Siemens 3VA1163-6EF36-0JA0 — 63 A MCCB for high-fault panels
The Siemens 3VA1163-6EF36-0JA0 is a SENTRON molded case circuit breaker (MCCB) rated for 63 A continuous current in a 3-pole line protection configuration. Its TM240 thermal-magnetic release provides overload and short-circuit protection without electronic adjustments — a fixed-trip design that eliminates setting drift over temperature. The breaker carries a 220 kA interrupting rating at 240 V, dropping to 154 kA at 415 V and 121 kA at 440 V, which puts it in the high-breaking-capacity class for main feeders or large secondary distribution where fault currents are severe.
What the ratings mean for your panel
The 63 A rating holds across ambient temperatures up to 50 °C (–); above that it derates linearly to 56.7 A at 70 °C. That thermal profile matters for enclosures with poor airflow — if the panel ambient runs at 55 °C, the breaker's usable current drops to 60.48 A, so the load must be sized accordingly. The 220 kA at 240 V is the SCCR (short-circuit current rating) the breaker can safely interrupt without welding contacts or venting arc gas — critical for coordination studies on 480 V / 277 V services where the available fault current can exceed 100 kA. Rated insulation voltage is 800 V, so the breaker can be applied on 690 V systems (where its breaking capacity is 17 kA,) without derating the insulation.
Panel fit and wiring
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep. The 76.2 mm width is a standard 3-pole MCCB footprint — it occupies three 25.4 mm module positions on a DIN rail, so a panel designed for a typical 63 A frame will accept this without re-drilling the mounting plate. Operating temperature range is -25 °C to +70 °C; storage range is -40 °C to +80 °C. Mechanical endurance is rated at 15,000 operations. Reference code per DIN EN 81346-2 is Q.