Siemens 5SN6406-7CP — 4-pole MCB for 400 V AC distribution
The Siemens 5SN6406-7CP is a 4-pole miniature circuit breaker from the SENTRON 5SN series, rated for 400 V AC at 50 Hz and a 6 kA breaking capacity per EN 60898, with a higher 30 kA rating per IEC 60947-2 for industrial fault-current duty. The dual breaking-capacity rating means the 5SN6406-7CP is listed for both residential/infrastructure panels (6 kA per EN 60898) and industrial switchgear (30 kA per IEC 60947-2), giving the specifying engineer headroom for high-fault locations without changing the breaker footprint.
DC-side rating goes to 72 V maximum — useful for control-circuit tapping off the same bus, but the primary duty is AC distribution. Terminals accept solid conductors up to 35 mm², covering most feeder and branch-circuit wire sizes in a 400 V panel.
The 76 mm overall depth includes the front projection. Standard SENTRON accessory footprint — auxiliary switches, shunt trips, and under-voltage releases from the 5ST3 series clip onto the right side without increasing the width.