Mersen A4J80 — 80 Amp 600V Class J Fuse | Fast-Acting Blade Fuse
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Mersen A4J80 — 80 Amp 600V Class J Fast-Acting Fuse
The Mersen A4J80 is a high-quality 80-amp, 600-volt fast-acting fuse that protects electrical panels, switchboards, and distribution systems from dangerous overcurrents and short circuits. Part of the trusted Amp-Trap® A4J series, this fuse delivers reliable current-limiting protection in a compact, blade-style Class J package.
Whether you're a licensed electrician replacing a blown fuse, a facility manager restocking your panel room, or sourcing for a new installation — the A4J80 is a code-compliant, UL-listed, CSA-certified choice trusted in electrical systems across the country.
Product Specifications
| Brand | Mersen (also known as Ferraz Shawmut) |
|---|---|
| Part Number | A4J80 |
| Amps | 80A |
| Voltage | 600VAC / 300VDC |
| Interrupt Rating | 200kA AC / 100kA DC |
| Fuse Class | Class J |
| Type | Fast-Acting, Current-Limiting |
| Terminal | Blade (Clip Mount) |
| Size | 1-1/8" Dia × 4-1/2" L |
| Certifications | UL Listed, CSA Certified, RoHS Compliant |
Common Uses
- Electrical panels and load centers
- Switchboards and bus ducts
- Lighting and heating circuits
- Feeder circuit protection
- Capacitors and general electrical loads
Frequently Asked Questions
- What is the Mersen A4J80 used for?
- The Mersen A4J80 is used to protect electrical circuits from overcurrents and short circuits. It is commonly installed in panelboards, switchboards, load centers, bus duct systems, and feeder circuits in commercial and industrial buildings.
- What does "Class J" mean on a fuse?
- Class J is a standardized fuse classification defined by UL. Class J fuses are current-limiting, have a compact blade-type form factor, and are designed to fit only Class J fuseholders — preventing accidental installation of a lower-rated fuse. They are widely used in commercial and industrial electrical distribution.
- Is the A4J80 the same as the Ferraz Shawmut A4J80?
- Yes, they are the same product. Ferraz Shawmut rebranded as Mersen. The A4J80 continues to be manufactured under the Mersen name with the same specifications and part number.
- What size fuse holder does the A4J80 fit?
- The A4J80 fits Class J rejection-type fuseholders rated for blade-style fuses in the 31–100A range. It measures 1-1/8" in diameter by 4-1/2" in length and uses a clip-mount blade terminal.
- Is the A4J80 available in other amp ratings?
- Yes. The Mersen A4J series is available in a wide range of ampere ratings, from 1A up through 600A. Common nearby ratings include A4J70 (70A), A4J80 (80A), A4J90 (90A), and A4J100 (100A).
- What certifications does the Mersen A4J80 have?
- The A4J80 is UL Listed, CSA Certified, and RoHS compliant, meeting North American electrical code requirements for use in commercial and industrial installations.
