The Siemens SENTRON 3VA2440-6HN32-0AD0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuously across the full 40 °C to 70 °C ambient range — no derating needed up to that ceiling. It is a line-protection device (not a motor-protection or ground-fault variant), designed to sit in a main feeder or large subfeed position in a 3-phase distribution panel. Breaking capacity is voltage-dependent: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 9 kA at 690 V. That 242 kA figure at 240 V makes this breaker suitable for high-fault utility entrance positions in North American 277/480 V wye systems where the line-to-ground fault current can exceed 200 kA. This variant ships without an undervoltage release, without a ground-fault monitoring module, and without a communication function — it is a pure thermal-magnetic or electronic trip unit breaker (the basic switch order code is 3VA2440-6HN32-0AA0). The auxiliary switch bay is populated with three HQ auxiliary switches, which is a high-quantity configuration for remote status indication on multiple circuits.
In a sealed, non-ventilated enclosure, that heat must be factored into the thermal rise calculation — especially if multiple breakers are ganged side by side. The 70 °C maximum operating ambient is the breaker's internal reference; enclosure internal temperature must stay below that.
This part carries a current-production lifecycle status. It is an active catalog item in the Siemens SENTRON 3VA2 platform, not a phase-out or last-time-buy SKU. That means factory support, spare parts, and accessory compatibility are all current.