What this MCCB does on a motor branch
The Siemens SENTRON 3VA2216-7MN32-0AB0 is a 3-pole molded case circuit breaker rated for 160 A continuous current (Iu) at 40 °C, built specifically for motor protection — it includes phase failure detection and an ETU350M electronic overcurrent release that handles the inrush and overload profile of a motor start without nuisance tripping. Breaking capacity hits 330 kA at 240 V and 242 kA at 415 V, so it can interrupt a high-fault bolted short upstream without cascading to the main breaker — that is the kind of rating you spec when the transformer is right around the corner. Rated insulation voltage is 800 V, which covers 690 V line-to-line systems with margin; the front face carries IP40 protection, meaning it keeps tools and dust out of the mechanism in a closed panel.
Mounting and panel fit
Footprint is 105 mm wide by 181 mm tall by 86 mm deep — standard 3-pole MCCB envelope for a 160 A frame. It bolts to a mounting plate or backpanel; no DIN-rail clip on this class of breaker. Auxiliary contact version ships with 2 HP-rated auxiliary switches built in, so you get status feedback to the PLC without adding a separate contact block.