What this MCCB carries and where it fits
The Siemens SENTRON 3VA2116-5KP32-0KA0 is a 3-pole molded case circuit breaker rated for 160 A continuous current at 40 °C, built around the ETU850 electronic trip unit. It's a line-protection version — meaning the trip curve and coordination are set for feeder and main-switch duty, not motor-starting profiles. The interrupting ratings climb to 187 kA at 240 V and still hold 121 kA at 415 V, so it handles high-fault-current panelboards without cascading upstream breakers. Rated insulation voltage is 800 V, and the breaker carries a shunt trip (STL) auxiliary release as standard — that's the integrated trip coil for remote or emergency-stop shedding. Communication function is present on this variant, so it can talk to a higher-level controller for power monitoring or load-shedding commands. No undervoltage release, no ground-fault monitoring module, and no auxiliary contacts are included from the factory.
Thermal derating and panel integration
The breaker holds its full 160 A rating from 40 °C up through 50 °C. At 55 °C it derates to 154 A, at 60 °C to 148 A, and at 70 °C — the maximum operating ambient — it's still rated 136 A. That's a shallow derate curve; you don't lose much headroom in a warm enclosure. Mounting dimensions are 105 mm wide by 181 mm tall by 86 mm deep — standard SENTRON 3VA footprint for a 160 A frame. The 86 mm depth means it fits flush in most 200 mm deep enclosures without forcing a deeper gland plate. Maximum power dissipation is 25.5 W at rated load — that's the heat you need to vent from the panel. For a 160 A frame that's moderate; plan for natural convection or a small fan if the enclosure is tightly packed.