Siemens 3VA2216-5MN32-0HC0 — 160 A Motor Protection MCCB with ETU350M
It carries a phase failure detection function, so when one leg drops out on a three-phase motor, this breaker trips — that's the difference between a quick restart and a burned-up winding. The ETU350M electronic trip unit handles the overcurrent release, giving you adjustable thermal and magnetic curves that a fixed-trip breaker can't match. Interrupting capacity is the headline here: 187 kA at 240 V, 121 kA at both 415 V and 440 V, 75.6 kA at 500 V, and still 17 kA at 690 V. That's enough headroom for most industrial distribution panels, even those feeding large motor control centers where fault current runs high. The shunt trip (STL) auxiliary release is built in, and it ships with two HQ auxiliary switches for remote status feedback.
Thermal Derating and Duty Cycle
At 55 °C it derates to 153.6 A, at 60 °C to 150.4 A, at 65 °C to 147.2 A, and at 70 °C to 144 A. If your panel runs hot near a drive cabinet or a bank of contactors, you've got a clear derating curve to size against. Maximum power loss is 75 W, which matters for ventilation planning in a sealed enclosure.
The 105 mm width matches standard 3-pole MCCB mounting centers. Line and load lugs accept copper or aluminum conductors sized for 160 A. The ETU350M trip unit gives you adjustable settings for long-time pickup, short-time pickup, instantaneous pickup, and ground fault — all set via rotary dials on the front face, no software needed. The two HQ auxiliary switches (one normally open, one normally closed) are pre-wired to terminal blocks for easy integration into a PLC or motor control circuit. The shunt trip release (STL) allows remote tripping from an E-stop or safety relay.