What the ratings mean for fit
The Siemens 3VA1332-6GE42-0AA0-ZD00 is a 4-pole IEC frame 400 circuit breaker with a 70 kA breaking capacity at 415 V (class H). That 70 kA Icu means it can safely interrupt a fault current up to 70,000 A without welding its contacts or rupturing — critical for high-fault locations like transformer secondaries or large motor control centers where the available short-circuit current is high. The TM220 thermal-magnetic trip unit gives you adjustable overload protection from 224 A to 320 A (Ir) and a fixed short-circuit pickup at 10 x In (3,200 A), so it covers feeder or large motor branch circuits in a single device. The 4-pole design with 100% N-conductor protection means the neutral pole is fully rated and trips with the phases — required for 3-phase + N distribution where unbalanced loads or harmonics can overload the neutral. The nut keeper kit and DC Power OEM suffix indicate it ships with hardware for DC-side applications (e.g., battery or rectifier feeds) and is configured for OEM integration in China.