What this 3VA1 breaker is and what it does
The Siemens 3VA1220-4EF42-0AA0-ZD00 is a 4-pole IEC frame 250 molded-case circuit breaker with a TM240 thermal-magnetic trip unit rated at 200 A continuous (In=200A). It carries a 36 kA breaking capacity at 415 V (class S), meaning it can safely interrupt fault currents up to that level on a 400 V distribution bus without cascading upstream — a key number for panel SCCR compliance. Overload protection is adjustable from 140 A to 200 A (Ir), and short-circuit magnetic pickup is fixed at 5 to 10 times In, so it coordinates with downstream branch breakers in a selective scheme.
Deployment context and panel integration
This breaker mounts on a DIN rail or directly to a backplate in a standard 4-pole footprint. The nut keeper kit (included) simplifies busbar or cable lug termination on the line and load sides — a time-saver for panel builders wiring multiple breakers in a row. The N conductor is unprotected (solid neutral), so this unit is intended for 3-phase + N systems where the neutral is not switched or protected.