What it is — and what the ratings mean for fit
The Siemens SENTRON 3VA1116-5EF42-0HH0 is a 4-pole molded case circuit breaker (MCCB) designed for line protection — meaning it sits at the incoming feed to protect the distribution bus, not a specific motor or load. Rated 160 A continuous at 40 °C, it holds that rating flat through 50 °C, then derates gradually to 150 A at 70 °C. That thermal curve matters: in a sealed panel with no forced cooling, you can count on the full 160 A up to 50 °C — a real advantage in warm enclosures. Interrupting capacity is the headline here: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 500 V and 690 V. That means this breaker can safely clear a fault all the way up to 187 kA on a 240 V system without welding contacts or venting gas — critical for high-fault-capacity panels like those fed by a large transformer. The 4-pole design handles three-phase plus neutral, common in North American and European distribution where you need full isolation on all conductors.
Built-in auxiliary switches and shunt trip — no add-on modules needed
This variant ships with 2 auxiliary switches plus 1 trip alarm switch (HQ type) factory-fitted, and a shunt trip release (STL) as the auxiliary release. That means you get remote status indication (open/closed/tripped) and remote trip capability without buying separate accessory packs or wiring into the handle mechanism. For a panel builder, that saves a DIN-rail slot and the labor of snapping on external aux blocks.
Panel fit — dimensions and wiring
Footprint is 130 mm high, 101.6 mm wide, 70 mm deep — roughly 5.1 x 4 x 2.8 inches. That 70 mm depth is the breaker body, not including handle throw or rear terminals; plan for at least 90 mm clearance behind the panel door. Width at 101.6 mm means it takes a standard 4-inch mounting space on the DIN rail or backplate. Insulation voltage rated 800 V, so it's comfortable on 480/277 V and 600 V systems with margin.