What the ratings mean for fit
The 3VA4145-4ED14-3AA0: The 25 kA SCCR at 277 V per pole tells you it can clear a fault up to that level without upstream device coordination issues in a 277/480 V panel. The 45 A Ir is the continuous current the breaker carries without tripping; the fixed Ii at 10× (450 A) means instantaneous trip on high faults — typical for motor branch circuits or feeder protection where you want to ride through inrush. Because the overload is permanently set, there is no dial to mis-adjust on site.
Lifecycle and sourcing reality
This part is classified as Product class C — manufactured or produced to order, not a stocked shelf item. That means lead time is driven by the production queue, not a warehouse bin. Active lifecycle confirms no end-of-life notice is pending. For a BOM freeze or a line-down replacement, the part is sourced and quoted to order against an RFQ; availability and current pricing are confirmed at quote time.
Compliance and documentation
RoHS compliant since 13-05-19. REACH Article 33 declares lead (CAS 7439-92-1) above 0.1% w/w — this is a standard declaration for electrical contacts and solder joints; the part still ships into EU markets under the exemption. Export control is AL: N / ECCN: EAR99, no special license required for most destinations.