IEC frame 400 breaker with TM240 ATAM — 400 A, 55 kA @ 415 V
The Siemens 3VA1340-5EF32-0AA0-ZD00 is a 3-pole IEC frame 400 circuit breaker in the 3VA1 series, rated In=400A with a breaking capacity class M delivering Icu=55kA at 415V. That 55 kA SCCR at 415 V means it safely interrupts fault currents up to that level without cascading upstream — sized for high-fault commercial and light-industrial switchboards where the available fault current is substantial. The TM240 ATAM trip unit provides adjustable overload protection (Ir = 280 A to 400 A) and fixed short-circuit protection (Ii = 5 to 10 x In). The thermal-magnetic design means no auxiliary power needed for the trip function — it responds to overload current directly. This variant includes a nut keeper kit and is configured for a DC Power OEM in China, so the termination hardware and any OEM-specific markings are already in place.