A4J125 - 125 Amp Fuse
- 125 Amp
- 200 kA @ 600 V.AC Volts AC
Purchase Options: New In Box
A4J125 - 125 Amp Fuse Description
A4J125 - 125 Amp Fuse
Keep your high-current circuits safe and reliable with the Mersen A4J125 Amp-Trap® Class J Fast-Acting Fuse. Rated at 125 amps and designed for both 600VAC and 300VDC, this fast-acting fuse responds instantly to overloads and short circuits, helping protect your equipment and reduce costly downtime. Its blade-style terminals and unique dimensions make sure only the right fuse fits—no guesswork, no mistakes.
Built with a tough GMG body and brass alloy terminals, the A4J125 delivers consistent conductivity and long-lasting performance, even in high fault-current conditions. With a 200 kA interrupting rating, it’s a dependable choice for panelboards, motor control centers, and industrial machinery. Easy to install, reliable, and designed to perform when you need it most, this Class J fuse gives your electrical systems the protection they deserve.
Key Features and Benefits
- Fast-acting Class J fuse for instant overcurrent protection
- 125 amp rating for heavy-duty applications
- Rated for 600VAC and 300VDC
- 200 kA interrupting capacity for high fault currents
- Blade-style terminals for secure, reliable connections
- Prevents substitution with lower-rated fuses
- Brass alloy terminals for consistent conductivity
- Durable GMG body for long-lasting use
- Compact design fits standard clips and holders
- ROHS compliant
Technical Specifications
- Manufacturer Part Number: A4J125
- Product Series: A4J – Class J – Fast-Acting
- Fuse Class: Class J
- Ampere Rating: 125A
- Rated Voltage AC: 600VAC
- Rated Voltage DC: 300VDC
- Frequency: 50/60 Hz
- Interrupting Rating: 200 kA AC
- Fuse Type: Fast-Acting
- Terminal Type: Blade
- Terminal Material: Brass Alloy
- Mounting Method: Clip
- Body Material: GMG
- Product Diameter: 41.3 mm
- Product Length: 146 mm
- Product Weight: 0.342 kg
- Sell Pack Quantity: 1
- Compliance: ROHS
Material Compliance and Certifications
- ROHS compliant, the A4J125 is built with high-quality GMG insulation and brass alloy terminals to ensure consistent, reliable performance in commercial and industrial applications.
Where It Works Best
- Panelboards
- Motor control centers
- Industrial machinery
- High-current commercial electrical systems
- Any application needing fast, precise overcurrent protection
Use of Original Equipment Manufacturer (OEM) trademarks, names, and logos is for informational and identification purposes only. This does not imply any affiliation, sponsorship, endorsement, or approval by the original equipment manufacturer. CIRCUIT BREAKER SUPERSTORE® is an independent reseller and is not an authorized distributor, affiliate, or representative of any manufacturer. Manufacturer warranties do not apply unless expressly stated. All trademarks and registered trademarks are the property of their respective owners.
Mersen® is a registered trademark of Mersen S.A. Products sold are surplus, used, or refurbished and are NOT supplied by Mersen S.A. or its affiliates.
Specifications
- Width:1.5
- Depth:1.5
- Height:5.75
- Amperes:125
- A.I.C. Rating & Volts:200 kA @ 600 V.AC
- Type:A4J
- Additional Notes:Knife-Blade Style, Non-Indicating, Fast-Acting, current-limiting Class J Fuse
Returns are easy
You may return unused items within 30 days of delivery for a full refund.
FREE shipping on breaker orders over $100 and all other items with orders over $500.
CIRCUIT BREAKER SUPERSTORE® offers one to five day delivery in the United States. The variation depends on the chosen shipping speed and the warehouse location for the product(s).
Same Day Shipping
We strive to ship out your items within one business day.
In rare circumstances, CIRCUIT BREAKER SUPERSTORE® may reserve up to 5 business days to complete shipment. Feel free to contact us if your order is time sensitive.
CIRCUIT BREAKER SUPERSTORE® provides a limited 1-year warranty on both new and reconditioned products. Rest assured, all products are authentic OEM (original equipment manufacturer).