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MERSEN FUSE 600V 450A CLASS J FUSE A4J450
The Fuse A4J450 Class J fast-acting fuse delivers superior circuit protection for demanding industrial applications, with a robust 600VAC/300VDC voltage rating and a high interrupting capacity.
£269.27
Why Choose the Mersen A4J450 Amp-Trap Fuse?
The Mersen A4J450 is a heavy-duty Class J fast-acting current-limiting fuse engineered to provide superior protection against overloads and short circuits in industrial and commercial power distribution systems. As part of the trusted Mersen Amp-Trap A4J series, it delivers rapid fault interruption, exceptional current limitation and dependable protection for high-current electrical installations.
Designed for demanding applications, the A4J450 significantly limits peak fault current and let-through energy, helping to minimise thermal and mechanical stress on downstream equipment such as switchboards, bus duct systems, feeders and industrial machinery. Its Class J rejection dimensions also prevent replacement with lower-rated fuse classes, maintaining system integrity and safety.
With a rated current of 450 A, a 600 V AC rating and a 300 V DC rating, the Mersen A4J450 is ideally suited to high-current feeder protection and industrial power distribution systems requiring fast-acting overcurrent protection.
Key Advantages
- Fast-acting Class J fuse for industrial circuit protection.
- 450 A current rating for high-current feeders and distribution equipment.
- 600 V AC and 300 V DC voltage ratings.
- Current-limiting design reduces damaging fault energy.
- 200 kA AC interrupting rating and 100 kA DC interrupting rating.
- Class J rejection dimensions prevent incorrect fuse replacement.
Key Features
- Mersen Amp-Trap A4J series.
- 450 A rated current.
- 600 V AC voltage rating.
- 300 V DC voltage rating.
- Fast-acting current-limiting protection.
- Blade terminal construction.
- Fibreglass body for excellent dimensional stability.
- Compatible with Class J fuse holders.
Reliable Protection for High-Current Electrical Systems
The Mersen A4J450 interrupts fault currents within milliseconds, reducing peak current and total let-through energy before damaging levels can be reached. This helps protect transformers, switchgear, busbars, cables and industrial equipment from the destructive effects of high fault currents.
The Amp-Trap A4J range is widely specified in industrial facilities, manufacturing plants and commercial power distribution systems where dependable current limitation and high interrupting capacity are essential.
Typical Applications
- Industrial feeder circuits.
- Switchboards and panelboards.
- Bus duct systems.
- Load centres.
- Industrial machinery.
- General power distribution equipment.
Technical Specifications
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| Current | 450 A | |
|---|---|---|
| Voltage | 600 V | |
| Fuse Type | UL class | |
| Fuse Class | Fast acting | |
| Item number | A4J450 | |
| Description | Fuse A4J - Class J - Fast-Acting 600VAC 300VDC 450A Blade Amp-Trap® | |
| EAN/UPC Code | 782001960476 | |
| Rated voltage AC UL | 600 V | |
| Rated voltage DC UL | 300 V | |
| Frequency (Hz) | 50/60 Hz | |
| Ampere Rating | 450 A | |
| AC or DC | AC/DC | |
| Fuse Class | Class J | |
| Speed/Characteristic | Fast-Acting | |
| Mounting | Clip | |
| AC Max I.R./Breaking Capacity | I1: 200 kA | |
| Connection/Terminal Material | Brass Alloy | |
| Connection/Terminal Type | Blade | |
| Product Diameter | 63.5 mm | |
| Product Length | 203.2 mm | |
| Sell Pack Quantity | 1 EA | |
| Sell Pack Weight | 1.4379 kg | |
| Sell Pack Width | 63.5 mm | |
| Sell Pack Length | 222.2 mm | |
| Sell Pack Height | 60.5 mm | |
| Product group | Low Voltage UL/CSA Fuses | |
| Body/Insulating Material | GMG | |
| Product Weight | 1.3698 kg | |
| HS Code | 85361090 | |
| Country of Manufacture | Mexico |
Frequently Asked Questions
What is the Mersen A4J450 used for?
The Mersen A4J450 provides fast-acting overcurrent and short-circuit protection for high-current industrial feeders, switchboards, bus duct systems and power distribution equipment.
What is the current rating of the A4J450?
The fuse has a 450 A current rating.
What voltage is the Mersen A4J450 rated for?
The A4J450 is rated for operation at up to 600 V AC and 300 V DC.
Is the A4J450 a fast-acting fuse?
Yes. The A4J450 is a fast-acting Class J current-limiting fuse that interrupts overloads and short-circuit faults extremely quickly.
Where is the A4J450 typically installed?
It is commonly installed in Class J fuse holders within industrial switchboards, bus duct systems, load centres and high-current electrical distribution equipment.
Trusted by Electrical Professionals Worldwide
Mersen Amp-Trap Class J fuses are trusted by electrical engineers, OEMs and maintenance professionals for delivering dependable overcurrent protection, excellent current limitation and reliable performance in demanding industrial environments.
