Siemens SENTRON 3VA1163-5MH32-0HA0 — 63 A MCCB with Shunt Trip
The Siemens SENTRON 3VA1163-5MH32-0HA0 is a 3-pole molded case circuit breaker rated 63 A at 40 °C, with a breaking capacity of 187 kA at 240 V and 121 kA at 415 V. It carries a TM120M overcurrent release and a shunt trip (STL) auxiliary release, making it suitable for motor starter protection in industrial panels where remote trip capability is required. Rated insulation voltage is 800 V, and the breaker is designed for starter protection duty — meaning it coordinates with a contactor to clear short-circuit faults before the contactor welds. The shunt trip allows a remote signal (from an E-stop, PLC, or safety relay) to open the breaker independently of the overcurrent mechanism.
Breaking Capacity and Thermal Derating
The 3VA1163-5MH32-0HA0 delivers 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 7.5 kA at 500 V and 690 V. These are high-interrupting ratings for a 63 A frame — the 187 kA at 240 V covers high-fault industrial services where upstream transformers can deliver massive short-circuit current. Thermal derating is minimal up to 50 °C (full 63 A), then drops to 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at 70 °C. In a sealed panel with ambient near 60 °C, you lose only 2 A — the TM120M release holds its trip curve well. Maximum power loss is 17.3 W, which is modest for a 63 A MCCB — relevant for thermal budgeting inside a crowded enclosure.
Dimensions and Panel Fit
The breaker measures 70 mm deep, 76.2 mm wide, and 130 mm high. The 76.2 mm width (3 inches) is standard for a 3-pole SENTRON 3VA frame — it occupies three adjacent 25 mm DIN-rail positions or a dedicated mounting plate. Depth of 70 mm leaves clearance for rear-mounted busbars and wiring gutters in a 200 mm deep enclosure.