The Siemens 3VA1140-5GD42-0AA0-ZD00 is a 4-pole IEC frame 160 circuit breaker from the 3VA1 line, rated for line protection with a fixed thermal-magnetic TM210 trip unit. The overload protection is fixed at Ir = 40 A, and the short-circuit pickup is fixed at Ii = 10 x In (400 A), so it clears a bolted fault fast while riding through motor inrush.
The nut keeper kit included in the ZD00 suffix is a mechanical aid for DC Power OEM builds in China; it keeps the terminal nuts captive during wiring, which saves time on repetitive assembly. For a panel builder, the fixed Ir and Ii mean no dials to set or seal — just torque the lugs and go.