What it is and what it does
The Siemens SENTRON 3VA2063-6HL32-0HL0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current at 40 °C, with an ETU320 electronic overcurrent release and a built-in shunt trip (STL). It's a line-protection device — meaning it sits on the feeder or main branch of a panel, not on a motor or specific load. The interrupting capacity is the headline: 242 kA at 240 V, 187 kA at 415/440 V, 121 kA at 500 V, and 4 kA at 690 V. That's a lot of fault-clearing muscle for a 63 A frame. The auxiliary contact configuration is 2 auxiliary switches plus 1 trip alarm switch plus 1 electrical alarm switch (HQ designation). The shunt trip (STL) allows remote tripping — useful for emergency-stop circuits or supervisory control. No undervoltage release, no phase-failure detection, no communication function on this variant.
Panel fit and dimensions
Physical envelope: 181 mm high, 105 mm wide, 86 mm deep. That's a standard SENTRON 3VA2 frame size — mounts on a DIN rail or direct panel. The 105 mm width is three pole spaces on a standard 35 mm DIN rail. No surprises for a panel builder swapping out an older 3VA1 or competitive frame; the footprint is the same as other 3VA2 breakers in the series.
Thermal performance and derating
Rated continuous current holds at 63 A from 40 °C up to 50 °C — no derating needed in most standard panel environments. At 55 °C it drops to 60.6 A, at 60 °C to 58.3 A, at 65 °C to 55.9 A, and at 70 °C to 53.6 A. If your panel runs hot (say, near a furnace line or in a sealed enclosure), factor that curve in. Operating range is -25 °C to 70 °C; storage from -40 °C to 80 °C.
What's inside: auxiliary trip and switch modules
The supplied basic switch is order code 3VA2063-6HL32-0AA0. The integrated auxiliary trip is 3VA9688-0BL30. These are factory-fitted — not field-installable kits. If you need a different auxiliary contact count or a different trip unit, you're looking at a different order code, not a field mod.