63 A MCCB with high-interrupt capacity for line protection
The Siemens SENTRON 3VA1163-5EF36-0BA0 is a 3-pole molded case circuit breaker rated for 63 A continuous current (Iu) in a line protection version, carrying a TM240 thermal-magnetic overcurrent release. Its interrupting capacity hits 187 kA at 240 V, 121 kA at 415 V, and 75.6 kA at 440 V — numbers that tell you this breaker handles serious fault current without upstream cascading. That 187 kA at 240 V means it can sit on the secondary side of a large transformer or on a high-capacity bus and still clear a bolted fault cleanly. The thermal derating curve is flat from 40 °C through 50 °C at the full 63 A, then drops to 60.48 A at 55 °C and 56.7 A at 70 °C. If your panel runs hot — say a packed enclosure near a furnace line — that 56.7 A at 70 °C is the number to size against, not the nameplate 63 A. The breaker includes an undervoltage release (UVR) as the auxiliary release design, but ships without auxiliary contacts or a ground fault monitoring module. The integrated auxiliary trip uses the 3VA9608-0BB11 accessory. No communication function, no phase failure detection — this is a straightforward thermal-magnetic line protection device, not a smart breaker.
Panel fit and environmental limits
The 3VA1163-5EF36-0BA0 measures 70 mm deep, 76.2 mm wide, and 130 mm tall. That 76.2 mm width is the standard 3-pole MCCB footprint — it'll drop into a panel cutout designed for a SENTRON 3VA frame without re-drilling the gland plate. Depth of 70 mm leaves room behind a 200 mm deep enclosure for wiring and the UVR coil. Front protection is IP40 — fine for a dry indoor panel, but keep it behind the enclosure door if there's washdown or dust. Operating range spans -25 °C to 70 °C, storage from -40 °C to 80 °C. The 800 V rated insulation voltage (Ui) covers 480/277 V and 600 V systems with headroom.