MCCB for 400 A feeder protection
The Siemens 3VA2440-8HL42-0AA0 is a SENTRON 3VA2 molded case circuit breaker rated for 400 A continuous current across its full ambient temperature range from 40 °C to 70 °C — no derating needed up to that ceiling. It carries an ETU320 electronic trip unit with an adjustable magnetic short-circuit release spanning 600 A to 4,400 A, so you set the instantaneous pickup to coordinate with downstream devices rather than relying on a fixed magnetic shelf. The 4-pole design (3 poles + switched neutral) suits it for TN-S or TT systems where the neutral needs isolation alongside the phases.
Interrupting capacity across voltage classes
This MCCB delivers 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V. Those numbers tell you it can sit on the main or tie breaker of a high-fault panel without needing a current-limiting fuse upstream — the interrupting ratings cover virtually any industrial service entrance or distribution board up to 690 V. The 52.5 kA at 690 V is still well above typical transformer-fed fault levels for 690 V drives and motor control centers.
Panel fit and integration
Dimensions are 248 mm high, 184 mm wide, 110 mm deep — a compact footprint for a 400 A frame. The 110 mm depth means it clears standard 200 mm deep enclosures with room for rear bus connections. No undervoltage release or shunt trip fitted from the factory (: No), so if you need UVR or MX add-on accessories, those are separate order codes that plug into the accessory slot on the left side of the breaker.