Why Choose the Mersen HSJ70 High Speed Class J Fuse?
The Mersen HSJ70 is a high-performance Class J high speed semiconductor fuse designed to provide dependable branch circuit protection alongside rapid protection for sensitive power electronic components. Part of the established Mersen Amp-Trap® HSJ Series, it combines Class J circuit protection with low let-through energy for demanding industrial automation, motor control and power conversion systems.
Engineered to clear damaging fault currents quickly, the HSJ70 helps protect diodes, SCRs, GTOs, IGBTs, solid state relays and other semiconductor devices. Its high speed operating characteristic limits the thermal and electrical energy reaching protected equipment, helping reduce component damage, maintenance costs and unplanned production downtime.
With a rated current of 70 A, an AC voltage rating of 600 V and a DC voltage rating of 500 V, the Mersen HSJ70 is suitable for variable frequency drives, soft starters, rectifiers, converters and industrial control equipment. Its blade-terminal construction enables secure installation in compatible Class J fuse holders and approved fused equipment.
Key Advantages
- High speed Class J fuse for semiconductor and branch circuit protection.
- 70 A current rating for industrial power and control applications.
- 600 V AC and 500 V DC ratings for versatile circuit protection.
- Low I²t performance helps minimise stress on sensitive semiconductor devices.
- Rapid fault interruption helps reduce equipment damage and costly downtime.
- Blade terminals provide secure installation and dependable conductivity.
Key Features
- Mersen Amp-Trap® HSJ high speed fuse series.
- 70 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 AC / 100 kA DC interrupting rating.
- Blade terminals for compatible clip-mounted fuse holders.
Reliable Protection for Industrial Power Electronics
The Mersen HSJ70 is 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 are often more vulnerable to overcurrent conditions than conventional electrical equipment.
Combining Class J branch circuit performance with high speed semiconductor protection can help simplify electrical panel design. The HSJ70 is particularly suitable for motor drives, power conversion assemblies and electronically controlled industrial machinery requiring coordinated overcurrent protection.
Typical Applications
- Variable frequency drives and motor controllers.
- Industrial control panels and automation systems.
- Soft starters and solid state power controllers.
- Power converters, inverters and rectifiers.
- SCR, GTO, IGBT and diode protection circuits.
- Industrial power supplies and OEM machinery.
