MCCB for line protection — 100 A frame, ETU350 trip unit
The Siemens SENTRON 3VA2010-6HN32-0AA0 is a 3-pole molded case circuit breaker rated at 100 A continuous current (Iu) across the full ambient range from 40 °C to 70 °C, meaning no derating is needed for elevated panel temperatures up to that ceiling. It carries a line protection designation — the ETU350 electronic overcurrent release is configured for feeder and distribution duty, not motor branch circuit protection. The interrupting ratings are substantial: 242 kA at 240 V AC, 187 kA at 415 V and 440 V AC, and 121 kA at 500 V AC, dropping to 3 kA at 690 V AC. That 242 kA figure at 240 V makes this a high-interrupting-capacity MCCB suitable for high-fault service-entrance or large distribution panel applications where available fault current is significant.
Panel fit — dimensions and mounting
The 3VA2010-6HN32-0AA0 measures 105 mm wide, 181 mm high, and 86 mm deep. The 105 mm width is a standard 3-pole MCCB footprint for the SENTRON 3VA platform, so it fits existing 3VA panel cutouts and busbar layouts without adapter plates. The 86 mm depth includes the arc chamber and rear terminals — verify gland plate clearance if the panel is shallow. Front IP40 protection means the breaker face is protected against tools and solid objects over 1 mm, but the enclosure itself must provide the overall IP rating for the panel.
Key ratings and what they mean for the buyer
The ETU350 electronic trip unit provides adjustable overload and short-circuit protection with a wider range of curve shaping than thermal-magnetic releases — useful for coordinating with downstream breakers in a selective coordination study. The 100 A rating is flat from 40 °C to 70 °C, so no ambient derating factor is needed in a warm panel. Rated insulation voltage is 800 V, and the maximum operating voltage is 690 V AC. Power loss is 13.5 W maximum — a modest heat contribution to the panel thermal budget. The breaker has no undervoltage release, no voltage trigger, no communication function, and no ground-fault monitoring version, so it is a basic line-protection device without add-on modules.