Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
MERSEN FUSE 600V 100A CLASS J FUSE A4J100
The A4J100 is a fast-acting Class J fuse rated for 600VAC and 300VDC with a 100A ampere rating, designed for reliable industrial circuit protection.
£36.69
Why Choose the Mersen A4J100 Class J Fast-Acting Fuse?
The Mersen A4J100 is a premium Class J fast-acting fuse designed to provide superior overcurrent and short-circuit protection for industrial and commercial electrical systems. Part of the trusted Mersen Amp-Trap® A4J series, it is ideal for feeder circuits, switchboards, panelboards, bus duct systems and general-purpose branch circuit protection.
Rated at 100 A, 600 V AC and 300 V DC, the A4J100 combines excellent current-limiting performance with high interrupting capacity. Its fast-acting characteristic rapidly clears fault currents before they reach damaging levels, helping protect conductors, switchgear and connected equipment.
The A4J100 features the unique Class J rejection design, preventing replacement with lower-rated fuse classes while providing dependable protection for sensitive electrical equipment and industrial power distribution systems.
Key Advantages
- High-performance Class J fast-acting protection.
- 100 A current rating for industrial and commercial applications.
- 600 V AC / 300 V DC voltage ratings.
- Current-limiting design reduces peak fault current and let-through energy.
- Fast operation protects sensitive electrical equipment.
- Class J rejection dimensions help prevent incorrect fuse replacement.
- Fibreglass body provides excellent dimensional stability.
Key Features
- Mersen Amp-Trap® A4J series.
- 100 A rated current.
- 600 V AC rated voltage.
- 300 V DC rated voltage.
- Class J current-limiting fuse.
- Fast-acting operating characteristic.
- 200 kA AC interrupting rating.
- 100 kA DC interrupting rating.
- Knife blade terminals.
- Fibreglass body construction.
- Suitable for 50 / 60 Hz electrical systems.
- RoHS and REACH compliant.
Fast Current-Limiting Protection
The Mersen A4J100 is engineered to clear fault currents rapidly, significantly reducing peak let-through current and energy. This helps minimise thermal and mechanical stress on downstream equipment, improving overall system reliability and reducing the risk of costly damage.
Its fast-acting design makes the A4J100 particularly suitable for protecting circuits containing sensitive electrical equipment where rapid fault interruption is required. The compact Class J rejection design also enhances installation safety by preventing substitution with lower-performance fuse classes.
Typical Applications
- Industrial control panels.
- Panelboards.
- Switchboards.
- Bus duct systems.
- Feeder circuits.
- Circuit breaker protection.
- Capacitor protection.
- Lighting and heating circuits.
- General industrial electrical loads.
Technical Specifications
Tick the specs you need, then view products that match.
| Current | 100 A | |
|---|---|---|
| Voltage | 600 V | |
| Fuse Type | UL class | |
| Fuse Class | Fast acting | |
| Item number | A4J100 | |
| Description | Fuse A4J - Class J - Fast-Acting 600VAC 300VDC 100A Blade Amp-Trap® | |
| EAN/UPC Code | 782001960322 | |
| Rated voltage AC UL | 600 V | |
| Rated voltage DC UL | 300 V | |
| Frequency (Hz) | 50/60 Hz | |
| Ampere Rating | 100 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 | Silver-Plated Copper | |
| Connection/Terminal Type | Blade | |
| Product Diameter | 27 mm | |
| Product Length | 117.6 mm | |
| Sell Pack Quantity | 5 EA | |
| Sell Pack Weight | 0.5715 kg | |
| Sell Pack Width | 136.7 mm | |
| Sell Pack Length | 152.4 mm | |
| Sell Pack Height | 26.9 mm | |
| Product group | Low Voltage UL/CSA Fuses | |
| Body/Insulating Material | GMG | |
| Product Weight | 0.1089 kg | |
| HS Code | 85361090 | |
| Country of Manufacture | Mexico |
Frequently Asked Questions
What is the Mersen A4J100 used for?
The A4J100 provides fast-acting overcurrent and short-circuit protection for industrial control equipment, feeder circuits, switchboards, panelboards and general electrical distribution systems.
What is the current rating of the A4J100?
The Mersen A4J100 has a rated current of 100 A.
What voltage ratings does the A4J100 support?
The fuse is rated for 600 V AC and 300 V DC.
What is the interrupting capacity of the A4J100?
The A4J100 provides an interrupting rating of 200 kA AC and 100 kA DC.
Is the A4J100 a time-delay fuse?
No. The A4J100 is a fast-acting Class J fuse designed to interrupt fault currents rapidly without an intentional time delay.
Why choose a Class J fuse?
Class J fuses provide high current limitation, excellent interrupting capability and rejection-style dimensions that help prevent installation of an incorrect fuse class.
Trusted for Industrial Circuit Protection
Mersen Amp-Trap® Class J fast-acting fuses are trusted worldwide by electrical engineers and industrial maintenance professionals for providing dependable current-limiting protection in demanding power distribution systems.
