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 400A CLASS J HS FUSE HSJ400
The HSJ400 delivers exceptional high-speed circuit protection with a 600VAC/500VDC rating and a robust 400A current capacity, minimising downtime for critical industrial applications.
£309.99
Why Choose the Mersen HSJ400 High Speed Class J Fuse?
The Mersen HSJ400 is a high performance Class J high speed semiconductor fuse designed to provide branch circuit protection alongside low let-through energy for sensitive power electronic components. As part of the established Mersen Amp-Trap HSJ Series, it combines the protective characteristics of a semiconductor fuse with the branch circuit performance of a UL Listed Class J fuse.
The HSJ400 is engineered to interrupt damaging fault currents rapidly, helping protect diodes, SCRs, GTOs, solid state relays and other semiconductor devices. Its high speed operating characteristic limits the thermal and electrical energy passed to protected equipment, reducing the risk of component damage, costly repairs and unplanned industrial downtime.
With a rated current of 400 A, an AC voltage rating of 600 V and a DC voltage rating of 500 V, the Mersen HSJ400 is suitable for variable frequency drives, soft starters, power conversion equipment and industrial control systems. Its blade terminals and clip-mounted format provide secure installation in compatible Class J fuse holders and approved electrical equipment.
Key Advantages
- High speed Class J fuse for semiconductor and branch circuit protection.
- 400 A current rating for demanding industrial power applications.
- 600 V AC and 500 V DC ratings for AC and DC circuits.
- Low I²t performance helps protect sensitive semiconductor components.
- High 200 kA AC interrupting capacity for severe fault conditions.
- Heavy-duty blade terminals provide secure clip-mounted installation.
Key Features
- Mersen Amp-Trap HSJ high speed fuse series.
- 400 A rated current.
- 600 V AC / 500 V DC rated voltage.
- 50 / 60 Hz operating frequency.
- Class J branch circuit protection.
- Low let-through energy for semiconductor protection.
- 200 kA maximum AC interrupting rating.
- Brass blade terminals for reliable electrical connection.
Reliable Protection for Industrial Power Electronics
High speed fuses such as the Mersen HSJ400 are designed to interrupt short-circuit currents before excessive fault energy can damage sensitive semiconductor components. By limiting peak current and let-through energy, the fuse helps protect electronic switching devices that can be more vulnerable to overcurrent conditions than conventional electrical equipment.
The HSJ400 combines Class J branch circuit performance with high speed semiconductor protection, helping simplify industrial electrical system design. It is particularly suitable for high-current applications involving motor drives, power conversion assemblies and electronic control equipment.
Typical Applications
- Variable frequency drives and motor controllers.
- Industrial control panels and automation systems.
- Soft starters and solid state relays.
- Power converters, inverters and rectifiers.
- SCR, GTO and diode protection circuits.
- Industrial power supplies and OEM machinery.
Technical Specifications
Tick the specs you need, then view products that match.
| Current | 400 A | |
|---|---|---|
| Voltage | 600 V | |
| Fuse Type | UL class | |
| Item number | HSJ400 | |
| Description | Fuse HSJ - Class J - High-Speed 600VAC 500VDC 400A Blade Amp-Trap® | |
| EAN/UPC Code | 782001329709 | |
| Rated voltage AC UL | 600 V | |
| Rated voltage DC UL | 500 V | |
| Frequency (Hz) | 50/60 Hz | |
| Ampere Rating | 400 A | |
| AC or DC | AC/DC | |
| Fuse Class | Class J | |
| Speed/Characteristic | High Speed | |
| Mounting | Clip | |
| AC Max I.R./Breaking Capacity | I1: 200 kA | |
| Connection/Terminal Material | Brass | |
| Connection/Terminal Type | Blade | |
| Product Diameter | 54 mm | |
| Product Length | 181.1 mm | |
| Sell Pack Quantity | 1 EA | |
| Sell Pack Weight | 0.8528 kg | |
| Sell Pack Width | 53.8 mm | |
| Sell Pack Length | 53.8 mm | |
| Sell Pack Height | 184.1 mm | |
| Product group | Low Voltage UL/CSA Fuses | |
| Body/Insulating Material | GMG | |
| Product Weight | 0.8119 kg | |
| HS Code | 85361090 | |
| Country of Manufacture | Mexico |
Frequently Asked Questions
What is the Mersen HSJ400 used for?
The HSJ400 provides high speed overcurrent protection for power semiconductor devices while also delivering Class J branch circuit protection.
What is the current rating of the HSJ400?
The Mersen HSJ400 has a rated current of 400 A.
What voltage ratings does the HSJ400 support?
The fuse is rated for circuits operating at up to 600 V AC or 500 V DC.
What is the interrupting capacity of the HSJ400?
The HSJ400 has a maximum AC interrupting capacity of 200 kA, making it suitable for industrial systems with high available fault currents.
How is the Mersen HSJ400 installed?
The fuse uses brass blade terminals and is installed in compatible clip-mounted Class J fuse holders, fused switches or approved electrical equipment.
Trusted for Industrial Circuit Protection
Mersen Amp-Trap HSJ fuses are widely selected by automation engineers, panel builders and equipment manufacturers requiring dependable branch circuit protection and rapid fault interruption for sensitive industrial power electronics.
