The Siemens SENTRON 3VA2340-7HL32-0AH0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current, built around the ETU320 electronic trip unit. It delivers 330 kA breaking capacity at 240 V AC, dropping to 242 kA at 415 V and 440 V, 187 kA at 500 V, and 52.5 kA at 690 V — numbers that tell you it is sized for high-fault-current main feeders in industrial switchboards, not branch circuits.
What the ratings mean for fit
The 400 A rating holds flat from 40 °C through 50 °C ambient (-), then derates to 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C (-). If your panel ambient runs above 50 °C, the effective continuous current drops — size the upstream transformer and buswork accordingly. The 800 V rated insulation voltage covers 480 V and 600 V class systems with margin. Breaking capacity at 690 V is 52.5 kA — enough for most 690 V industrial networks, but verify against your transformer impedance and fault study. The ETU320 electronic trip unit provides adjustable overload and short-circuit protection curves; it is line-protection configured, meaning no voltage trip, undervoltage release, or ground-fault monitoring built in.
Panel integration notes
Dimensions are 248 mm high, 138 mm wide, 110 mm deep. The 138 mm width is a standard 3-pole MCCB footprint for this frame size — verify busbar spacing and enclosure cutout against your panel layout. Front-face protection is IP40, suitable for dry indoor switchgear; no washdown rating. Auxiliary contact configuration is 2 auxiliary switches plus 1 trip alarm switch — the HQ designation indicates high-quantity switching endurance. Max power loss is 96 W; factor that into enclosure thermal rise calculations.