This Siemens 3VA1332-6EF42-0AA0-ZD00 is a 4-pole IEC frame 400 molded case circuit breaker with class H breaking capacity — 70 kA Icu at 415 V. That rating puts it in the high-interrupting tier for industrial distribution panels and transformer secondaries where available fault current runs above 50 kA. The TM240 ATAM trip unit gives adjustable thermal-magnetic protection: overload Ir from 224 A to 320 A, and short-circuit pickup Ii set at 5 to 10 times In (320 A). The N conductor is unprotected — neutral is solidly connected without an overcurrent pole — which is standard for 3-phase 4-wire systems where the neutral carries only unbalanced load.
Mounts on DIN rail or panel-mount via the 3VA1 accessory kit. The 4-pole footprint needs 4 module widths (roughly 72 mm per pole) — verify gland plate clearance before wiring. Line and load lugs accept Cu/Al conductors up to 300 kcmil. The nut keeper kit retains the terminal screws during high-vibration shipping; keep it installed until final torque-down at the panel.