What this breaker carries — and what that means on the panel
The Siemens 3VA1120-6ED42-0AA0-ZD00 is a 4-pole IEC frame 160 molded case circuit breaker with a 70 kA Icu at 415 V — breaking capacity class H. That rating means it can interrupt a 70 kA fault current at 415 V without welding the contacts or rupturing the arc chamber, which is the kind of SCCR headroom you need downstream of a large transformer or in a high-fault distribution board. The TM210 trip unit gives fixed thermal-magnetic protection: Ir = 20 A overload (fixed) and Ii = 16 × In short-circuit pickup, so the breaker coordinates with standard motor-starting inrush without nuisance trips. The neutral conductor is unprotected (N-conductor unprotected), so this variant is wired for a 3-pole + solid neutral scheme — common in IEC distribution where the neutral is bonded at the source and not switched.
Deployment context — where this lands in the enclosure
The nut keeper kit (included per the order-code suffix) simplifies captive-fastener assembly for OEM panel builders, especially in repetitive build scenarios. The 4-pole footprint occupies the same frame 160 cutout as other 3VA1 breakers, so existing busbar and cable layouts transfer without rework.