What this MCCB is and where it fits
The Siemens 3VA2116-8HL42-0AA0 is a SENTRON 3VA2 molded case circuit breaker (MCCB) rated for 160 A continuous current, configured as a 4-pole unit with an ETU320 electronic overcurrent release. It's designed for line protection in distribution panels and switchgear — the ETU320 gives you adjustable thermal and magnetic trip curves, not a fixed bimetal, so you can coordinate selectively with downstream breakers. Breaking capacity is 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V. That's a lot of fault-current headroom — this breaker can sit near a large transformer or generator bus and still interrupt a bolted fault without venting or welding contacts. The 86 mm depth, 140 mm width, and 181 mm height put it in a standard 3VA2 frame size. It's a panel-mount device, not a plug-in — you'll bolt it to a mounting plate and wire it through lugs or busbars. The IP40 front protection means it's fine inside a closed enclosure; keep it out of washdown zones.
What the ratings mean for your panel
The 160 A rating holds across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. That's useful if the breaker sits in a warm enclosure near transformers or other heat sources. Insulation voltage is rated 800 V, so the 690 V breaking capacity figure is within the insulation envelope. The ETU320 trip unit is electronic, not thermal-magnetic — it draws a small auxiliary power from the line side and gives you more precise long-time and short-time pickup adjustments for selective coordination. Power loss is 19.7 W maximum at rated load. That's moderate for a 160 A frame — account for it in your enclosure thermal calculation, but it won't drive a fan requirement on its own.