Why Choose the Mersen HSJ110 High-Speed Class J Fuse?
The Mersen HSJ110 is a 110 A High-Speed Class J fuse engineered to provide superior branch-circuit and semiconductor protection in demanding industrial applications. Part of the Mersen Amp-Trap® HSJ series, it combines the branch-circuit performance of a UL Listed Class J fuse with the exceptionally low I²t characteristics required to protect sensitive power semiconductor devices.
Designed for modern industrial power systems, the HSJ110 delivers rapid fault interruption while withstanding the elevated inrush currents associated with electronic motor controllers and variable speed drives. Its current-limiting design helps reduce thermal stress on protected equipment, minimising downtime and extending equipment life.
With a 110 A current rating, 600 V AC / 500 V DC voltage rating and compact Class J blade configuration, the HSJ110 is ideal for protecting drives, soft starters, UPS systems, power converters and semiconductor-based industrial equipment.
Key Advantages
- High-speed Class J fuse for branch-circuit and semiconductor protection.
- 110 A rated current for demanding industrial applications.
- 600 V AC / 500 V DC rated voltage.
- Very low I²t reduces thermal energy during fault conditions.
- Excellent cycling capability for frequent motor starts and stops.
- UL Listed Class J design with current-limiting performance.
Key Features
- Mersen Amp-Trap® HSJ series.
- 110 A current rating.
- 600 V AC / 500 V DC rating.
- High-speed semiconductor protection characteristics.
- Class J blade fuse construction.
- Current-limiting design with low let-through energy.
- 50 / 60 Hz operation.
- Suitable for use in compatible Class J fuse holders.
Reliable Protection for Industrial Power Electronics
The Mersen HSJ110 combines the advantages of a traditional Class J branch-circuit fuse with the low I²t performance normally associated with semiconductor protection fuses. This unique combination allows engineers to protect both power semiconductors and branch circuits using a single UL Listed fuse.
Its optimised overload capability allows the fuse to withstand the high inrush currents generated by electronic motor controllers while still responding rapidly to short-circuit faults. This makes it particularly well suited to modern industrial automation systems and power conversion equipment.
Typical Applications
- Variable frequency drives (VFDs).
- Electronic motor controllers.
- Soft starters.
- Power converters and rectifiers.
- UPS systems.
- Industrial control panels and automation equipment.
