Integrator's terse spec recap
The SENTRON 3VA2340-6HN32-0CC0 is a 3-pole molded case circuit breaker rated for 400 A continuous current at 40–50 °C, with a maximum breaking capacity of 242 kA at 240 V AC. It is designed for line protection and includes an undervoltage release (UVR) as standard, plus two HQ auxiliary switches. The unit measures 138 mm wide × 248 mm high × 110 mm deep, fitting standard panel cutouts for this frame class.
Breaking capacity — what the ratings mean for coordination
The 242 kA at 240 V is the maximum short-circuit current this breaker can safely interrupt at that voltage level — critical for high-fault locations like transformer secondaries or large motor control centers. At 415 V and 440 V the rating holds at 187 kA, dropping to 121 kA at 500 V and 7.5 kA at 690 V. The steep decline above 500 V is typical for this frame class; verify the available fault current at your system voltage before specifying. The 400 A continuous rating is maintained up to 50 °C ambient; above that, derate linearly to 340 A at 70 °C.
Panel integration notes
The 138 mm width and 110 mm depth fit standard MCCB panel cutouts for this frame class; the 248 mm height requires clearance for the rotary handle and auxiliary switch wiring. The undervoltage release (UVR) is factory-installed — verify coil voltage matches your control circuit before panel wiring. The two HQ auxiliary switches provide status feedback for PLC or SCADA inputs. Maximum power loss of 98.5 W should be factored into enclosure thermal calculations, especially in sealed cabinets.