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 1A CLASS J FUSE A4J1
Fast-acting Class J fuse rated for 1 amp, 600VAC and 300VDC, featuring tin-plated copper ferrule terminals and PolyTube insulating body for industrial circuit protection.
£18.99
Why Choose the Mersen A4J1 Class J Fast-Acting Fuse?
The Mersen A4J1 is a compact Class J fast-acting fuse designed to provide dependable overcurrent and short-circuit protection for industrial and commercial electrical systems. Part of the established Mersen Amp-Trap® A4J series, it is suitable for feeder circuits, control equipment, lighting systems and other applications requiring rapid fault interruption.
With a rated current of 1 A and a voltage rating of up to 600 V AC, the A4J1 combines a high interrupting capacity with current-limiting performance. During a severe short circuit, the fuse restricts the peak fault current and clearing energy reaching downstream conductors and components.
The A4J1 has a fast-acting operating characteristic and does not intentionally delay operation during an overcurrent condition. This makes it particularly suitable for circuits containing sensitive equipment or loads with limited temporary inrush current.
Key Advantages
- Dependable Class J fast-acting circuit protection.
- 1 A current rating for low-current industrial and control circuits.
- 600 V AC voltage rating for a broad range of electrical systems.
- Current-limiting construction reduces short-circuit let-through energy.
- Fast operation helps protect sensitive downstream components.
- Class J rejection dimensions help prevent the installation of an incorrect fuse class.
Key Features
- Mersen Amp-Trap® A4J series.
- 1 A rated current.
- 600 V AC rated voltage.
- Class J current-limiting fuse.
- Fast-acting operating characteristic.
- High interrupting capacity for demanding fault conditions.
- Ferrule-style terminals for compatible Class J fuse holders.
- Compact rejection-style construction.
- Suitable for 50 / 60 Hz electrical systems.
- Designed for industrial and commercial circuit protection.
Fast-Acting Protection for Sensitive Electrical Circuits
The Mersen A4J1 is engineered to interrupt damaging overcurrents rapidly. Its current-limiting construction helps reduce the magnitude and duration of short-circuit current, limiting the thermal and mechanical stress applied to wiring, control devices and connected equipment.
Unlike a time-delay fuse, the A4J1 does not intentionally withstand prolonged temporary overcurrents. It is therefore best suited to circuits where rapid operation is preferred and normal starting or energisation currents remain close to the continuous load current.
Typical Applications
- Industrial control circuits.
- Feeder and branch-circuit protection.
- Lighting and heating circuits.
- Control transformers.
- Switchboards and distribution panels.
- Electrical machinery and automation equipment.
- Commercial and industrial electrical installations.
- Circuits containing sensitive electrical components.
Technical Specifications
Tick the specs you need, then view products that match.
| Current | 1 A | |
|---|---|---|
| Voltage | 600 V | |
| Fuse Type | UL class | |
| Fuse Class | Fast acting | |
| Item number | A4J1 | |
| Description | Fuse A4J - Class J - Fast-Acting 600VAC 300VDC 1A Ferrule Amp-Trap® | |
| EAN/UPC Code | 782001960032 | |
| Rated voltage AC UL | 600 V | |
| Rated voltage DC UL | 300 V | |
| Frequency (Hz) | 50/60 Hz | |
| Ampere Rating | 1 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 | Tin-Plated Copper | |
| Connection/Terminal Type | Ferrule | |
| Product Diameter | 20.7 mm | |
| Product Length | 57.2 mm | |
| Sell Pack Quantity | 10 EA | |
| Sell Pack Weight | 0.4627 kg | |
| Sell Pack Width | 60.5 mm | |
| Sell Pack Length | 108 mm | |
| Sell Pack Height | 42.9 mm | |
| Product group | Low Voltage UL/CSA Fuses | |
| Body/Insulating Material | PolyTube | |
| Product Weight | 0.044 kg | |
| HS Code | 85361010 | |
| Country of Manufacture | Mexico |
Frequently Asked Questions
What is the Mersen A4J1 used for?
The A4J1 provides fast-acting overcurrent and short-circuit protection for industrial control circuits, feeder circuits, lighting systems and other low-current electrical applications.
What is the current rating of the A4J1?
The Mersen A4J1 has a rated current of 1 A.
What voltage is the Mersen A4J1 rated for?
The fuse is rated for operation at up to 600 V AC.
Is the A4J1 a time-delay fuse?
No. The A4J1 is a fast-acting Class J fuse designed to interrupt overcurrents without an intentional time delay.
What does current limiting mean?
Current limiting means the fuse can interrupt a severe fault before the prospective short-circuit current reaches its maximum value, reducing the energy passed to downstream equipment.
Can the A4J1 replace another fuse class?
The replacement fuse should match the required Class J designation, current rating, voltage rating and operating characteristic. The circuit and equipment manufacturer’s specifications should always be checked before replacement.
Trusted for Industrial Circuit Protection
Mersen Amp-Trap® Class J fuses are engineered to provide compact, current-limiting protection for electrical systems requiring rapid fault clearing and dependable high-interrupting-capacity performance.
