The Siemens SENTRON 3VA2110-5HN32-0JA0 is a 3-pole molded case circuit breaker rated for 100 A continuous current and an interrupting capacity of 187 kA at 240 V AC. That interrupting figure drops to 121 kA at 415 V and 440 V, then to 79 kA at 500 V, and 4.25 kA at 690 V — so the voltage class of your distribution panel dictates the available fault current this breaker can safely clear. The ETU350 electronic trip unit gives you adjustable long-time, short-time, and instantaneous protection curves, which matters when coordinating downstream feeders on a motor control center or a lighting panel.
Thermal derating and panel fit
Rated 100 A from 40 °C to 50 °C ambient; above that the continuous current derates — 96.25 A at 55 °C, 92.5 A at 60 °C, 88.75 A at 65 °C, and 85 A at 70 °C. If the panel ambient runs hot, size the breaker for the actual temperature, not the nameplate. Dimensions are 181 mm high, 105 mm wide, 86 mm deep — standard SENTRON 3VA footprint, so it drops into existing DIN-rail or screw-mount panels without re-drilling. Maximum power loss is 10 W, which matters for thermal budgeting inside a sealed enclosure.
Trip unit and auxiliary options
The ETU350 electronic trip unit is the brains — it provides LSI protection (long-time, short-time, instantaneous) with adjustable pickups and time delays, which is what you need for selective coordination on a distribution board. The breaker ships with a shunt trip (STL) for remote opening; there is no undervoltage release, no auxiliary contacts, no ground-fault monitoring, and no communication module. If you need those, the basic switch (3VA2110-5HN32-0AA0) and the integrated auxiliary trip (3VA9688-0BL32) are the building blocks to add them. Mechanical endurance is rated at 20,000 operations — typical for a 100 A frame in panelboard duty.