What this MCCB is and what it does
The Siemens SENTRON 3VA2116-6HN32-0CA0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection — meaning it sits on the feeder side of a distribution panel, not on a motor branch. Rated continuous current Iu is 160 A, and it holds that rating flat from 40 °C up to 50 °C; above that it derates to 154 A at 55 °C and 136 A at 70 °C. That thermal curve matters if this breaker lives in a non-climate-controlled enclosure near a heat source. Breaking capacity is the headline number here: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and still 5 kA at 690 V. That 242 kA at 240 V tells you this is built for high-fault locations — transformer secondaries or large bus risers where the available fault current is extreme. The ETU350 electronic trip unit gives you adjustable long-time, short-time, and instantaneous pickup, plus ground-fault capability if you add the right accessory. Rated insulation voltage Ui is 800 V. Maximum power loss is 28 W.
Trip unit and auxiliary release
This order code ships with the ETU350 electronic overcurrent release and an undervoltage release (UVR) as a factory-installed auxiliary release. No auxiliary contacts are included on this variant.
Physical fit and environment
Dimensions: 181 mm high, 105 mm wide, 86 mm deep. That 105 mm width is a 3-pole frame; it mounts on a DIN rail or can be screw-mounted to a backplate. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C. The 86 mm depth includes the arc chamber and terminals — make sure your enclosure depth clears that plus wiring space behind the door.