Why Choose the Mersen HSJ90 High Speed Class J Fuse?
The Mersen HSJ90 is a high-performance Class J high speed semiconductor fuse designed to combine dependable branch circuit protection with low let-through energy for sensitive power electronic components. Part of the proven Mersen Amp-Trap® HSJ Series, it provides Class J protection while helping safeguard semiconductor devices such as diodes, SCRs, GTOs and solid state relays.
Engineered for demanding industrial environments, the HSJ90 interrupts damaging fault currents rapidly to limit the thermal and electrical energy reaching protected equipment. This high speed performance can reduce the risk of semiconductor damage, costly repairs and unplanned production downtime in motor control and power conversion systems.
With a rated current of 90 A, voltage ratings of 600 V AC and 500 V DC, and an AC interrupting capacity of 200 kA, the Mersen HSJ90 is suitable for variable frequency drives, soft starters, rectifiers and industrial automation equipment. Its silver-plated copper blade terminals support secure clip-mounted installation in compatible Class J fuse holders.
Key Advantages
- High speed Class J fuse for semiconductor and branch circuit protection.
- 90 A current rating for industrial power applications.
- 600 V AC and 500 V DC voltage ratings.
- Low I²t performance helps protect sensitive power semiconductor components.
- 200 kA AC interrupting capacity for high available fault currents.
- Silver-plated copper blade terminals provide reliable electrical conductivity.
Key Features
- Mersen Amp-Trap® HSJ high speed fuse series.
- 90 A rated current.
- 600 V AC / 500 V DC rated voltage.
- 50 / 60 Hz operating frequency.
- UL Listed Class J branch circuit performance.
- Low let-through energy for semiconductor protection.
- 200 kA AC maximum interrupting rating.
- Blade terminals for compatible clip-mounted fuse holders.
Reliable Protection for Industrial Power Electronics
The Mersen HSJ90 is designed to clear short-circuit currents before excessive fault energy can damage sensitive semiconductor devices. Its low I²t characteristic limits peak current and let-through energy, helping protect electronic switching components that may be more vulnerable to overcurrent conditions than conventional electrical equipment.
By combining Class J branch circuit performance and high speed semiconductor protection in a single fuse, the HSJ90 can simplify panel design and protective device coordination. It is particularly well suited to industrial motor drives, power conversion assemblies and electronically controlled machinery.
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, diode and solid state relay protection.
- Industrial power supplies and OEM machinery.
