What this MCCB is and what it does
The Siemens 3VA1116-5ED32-0HH0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It's a 3-pole unit rated 160 A continuous at 40 °C, with an interrupting capacity of 187 kA at 240 V AC — that's the number that tells you it can clear a dead short without welding its contacts or rupturing the case. The 187 kA rating at 240 V means it's sized for high-fault locations like service entrances or industrial mains where available fault current is substantial.
Ratings that decide fit
Continuous current holds at 160 A from 40 °C through 50 °C, then derates to 150 A at 70 °C — so if your panel runs hot, you lose 10 A of headroom. Interrupting capacity drops as voltage climbs: 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 500 V or 690 V. That steep drop above 440 V means you need to verify the available fault current at your system voltage, not just the headline 187 kA number. Rated insulation voltage is 800 V, so the breaker's internal clearances and creepage are sized for 690 V systems with margin.
Panel fit and auxiliaries
Width is 76.2 mm (3 inches), depth 70 mm — standard MCCB footprint for a 160 A frame. It ships with a shunt trip (STL) release and a configuration of 2 auxiliary switches plus 1 trip alarm switch (HQ). The shunt trip lets you remotely trip the breaker from a safety circuit or emergency stop; the alarm switch signals a fault trip separately from the aux contacts, which follow the handle position. Power loss at rated current is 38 W — factor that into enclosure thermal rise if you're packing multiple breakers in a small panel.