What this 3VA2 breaker brings to the panel
The Siemens 3VA2216-5HN32-0AH0 is a 3-pole IEC molded-case circuit breaker on the 250 A frame, fitted with an ETU350 LSI electronic trip unit. It is rated for line protection with a 55 kA interrupting capacity at 415 V (breaking capacity class M), which means it can safely clear fault currents up to that level in a 415 VAC system without the arc flashing over to adjacent equipment. This SCCR headroom is what lets you coordinate it downstream of a higher-rated main breaker and still meet the short-circuit rating required by IEC 60947-2. The continuous current rating (In) is 160 A, with the overload protection (Ir) adjustable from 63 A to 160 A. Short-circuit protection (Isd) is set between 1.5 and 10 times Ir, and the instantaneous pickup (Ii) is fixed at 12 times In. That LSI curve — long-time, short-time, instantaneous — gives the selectivity needed to coordinate with downstream branch breakers and avoid nuisance tripping on motor-start inrush or transformer energization. Two auxiliary switches (changeover H) and one trip alarm switch (changeover) are factory-fitted, so you get remote status indication and a separate alarm contact for fault annunciation without adding accessory modules. The nut keeper kit is included, which simplifies panel mounting on a DIN rail or backplate.
Deployment context: where this breaker fits
This MCCB is sized for a 160 A feeder or large motor branch in a 415 V industrial panel. The 55 kA breaking capacity at 415 V is typical for secondary distribution in a facility with a medium-voltage transformer — it handles the available fault current without needing a current-limiting upstream device. The 3-pole format suits three-phase loads: pumps, compressors, conveyors, or a distribution sub-panel. The ETU350's LSI curve lets you set short-time delay for selectivity with downstream breakers, which is critical in a multi-level distribution scheme.