What this breaker is and what it does
Siemens 3VA1125-6EE32-0AA0-ZD00 is a 3-pole IEC frame 160 circuit breaker with 70 kA breaking capacity at 415 V (class H). Thermal-magnetic trip unit TM220 (ATFM) set at In=25 A. Overload Ir adjustable 18 A to 25 A; short-circuit pickup Ii fixed at 12.8 x In.
Lifecycle and sourcing reality
The "ZD00" suffix indicates a China DC Power OEM variant that includes a nut keeper kit. That kit is a mechanical detail — it does not change the electrical ratings or the trip unit behavior. If you are stocking a spare for a line built in China, this is the exact fit. For a retrofit into a standard Siemens 3VA1 panel, the nut keeper is an add-on, not a compatibility issue.