What you're looking at
The Siemens 3VA2163-5KQ46-0AA0 is a SENTRON molded case circuit breaker — 4-pole, 63 A continuous rating that holds flat from 40 °C all the way to 70 °C, so no derating headache in a warm panel. Breaking capacity hits 187 kA at 240 V and still clears 121 kA at 415 V and 440 V. That's serious fault-interruption muscle for a 63 A frame.
The ETU860 release and what it means for selectivity
This breaker ships with the ETU860 electronic overcurrent release — that's the programmable one, not a fixed thermal-magnetic. You get adjustable long-time pickup and delay (tr from 0.5 to 25 s), short-time, instantaneous, and ground-fault protection via summation of L+N conductors. The N-conductor protection is adjustable OFF or from 40 % to 160 %. For a site electrical engineer building a selective coordination study, the ETU860 gives you the curve-shaping headroom to stay coordinated downstream without oversizing the main.
Panel fit — dimensions and mounting
Footprint is 140 mm wide × 181 mm tall × 86 mm deep. That 86 mm depth is the key number for a shallow enclosure or a gland-plate clearance check — it's the dimension that bites you if you're swapping into a tight retrofit can. IP40 on the front face means it's splash-resistant from the operator side but not sealed for washdown; keep it inside the panel or behind a door.