63 A MCCB with 187 kA interrupting capacity at 240 V
The Siemens SENTRON 3VA2163-5HN36-0HL0 is a 3-pole molded case circuit breaker rated for 63 A continuous current at 40 °C, with a 187 kA interrupting capacity at 240 V and 121 kA at 415 V. That interrupting rating means it can clear a bolted fault at the main distribution board without upstream fuses needing to coordinate — it's sized for high-fault service entrance or large subfeed applications where available fault current is substantial. The ETU350 electronic trip unit provides adjustable long-time, short-time, and instantaneous protection curves, plus ground-fault alarm capability (though this unit ships without ground-fault monitoring). The shunt trip (STL) allows remote tripping from a PLC or emergency-stop circuit, and the auxiliary contact block includes 2 auxiliary switches, 1 trip alarm switch, and 1 electrical alarm switch with HQ rating for status feedback to a control system.
Panel fit and mounting dimensions
The 3VA2163-5HN36-0HL0 measures 105 mm wide, 181 mm high, and 86 mm deep. That 105 mm width is a standard 3-pole MCCB footprint — it occupies the same panel cutout as other 3VA frame-size breakers, so swapping from a different 3VA variant or an older 3VL series should not require re-drilling the mounting plate. The 86 mm depth leaves clearance behind a standard 200 mm deep enclosure backpan.
Thermal derating and ambient limits
Rated 63 A up to 50 °C ambient. Above that, the continuous current derates linearly to 53.55 A at 70 °C. If the breaker lives in a hot switchroom or near a transformer, use the 55 °C column (60.6 A) for sizing. Operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Maximum power loss is 4 W per pole — negligible for enclosure thermal rise calculations.