The Siemens 5SJ6450-6 is a SENTRON 5SJ6 miniature circuit breaker with a B tripping characteristic, rated 50 A at 400 V AC across four poles. It provides 6 kA breaking capacity per both EN 60898 and IEC 60947-2, which means it safely clears faults up to that level on a 400 V distribution board without cascading upstream.
Occupies 4 width units (roughly 72 mm) on a DIN rail; installation depth is 70 mm. The terminals accept solid or stranded conductors from 0.75 mm² up to 25 mm², which covers standard panel wiring up to 4 AWG. Mounting position is unrestricted, so it can go sideways or inverted if the gland plate layout demands it.
Mechanical endurance and approvals
Rated for 20 000 mechanical switching cycles typical. Vibration resistance tested to 50 m/s² at 25-150 Hz and 60 m/s² at 10-150 Hz per IEC 60068-2-6. Overvoltage category 3, insulation voltage 440 V AC. The 5SJ6 series carries EN 60898 and IEC 60947-2 ratings, giving it acceptance across European and international distribution panels. Touch protection is built in on the terminals.