What this breaker is and what the ratings mean for fit
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 headline rating — Icu=36 kA at 415 V — places it in breaking capacity class S, meaning it can safely interrupt fault currents up to 36 kA without damage to itself, which is the figure that governs selectivity coordination in a distribution board. 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
This 4-pole breaker with unprotected N conductor suits a 3-phase + N system where the neutral is not switched — typical in TN or TT networks where the neutral is solidly grounded and only the phases need overcurrent protection. The nut keeper kit (included per the order-code suffix) simplifies panel mounting on a DIN rail or busbar system; the kit holds the mounting nut captive so an installer doesn't drop it into a live panel. 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.