What this MCCB is and what it protects
The Siemens SENTRON 3VA2116-5HN32-0HA0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection — meaning it guards feeders and downstream distribution against overcurrent and short-circuit faults. It carries a rated continuous current Iu of 160 A and an interrupting capacity of 187 kA at 240 V AC, which drops to 121 kA at 415 V and 4.25 kA at 690 V. The electronic trip unit is an ETU350, providing adjustable overload and short-circuit protection curves. A shunt trip release (STL) is integrated for remote tripping via a control signal — useful for emergency-stop or supervisory shutdown circuits.
Panel integration and physical fit
The breaker measures 105 mm wide, 181 mm high, and 86 mm deep. It mounts on a DIN rail or can be screw-fixed to a backplate. The 86 mm depth is the dimension from the mounting plane to the front face — when planning gland-plate clearance or door clearance, that is the number to use. The 105 mm width means it occupies three 35 mm module spaces on a standard DIN rail, matching the 3-pole footprint.
Thermal derating and ambient limits
The 160 A rating holds up to 50 °C. Above that, derate linearly: 154 A at 55 °C, 148 A at 60 °C, 142 A at 65 °C, and 136 A at 70 °C. Operating ambient range is -25 °C to +70 °C. Storage range is -40 °C to +80 °C. Maximum power loss is 25.5 W — account for that heat in a sealed enclosure.