The Siemens 3VA1120-6EE32-0AA0-ZD00 is a 3-pole molded case circuit breaker from the 3VA1 series, built on an IEC frame 160 platform. It carries a breaking capacity class H rating, meaning it can interrupt fault currents up to 70 kA at 415 VAC per IEC 60947-2 — the standard that governs low-voltage switchgear and controlgear. That 70 kA figure is the ultimate short-circuit breaking capacity (Icu), so the breaker safely clears a fault at that level without welding its contacts or rupturing the arc chamber. The thermal-magnetic trip unit is a TM220, set for line protection (ATFM). The continuous current rating (In) is 20 A, with an adjustable overload protection range (Ir) from 14 A to 20 A. Short-circuit protection (Ii) is fixed at 16 times In — 320 A magnetic pickup. This is a fixed-trip configuration; the overload band is the only field-adjustable parameter.
Deployment Context
This breaker mounts on a DIN rail or panel plate inside a distribution or motor control center. The suffix ZD00 indicates a nut keeper kit included for DC Power OEM applications in China — a packaging variant, not a functional change. The 3VA1 frame is a standard IEC form factor, so it fits alongside other 160 A frame accessories (auxiliary contacts, shunt trips, undervoltage releases) from the same series.