What this MCCB is and what the ratings mean
The Siemens SENTRON 3VA2116-5HN32-0DL0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection duty, carrying a continuous current Iu of 160 A. That 160 A holds flat from 40 °C through 50 °C — no derating needed in a warm panel — then steps down to 154 A at 55 °C, 148 A at 60 °C, 142 A at 65 °C, and 136 A at 70 °C. The interrupting capacity tells you where this breaker can clear a fault without welding or rupturing: 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 4.25 kA at 690 V. Those are high-interrupt ratings for a 160 A frame — it handles stiff utility feeds and transformer-secondaries where fault current runs heavy. The electronic trip unit is an ETU350, which gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves — not a fixed thermal-magnetic. That means you can coordinate it downstream of a feeder breaker and upstream of branch devices without guessing at the thermal memory. The rated insulation voltage is 800 V, so it's comfortable on 480/277 V and 600 V systems with margin. It includes an undervoltage release (UVR) as the auxiliary release design, plus a 2+1+1 auxiliary contact configuration: 2 auxiliary switches, 1 trip alarm switch, and 1 electrical alarm switch. That's enough for remote status and a separate shunt-trip signal back to the PLC or safety relay. Maximum power loss is 28 W — worth accounting for in a densely packed enclosure with multiple breakers.
Panel fit and mounting
Dimensions are 105 mm wide, 181 mm high, 86 mm deep. That 105 mm width is the standard 3-pole MCCB footprint for this frame size — it occupies three 35 mm DIN-rail modules worth of panel width if mounted on a DIN rail, or bolts directly into the enclosure backplate. The 86 mm depth leaves room behind a 200 mm deep enclosure for wiring and the UVR coil connections. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C. That covers unheated warehouses and outdoor cabinets in most climates. The latching endurance is rated at 20 000 operations — mechanical life, not electrical. For a line-protection breaker that may only cycle a few times a year under fault, that's effectively unlimited.