The Siemens 5SN6301-7CP is a 3-pole miniature circuit breaker from the SENTRON 5SN series, rated for 400 V AC at 50 Hz.
The 5SN6301-7CP occupies 3 modular width units (54 mm wide) on a DIN rail, with a depth of 76 mm and an installation depth of 70 mm. Height is 90 mm. Solid conductors up to 35 mm² can be terminated, which covers most downstream feeder and branch circuit wiring. The 76 mm depth means it sits flush with adjacent SENTRON devices in a standard distribution board — no extra enclosure depth needed.
Electrical ratings and thermal behaviour
Rated for multi-phase and single-phase operation up to 440 V AC maximum. DC rating tops out at 72 V. Power dissipation is 1.2 W per pole in hot operating state at rated current — three poles sum to 3.6 W, which is manageable in a sealed enclosure but worth checking against the panel's thermal budget in a high-density layout.