The Siemens 3VA1163-6GD42-0AA0-ZD00 is a 4-pole IEC frame 160 circuit breaker in breaking capacity class H, meaning it can interrupt 70 kA at 415 V — enough headroom for high-fault industrial mains where a lower-rated breaker would cascade upstream. The N conductor is protected at 100%, which matters when you're running a balanced three-phase load and need the neutral fully rated rather than derated.
Snaps onto DIN rail in the enclosure. The nut keeper kit included for the DC Power OEM variant in China means the terminals accept ring lugs with a captive nut — saves fumbling with loose hardware when you're wiring a packed panel. The 4-pole format (three phases plus fully rated neutral) fits standard IEC distribution boards.