What this MCCB is and what it does
The Siemens SENTRON 3VA2116-5HM42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 160 A continuous current, designed for line protection in distribution panels and industrial switchboards. It carries a 187 kA breaking capacity at 240 VAC, dropping to 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V — so on a 480 V system you have over 75 kA of fault-interruption headroom, which covers most industrial service-entrance and feeder applications without needing a current-limiting fuse upstream.
Key ratings and what they mean for fit
The 160 A continuous rating holds flat from 40 °C all the way up to 70 °C ambient — no derating curve to calculate for warm enclosures. That is unusual and useful: if this breaker lives in a hot panel near transformers or drives, you still get the full 160 A without stepping up to a larger frame. Rated insulation voltage is 800 V, which means the internal clearances and creepage distances are sized for 690 V systems with margin. The 4-pole construction lets you switch all three phases plus neutral, or use the fourth pole as a switched neutral in TN-S systems. Dimensions are 181 mm high, 140 mm wide, 86 mm deep — a compact footprint for a 160 A frame. Mounts on a standard DIN rail or panel-mount via the screw terminals. The 86 mm depth means it fits in shallow enclosures where taller breakers would hit the door. Power loss is 25.5 W maximum at rated current — useful for calculating heat rise in a sealed enclosure. The ground-fault monitoring version uses summation current formation on L + N conductor, which detects leakage without a separate GFCI module.