160 A MCCB with ETU330 — what the ratings mean for your panel
The Siemens 3VA2216-6HM32-0AA0 is a SENTRON molded case circuit breaker rated for 160 A continuous current across the full 40 °C to 70 °C ambient range — no derating needed until you push past 70 °C. That 160 A holds steady at every 5 °C step from 40 up to 70 °C, so it handles warm enclosures without a second look at the thermal curve. Breaking capacity hits 242 kA at 240 V AC, dropping to 187 kA at 415 V and 440 V, then 121 kA at 500 V, and 4.5 kA at 690 V. That 242 kA at 240 V means it clears high-fault conditions on the secondary side of a step-down transformer or near a large service entrance — the kind of fault that would weld a lesser breaker shut. The ETU330 electronic trip unit gives adjustable I²t protection (the design of I-trip is adjustable), so you can shape the long-time and short-time pickup to match your feeder or motor branch circuit. No voltage trigger, no undervoltage release, no communication module — this is a straight line-protection breaker with ground-fault monitoring via summation current on the L-conductors.
Panel fit and mounting
Three-pole format, 105 mm wide, 181 mm tall, 86 mm deep. That 86 mm depth is the dimension that matters when you're sliding it into a shallow backpanel or a gland-plate clearance — it's shallower than many MCCBs in this current class, so it fits retrofit enclosures where the old breaker was a different footprint. IP40 on the front face keeps dust out of the trip unit adjustment compartment.