SENTRON 3VA2110-5HL32-0AF0 — 100 A MCCB with ETU320 trip unit
The Siemens SENTRON 3VA2110-5HL32-0AF0 is a 3-pole molded case circuit breaker (MCCB) rated for 100 A continuous current, fitted with an ETU320 electronic trip unit for line protection. Its interrupting capacity hits 187 kA at 240 V and 121 kA at 415 V, which puts it in the high-breaking-capacity tier — useful for large transformer secondaries or bus-tie applications where fault current is stiff. The 86 mm depth and 105 mm width match the standard 3VA2 panel footprint, so it swaps into an existing SENTRON lineup without re-drilling the mounting plate.
At 440 V it still holds 121 kA, dropping to 79 kA at 500 V and 4.25 kA at 690 V — the low 690 V figure tells you this is a 480 V-class breaker, not a 690 V main. Full 100 A rating holds up to 50 °C ambient; above that it derates linearly to 85 A at 70 °C. If your panel runs hot, that 85 A ceiling at 70 °C is the number to coordinate with, not the nameplate 100 A. The ETU320 trip unit is electronic, so it gives better long-time and short-time pickup accuracy than a thermal-magnetic — important for selective coordination downstream.
The 105 mm width is the same as the 3VA1 and 3VA2 frames, so it lines up with busbar bridges and phase barriers from the same family. Rated insulation voltage is 800 V, which covers 480 V and 600 V class systems with margin. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Power loss maxes out at 10 W — negligible for panel thermal budgeting.