The Siemens 3VA1450-6EF42-0AA0-ZD00 is a 3VA1 IEC frame 630 molded case circuit breaker with breaking capacity class H, rated Icu=70kA at 415 V. It is a 4-pole unit with line protection TM240 and ATAM, set at In=500A with overload protection Ir adjustable from 350 A to 500 A and short-circuit protection Ii adjustable from 5 to 10 times In. The N conductor is unprotected, and the breaker includes a nut keeper kit. This variant is configured for DC Power OEM applications in China.
Key Ratings and What They Mean for Fit
The 70 kA breaking capacity at 415 V (class H) means this breaker can safely interrupt fault currents up to that level without upstream devices needing to clear the fault — critical for high-fault installations like transformer secondaries or large motor control centers where available fault current exceeds standard 25 kA or 36 kA breakers. The 500 A frame with adjustable thermal (Ir) and magnetic (Ii) trip settings gives the panel builder flexibility to match the breaker to the actual load current and inrush characteristics of downstream equipment, all within the same physical frame.
Deployment Context
This breaker mounts in a standard panel enclosure on a DIN rail or direct panel-mount base, sized for the 630 A frame. The 4-pole configuration with unprotected N conductor suits three-phase systems where the neutral is not switched — typical in North American and IEC distribution panels feeding line-to-neutral loads. The nut keeper kit simplifies panel assembly by retaining hardware during installation.