Siemens NSX 400-630 F NA is a molded case circuit breaker from the NSX family, designed for electrical distribution applications requiring reliable overload and short‑circuit protection. This North America variant (NSX 400NA) is rated for 690 VAC and provides an 8 kV impulse withstand, aligning with protection needs in high‑voltage installations. The 400-630 designation identifies its position within Siemens' NSX 400–630 family of molded case breakers.
