Why Choose the Mersen HSJ40 High Speed Class J Fuse?
The Mersen HSJ40 is a high performance Class J high speed semiconductor fuse designed to provide both branch circuit protection and advanced protection for sensitive semiconductor devices. As part of the proven Mersen Amp-Trap® HSJ Series, it combines the low let-through energy (I²t) of a semiconductor fuse with the branch circuit performance of a UL Listed Class J fuse, making it an ideal choice for industrial power electronics, motor drives and automation equipment.
Designed for demanding industrial environments, the HSJ40 rapidly interrupts fault currents to help protect diodes, SCRs, GTOs, IGBTs, solid state relays and other semiconductor devices from damaging overcurrent conditions. Its compact ferrule construction allows straightforward installation into compatible Class J fuse holders while delivering exceptional fault protection and high interrupting capacity.
With a 40 A current rating, 600 V AC and 500 V DC ratings, the Mersen HSJ40 is ideally suited for variable frequency drives, soft starters, industrial control panels and power conversion equipment requiring reliable high speed overcurrent protection.
Key Advantages
- High speed Class J semiconductor protection fuse.
- 40 A current rating for industrial control applications.
- 600 V AC and 500 V DC voltage ratings.
- Combines branch circuit protection with low I²t semiconductor protection.
- Protects diodes, SCRs, GTOs, IGBTs and solid state relays.
- Compact ferrule design for installation in Class J fuse holders.
Key Features
- Mersen Amp-Trap® HSJ Series.
- 40 A rated current.
- 600 V AC / 500 V DC rated voltage.
- 50 / 60 Hz operation.
- Low I²t design for semiconductor protection.
- UL Listed Class J branch circuit protection.
- 200 kA AC / 100 kA DC interrupting rating.
- Ferrule terminal construction for clip-mounted fuse holders.
Reliable Protection for Industrial Power Electronics
The Mersen HSJ40 is engineered to minimise the effects of short circuits and severe overcurrent events in semiconductor-based equipment. Its fast acting characteristic helps reduce thermal and electrical stress on expensive electronic components, improving equipment reliability while reducing maintenance costs.
By combining branch circuit compliance with semiconductor protection, the HSJ40 simplifies electrical panel design while providing dependable protection for modern industrial automation, motor control and power conversion systems.
Typical Applications
- Variable frequency drives (VFDs).
- Soft starters.
- Industrial motor controllers.
- Power converters and rectifiers.
- Solid state relays.
- Industrial automation and control panels.
