What this MCCB is and what it does
The Siemens SENTRON 3VA2110-6HL42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 100 A continuous current, built around the ETU320 electronic trip unit. It's designed for line protection in distribution panels and motor control centers, where you need adjustable overload and short-circuit protection with high interrupting capacity. The ETU320 trip unit gives you adjustable thermal and magnetic settings, so you can coordinate selectivity downstream without swapping hardware. The 100 A rating holds flat across the full ambient range from 40 °C to 70 °C — no derating curve to chase in a warm enclosure. Breaking capacity is the headline: 242 kA at 240 V, 187 kA at 415 V and 440 V, still 121 kA at 500 V. At 690 V it drops to 3.7 kA — that's the limit for high-voltage low-current faults, not your typical distribution level. For most 400 V industrial services, 187 kA SCCR means it can sit upstream of a transformer or a large motor starter without worrying about cascading failure.
Dimensions and panel fit
The 3VA2110-6HL42-0AA0 measures 181 mm tall, 140 mm wide, and 86 mm deep. That's a 4-pole frame in a standard SENTRON 3VA footprint — it bolts into the same mounting pattern as other 3VA breakers in this current class. The IP40 front protection means it's fine for a clean indoor panel; no washdown rating, so keep it out of wet zones.
What the ETU320 trip unit gives you
The ETU320 is an electronic trip unit with adjustable overload (Ir) and short-circuit (Isd) pickups, plus a fixed instantaneous (Ii) for high faults. It's not a communicating unit — no Modbus, no PROFIBUS, no remote signaling — but it does have a trip indicator (mechanical flag) so you can see which breaker opened without opening the panel door. The 800 V rated insulation voltage covers most 400 V and 480 V systems with margin.