The 400 A full-scale value is the continuous current rating at 40 °C, 45 °C, and 50 °C — it holds the full 400 A through that range without derating. Above 50 °C you step down: 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C (–). The interrupting capacity is where this part earns its keep: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V. The adjustable trip range runs from a minimum of 600 A up to the 4 000 A maximum, with an initial setting of 80 A, so it covers a wide band of overload and short-circuit protection settings. The communication function means it can report status or accept commands over a network, though the evidence doesn't specify which protocol. The breaker also has an undervoltage release option noted as 'No', so if you need UVR you'd look at a different suffix. Trip indicator is not fitted.
The breaker measures 248 mm high, 184 mm wide, and 110 mm deep — that's 9.76 by 7.24 by 4.33 inches. It's a standard SENTRON 3VA2 form factor, so it mounts into the same Siemens panelboard and switchgear footprints as other 3VA2 frames of this size.
Key specs at a glance for the integrator
The supplied basic switch order code is 3VA2340-5JQ42-0AA0, which is the base breaker without the shunt trip — so this -0HA0 variant adds the STL. No auxiliary switch is fitted.