Mersen A4J450 Class J Fast-Acting Fuse, 450 A, 600 VAC / 300 VDC
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The Mersen A4J450 is a Class J fast-acting, current-limiting power fuse rated at 450 A, 600 VAC, and 300 VDC. It provides interrupting ratings of 200 kA AC and 100 kA DC, with unique Class J dimensions intended to prevent substitution by fuse classes with lower electrical ratings or current-limiting capability.
| Brand | Mersen |
| Catalog Number | A4J450 |
| Product Category | Class J Power Fuse |
| Operating Characteristic | Fast Acting, Current Limiting |
| Ampere Rating | 450 A |
| AC Voltage Rating | 600 VAC |
| DC Voltage Rating | 300 VDC |
| AC Interrupting Rating | 200 kA |
| DC Interrupting Rating | 100 kA |
| Body Material | Fiberglass |
| Overall Length | 8 in (203 mm) |
| Body Width | 2-1/2 in (64 mm) |
| Recommended 1-Pole Fuse Block | 6631J |
| Approvals and Standards | UL 248-8 Listed, CSA C22.2 No. 248.8 Certified, DC Listed to UL 248, IEC 269-2-1 |
Typical applications include capacitors, load centers, panelboards, switchboards, bus duct, feeder circuits, circuit breakers, and lighting, heating, or general-load circuits.
Apexon Supply provides B2B sourcing and replacement support for the Mersen A4J450. Buyers should verify the 450 A rating, AC and DC voltage ratings, Class J dimensions, interrupting ratings, and mounting requirements against the original electrical system.
Send the catalog number, required quantity, and application requirements to request a B2B quote and technical alignment support.
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