Why Choose the Mersen HSJ17-1/2 High-Speed Class J Fuse?
The Mersen HSJ17-1/2 is a 17.5 A high-speed Class J fuse designed to provide branch-circuit protection and rapid fault interruption for sensitive power-electronic equipment. Part of the Mersen Amp-Trap® HSJ range, it combines the rejection-style dimensions of a Class J fuse with low let-through energy for improved semiconductor protection.
The HSJ17-1/2 is suitable for industrial circuits containing variable frequency drives, electronic motor controllers, rectifiers, inverters and solid-state components. Its current-limiting construction helps reduce peak fault current and thermal stress during short-circuit conditions, protecting equipment and helping minimise costly downtime.
Rated at 17.5 A, 600 V AC and 500 V DC, the Mersen HSJ17-1/2 provides a compact protection solution for industrial control panels and power-conversion equipment. It should be installed in a compatible Class J fuse holder or fuse block with suitable voltage, current and short-circuit ratings.
Key Advantages
- Combines Class J branch-circuit and semiconductor protection.
- 17.5 A current rating for lower-current industrial applications.
- Suitable for circuits rated up to 600 V AC or 500 V DC.
- High-speed operation helps protect sensitive power-semiconductor devices.
- Current-limiting performance reduces peak fault current and let-through energy.
- Class J rejection dimensions help prevent incorrect fuse substitution.
Key Features
- Mersen Amp-Trap® HSJ series.
- 17.5 A rated current.
- 600 V AC and 500 V DC voltage ratings.
- High-speed Class J operating characteristic.
- Low I²t performance for semiconductor protection.
- Current-limiting fuse construction.
- Designed to tolerate normal drive and motor-controller inrush conditions.
- Suitable for compatible Class J fuse holders and fuse blocks.
Fast Protection for Sensitive Power Electronics
Power-semiconductor devices can be damaged by fault energy before a conventional general-purpose fuse has time to operate. The Mersen HSJ17-1/2 uses a high-speed fuse element and low-I²t design to interrupt severe faults rapidly, limiting the thermal and electrical energy transferred to connected components.
Its Class J construction also provides branch-circuit protection and rejection-style dimensional control. Correct fuse selection should consider the system voltage, continuous load current, temporary inrush current, available fault current and the protection recommendations supplied by the equipment manufacturer.
Typical Applications
- Variable frequency drives and motor-drive systems.
- Electronic motor controllers and soft starters.
- Industrial rectifiers, inverters and power converters.
- Uninterruptible power supply equipment.
- Solid-state relays and semiconductor assemblies.
- Industrial control panels and OEM machinery.
