Why Choose the Mersen HSJ150 High-Speed Class J Fuse?
The Mersen HSJ150 is a 150 A high-speed Class J fuse designed to provide branch-circuit protection alongside the low let-through energy required for sensitive power-semiconductor equipment. Part of the Mersen Amp-Trap® HSJ range, it combines the performance of a UL Listed Class J fuse with the rapid fault interruption associated with semiconductor protection fuses.
Rated at 600 V AC and 500 V DC, the HSJ150 is suitable for demanding industrial circuits containing drives, soft starters, electronic motor controllers, phase controllers and solid-state switching equipment. Its current-limiting operation helps reduce peak fault current and thermal energy during short-circuit conditions.
The fuse features a robust blade-terminal construction, a 200 kA AC interrupting rating and optimised overload capability for circuits that experience elevated current during motor-controller starts. Its Class J format also provides rejection-style dimensional control, helping prevent the installation of an unsuitable fuse class in a compatible holder.
Key Advantages
- Combines Class J branch-circuit and semiconductor protection.
- 150 A rated current for industrial power applications.
- Suitable for circuits rated up to 600 V AC or 500 V DC.
- Low I²t performance helps minimise thermal stress on power semiconductors.
- Excellent cycling capability supports frequent equipment starts and stops.
- 200 kA AC interrupting rating for high-fault-current installations.
Key Features
- Mersen Amp-Trap® HSJ series.
- 150 A current rating.
- 600 V AC and 500 V DC voltage ratings.
- High-speed Class J operating characteristic.
- Current-limiting fuse construction.
- Blade terminals manufactured from brass.
- Optimised overload capability for electronic motor-controller starts.
- Suitable for compatible Class J fuse holders and fuse blocks.
High-Speed Protection for Industrial Power Electronics
Power-semiconductor devices such as diodes, SCRs, GTOs and solid-state relays can be damaged by fault energy before a conventional general-purpose fuse has time to operate. The Mersen HSJ150 uses a low-I²t, high-speed design to interrupt severe faults rapidly and reduce the electrical and thermal energy transferred to protected components.
The HSJ150 also provides branch-circuit protection while tolerating the temporary elevated currents associated with electronic motor-controller starting. Correct fuse selection should take account of the continuous load, system voltage, available fault current, equipment starting profile and the protection recommendations of the equipment manufacturer.
Typical Applications
- Industrial branch circuits and control panels.
- Variable frequency drives and motor-drive systems.
- Electronic motor controllers and soft starters.
- Phase controllers and power-conversion equipment.
- Solid-state relays and semiconductor assemblies.
- Industrial machinery and OEM electrical equipment.
