What this MCCB delivers — and what the ratings mean for your panel
The Siemens SENTRON 3VA2216-7MN32-0BC0 is a 3-pole molded case circuit breaker (MCCB) rated for 160 A continuous current, built for motor protection duty. That 160 A holds flat from 40 °C up to 50 °C, then derates to 144 A at 70 °C — so in a warm enclosure you still get headroom for a full-load motor draw near the nameplate. The interrupting capacity is the headline: 330 kA at 240 V, 242 kA at 415 V, and still 52.5 kA at 690 V. Those numbers mean this breaker can sit at the main service entrance or a high-fault sub-distribution board where upstream transformer capacity is large — it clears a bolted fault without needing a current-limiting fuse ahead of it. The overcurrent release is an ETU350M — an electronic trip unit with phase failure detection, adjustable settings, and an undervoltage release (UVR) built in. The UVR means if control power drops, the breaker trips; that's standard for emergency-stop chains or undervoltage protection on motor feeders. Two auxiliary switches (HQ type) are integrated for status feedback to a PLC or indication panel.
Physical fit and panel integration
Dimensions: 105 mm wide, 181 mm tall, 86 mm deep. That 105 mm width is a standard 3-pole MCCB footprint — it fits the same DIN-rail or panel-mount cutout as other SENTRON 3VA2 frame sizes. The 86 mm depth includes the arc chamber and terminals; leave clearance for cable bending radius below the breaker. Rated insulation voltage is 800 V, so it's comfortable on 690 V systems without derating the insulation path.
Thermal management and power loss
Maximum power loss is 75 W at rated current. That's not trivial — in a sealed, high-density panel, account for that heat in the thermal budget. The operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The derating curve above 50 °C is gradual (losing about 6 A per 10 °C step), so you can still run it at 150 A in a 60 °C ambient without tripping on thermal memory.