breaker from the SENTRON 5SL series, rated 20 A with a B tripping characteristic and a 4.5 kA breaking capacity per EN 60898 and IEC 60947-2. It operates at 230 V AC single-phase, with a maximum DC rating of 60 V.
The 5SL3520-6 occupies 2 width units (36 mm) on a DIN rail, with a depth of 76 mm and an installation depth of 70 mm. Terminal capacity accepts solid or stranded conductors from 0.75 to 25 mm², with a tightening torque of 2.5 to 3 N·m. IP20 protection applies with conductors connected — standard for enclosed distribution boards. The neutral conductor is switched (1P+N), so it disconnects both line and neutral on overcurrent or fault.