What it is and what it does
The Siemens 3VA1116-3GE42-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 160 A continuous at 40 °C, with four poles and a TM220 thermal-magnetic overcurrent release. That 160 A rating holds steady up to 50 °C (–), then derates to 150 A at 70 °C — useful to know if this lands in a hot panel or next to other heat sources. The interrupting capacity hits 75.6 kA at 240 V and 52.5 kA at 415 V, so it handles substantial fault currents on industrial distribution without needing an upstream current-limiting fuse.
Fit and panel integration
Footprint is 101.6 mm wide by 130 mm tall by 70 mm deep (–). The 4-pole body takes up roughly 4 inches of DIN-rail width — check your enclosure fill factor if you're swapping into an existing panel. IP40 on the front means it's protected against tools and wires over 1 mm, but not against water ingress; keep it inside a rated enclosure. The N-conductor is protected at 100%, so this breaker handles full-phase neutral current without derating the neutral pole.