What this 160 A MCCB does on the line
The Siemens SENTRON 3VA1116-5EF42-0AC0 is a 4-pole molded case circuit breaker rated 160 A at 40 °C, built for line protection in distribution panels and motor control centers. Its TM240 thermal-magnetic release handles overloads and short-circuits without external trip units, keeping the BOM simple. Breaking capacity hits 187 kA at 240 V and 121 kA at 415 V — enough for high-fault utility feeds where a standard MCCB would weld shut.
Breaking capacity and thermal derating — the real numbers
At 440 V the interrupting rating drops to 75.6 kA, and at 500 V or 690 V it holds at 17 kA. That 17 kA at 690 V is the weak point — if your secondary side runs 690 V with fault current above that, this breaker is not the right pick. Thermal derating is mild: 160 A holds flat from 40 °C to 50 °C, then steps down to 150 A at 70 °C. No surprise trip on a hot summer day in a non-climate-controlled enclosure.
Panel fit and auxiliary wiring
Footprint is 101.6 mm wide by 130 mm tall by 70 mm deep — 4 inches wide, which is standard for a 160 A frame. Ships with two HQ auxiliary switches pre-installed, so you get status feedback without ordering a separate accessory kit. Insulation voltage rated 800 V, so it can sit on a 690 V bus without derating the dielectric. Max power loss is 38 W; factor that into enclosure ventilation if you're stacking several in a row.