The Siemens 3VA1020-4ED42-0AA0-ZD00 is a 4-pole IEC frame 100 circuit breaker from the 3VA1 line, sized for line protection with a thermal-magnetic TM210 release. The fixed thermal overload Ir=20 A and fixed short-circuit pickup Ii=16 x In (320 A) make this a non-adjustable, dedicated-protection device for a specific load current, not a general-purpose feeder breaker.
Configuration and deployment context
The OEM designation for DC Power in China indicates this variant was configured for a specific equipment builder, so verify the terminal arrangement and accessory compatibility against your existing panel layout before committing the BOM line.