What this MCCB is and what it does
The Siemens 3VA1163-6EF32-0BC0 is a 3-pole SENTRON molded case circuit breaker (MCCB) rated for line protection — meaning it sits on the incoming feeder or a main distribution branch, not on a motor circuit with its own overload relay. The TM240 overcurrent release gives it a fixed thermal-magnetic curve tuned for 63 A continuous duty at 40 °C through 50 °C, with a slight derating ladder above that: 60.48 A at 55 °C, 59.22 A at 60 °C, 57.96 A at 65 °C, and 56.7 A at 70 °C. That derating profile matters if this breaker lives in a non-ventilated enclosure or next to heat-generating gear — the 63 A nameplate rating only holds up to 50 °C ambient. The interrupting capacity is what sets this variant apart: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and still 17 kA at 690 V. Those numbers mean it can safely clear a fault on a high-capacity transformer secondary or a large UPS-backed bus without needing a current-limiting fuse upstream. The 800 V rated insulation voltage (Ui) confirms it is rated for 690 V line-to-line systems.
Panel fit and integration
The 3VA1163-6EF32-0BC0 measures 130 mm high, 76.2 mm wide, and 70 mm deep. That 70 mm depth is the dimension that matters when you are fitting it into a shallow wall-mount enclosure or a gland-plate clearance zone — it is the projection behind the panel face. The 76.2 mm width (three 25.4 mm pole pitches) matches the standard 3-pole MCCB footprint on a DIN rail or mounting plate. IP40 on the front means it is protected against tools and wires >1 mm but not against water ingress; keep it inside a panel, not on an exposed wall. It ships with an undervoltage release (UVR) and 2 auxiliary switches (HQ design). The UVR trips the breaker when control voltage drops below a threshold — standard for machinery where a loss of control power must drop the main disconnect. The two auxiliary switches give you a normally-open and normally-closed contact for status feedback to a PLC or a panel lamp. The integrated auxiliary trip is order code 3VA9608-0BB11 if you need a spare or replacement module.