Line protection MCCB with adjustable trip and high interrupt capacity
The Siemens SENTRON 3VA2440-6HL32-0HL0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries 400 A continuously across the full 40–70 °C ambient range without derating, which simplifies panel sizing when the breaker sits near other heat sources. The adjustable thermal-magnetic trip unit covers 600–4800 A, so one frame size handles a wide range of downstream loads — useful when the BOM needs to freeze a single part number across multiple panel builds. Interrupting capacity reaches 242 kA at 240 V AC and 187 kA at 415/440 V, dropping to 121 kA at 500 V and 9 kA at 690 V. At 240 V, that rating means the breaker can clear a bolted fault on a large step-down transformer secondary without upstream fuses needing to open — a real selectivity advantage in high-fault industrial services.
Auxiliary and release configuration
This variant ships with a shunt trip release (STL) for remote opening, plus two auxiliary switches, one trip alarm switch, and one electrical alarm switch. That stack covers remote status indication and emergency-off integration without adding external relay logic. The shunt trip is factory-installed; verify coil voltage against the panel control voltage before wiring. No undervoltage release, ground-fault monitoring, or communication module is fitted on this order code. If those functions are required on the customer's AML, a different 3VA2 suffix or an external add-on module would need a deviation request.
Physical fit and panel integration
Dimensions are 248 mm high, 138 mm wide, and 110 mm deep. The 138 mm width is the standard 3-pole MCCB footprint for this frame size — it fits Siemens 3VA2 mounting plates and common DIN-rail adapters without panel rework. Depth of 110 mm includes the rotary handle projection; allow clearance for cable bending radius below the line-side lugs. Maximum power dissipation is 63.5 W at rated load. In a sealed enclosure, that heat must be factored into the thermal budget — a vented or fan-cooled panel is advisable if multiple breakers are ganged.