400 A continuous, flat derating to 70°C
The Siemens 3VA2440-7HL32-0HA0 is a 3-pole SENTRON molded case circuit breaker rated for 400 A continuous at 40 °C, and it holds that full 400 A all the way up to 70 °C ambient — no derating curve to calculate for warm enclosures. Frame maximum is 4800 A, so this is a 400 A trip unit in a frame that can handle much higher fault currents. Short-circuit breaking capacity is the headline here: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 9 kA at 690 V.
Shunt trip and line-protection design
The base switch is the 3VA2440-7HL32-0AA0; this order code adds the shunt trip. No communication function, no auxiliary switch fitted — this is a straightforward distribution breaker with remote trip capability.
Width of 138 mm (5.43 in) and depth of 110 mm (4.33 in) mean it fits a typical MCCB slot in a distribution board. Height of 248 mm (9.76 in) is the tallest dimension — check clearance above the busbar chamber. No derating needed across the full operating range for this 400 A rating.