Breaking capacity and trip unit — what they mean for your panel
The 3VA1332-6EF32-0AA0-ZD00 is a 3-pole IEC frame 400 circuit breaker with class H breaking capacity — 70 kA at 415 V. That rating means it can safely interrupt a fault current up to 70,000 A without rupturing or cascading the fault upstream. In a petrochemical plant or large industrial switchboard, that headroom lets you coordinate downstream feeders without oversizing the main breaker. The TM240 thermal-magnetic trip unit provides adjustable overload protection: Ir from 224 A to 320 A, set via a dial on the front. The short-circuit magnetic pickup Ii is fixed at 5 to 10 times In (320 A), so it clears hard faults fast — typically under 10 ms. For a 320 A continuous load on a 400 V distribution bus, this breaker is sized right for the main feeder or a large motor control center.
Where it fits — panel and system integration
This breaker mounts on a standard DIN rail or into a fixed-mounted switchboard chassis — the IEC frame 400 footprint matches the common Siemens 3VA1 panel cutout. The nut keeper kit for DC Power OEM in China is included, so it ships ready for bolted busbar connections in a DC distribution section. For an OEM building a 400 VAC or 250 VDC switchboard, the 3-pole form factor fits a 3-phase feeder or a two-pole DC circuit with the third pole unused.