The 4-pole construction covers three-phase-plus-neutral, so it's the right choice for TN-S or TN-C-S systems where the neutral needs overcurrent protection. Breaking capacity steps down with voltage: 154 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V. For a 480 V panel with 65 kA available, this breaker fits only if the line side is impedance-limited or current-limited by an upstream device.
Thermal derating and ambient range
Above that, current must be reduced: 194 A at 55 °C, 188 A at 60 °C, 182 A at 65 °C, and 176 A at 70 °C. In a hot switchroom or outdoor enclosure in direct sun, the 70 °C operating limit is the absolute ceiling — the breaker will still function but at 176 A continuous.
Built-in accessories and wiring
The base switch mechanism is order code 3VA12206EF420AA0, meaning the trip unit, frame, and internal parts are a matched assembly — not a field-upgrade kit. The 140 mm width is the standard 4-pole SENTRON 3VA12 frame footprint — it occupies four 35 mm DIN-rail modules (each 17.5 mm plus spacing). Panel cutout and busbar spacing must accommodate the 158 mm height; verify clearance above for arc-chamber venting per Siemens installation instructions.