400 A MCCB with full-temperature rating and adjustable trip
The Siemens SENTRON 3VA2440-5HL32-0HH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying its full 400 A continuously from 40 °C through 70 °C — no derating curve to chase across the ambient range of a warm panel. The thermal-magnetic trip unit is adjustable between 600 A and 4800 A, so one breaker body covers a wide range of downstream loads or transformer inrush profiles; set it at commissioning, not at ordering. Breaking capacity reaches 187 kA at 240 V and holds 121 kA at 415 V and 440 V, dropping to 75.6 kA at 500 V and 9 kA at 690 V — the high 240 V figure suits large LV transformer secondaries or bus-tie positions where fault current is severe.
Panel fit and auxiliary configuration
Dimensions 248 mm high × 138 mm wide × 110 mm deep (9.76 × 5.43 × 4.33 in) — standard 3-pole MCCB footprint for Siemens SENTRON 3VA frames; verify bus-bar centers and mounting hole pattern against the existing panel layout. The basic switch variant is 3VA2440-5HL32-0AA0; this order code adds the shunt trip and auxiliary switches at the factory, saving panel-build labor.