63 A line protection with serious interrupting capacity
The Siemens SENTRON 3VA1163-5EF32-0HA0 is a 3-pole molded case circuit breaker rated for 63 A continuous current at 40 °C, with a TM240 thermal-magnetic overcurrent release. Its interrupting ratings climb to 187 kA at 240 V and 121 kA at 415 V — numbers that put it squarely in high-fault-current distribution work, not branch-circuit light duty. The 800 V rated insulation voltage (Ui) tells you this breaker is built for 480Y/277 V and 600 V industrial panels with headroom to spare. The shunt trip (STL) auxiliary release (order code 3VA9688-0BL30) is integrated, so remote tripping for emergency-stop or supervisory control is wired in from the factory — no field-add kit needed. At 76.2 mm wide and 130 mm tall, this breaker fits the standard SENTRON 3VA panel footprint. Depth is 70 mm. No auxiliary contacts, no communication module, no ground-fault monitoring — this is a clean line-protection MCCB with a single job: thermal-magnetic overload and short-circuit interruption. The IP40 front protection means it's fine in a closed panel; keep it out of washdown zones.
Current rating holds flat through 50 °C
The 63 A rating is continuous at 40 °C, 45 °C, and 50 °C — no derating needed in a normally ventilated panel. At 55 °C it drops to 60.48 A, and it steps down gradually to 56.7 A at 70 °C. For a panel builder stuffing a 63 A feeder into a 50 °C enclosure, that flat curve means you don't oversize the breaker for ambient heat. The latching endurance of 15,000 operations covers the mechanical life; the electrical endurance depends on the switching duty, but for a line-protection breaker that sees infrequent fault interruption, that's plenty.