What this breaker is and what the ratings mean
The Siemens 3VA1150-6GE42-0AA0-ZD00 is a 4-pole IEC frame 160 molded case circuit breaker with breaking capacity class H, meaning it can interrupt 70 kA at 415 V — built for high-fault infrastructure where a lower-rated breaker would cascade upstream. Rated In=50 A with an adjustable thermal overload (Ir) from 35 A to 50 A via the TM220 / ATFM trip unit, and a fixed magnetic short-circuit pickup Ii=10 x In (500 A). That 10x multiplier gives good selectivity with downstream 10 kA MCBs on motor branch circuits. Full N-conductor protection at 100% — not reduced neutral — so it handles balanced and unbalanced loads without derating the neutral pole.
Lifecycle and sourcing reality
The nut keeper kit and DC Power OEM designation (ZD00 suffix) suggest this variant was configured for a specific Chinese OEM DC-power application, but the base 3VA1 breaker platform is standard catalog. Sourced to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time.