Why Choose the Mersen US3J3 UltraSafe™ Class J Fuse Holder?
The Mersen US3J3 is a premium three-pole UltraSafe™ Class J fuse holder engineered for dependable overcurrent protection in industrial power distribution systems. Designed to accommodate 30 A Class J fuses or compatible 22 × 58 mm IEC cylindrical fuse links, it combines compact DIN rail mounting with industry-leading finger-safe protection for industrial control panels, switchboards and OEM machinery.
Part of the proven Mersen UltraSafe™ US3J series, the US3J3 features a durable polyamide housing, pressure-plate terminals and a unique latch mechanism that remains open during fuse replacement, making maintenance safer and more efficient. Its compact three-pole construction simplifies panel assembly whilst maintaining excellent electrical performance.
Rated for 30 A with 600 V AC and 600 V DC operation, the US3J3 provides a 200 kA short-circuit current rating when used with approved Class J fuses. This standard version is supplied without blown-fuse indication, making it ideal for installations where visual indication is not required.
Key Advantages
- Compact three-pole Class J fuse holder for industrial installations.
- Compatible with 30 A Class J fuses.
- 600 V AC / 600 V DC rated operation.
- 200 kA short-circuit current rating.
- IP20 finger-safe construction improves operator safety.
- 35 mm DIN rail mounting for fast installation and maintenance.
Key Features
- Mersen UltraSafe™ US3J series.
- Three-pole fuse holder.
- 30 A maximum fuse rating.
- 600 V AC UL rated voltage.
- 600 V DC UL rated voltage.
- Compatible with AJT, A4J and HSJ Class J fuses.
- Compatible with 22 × 58 mm IEC cylindrical fuse links.
- 200 kA SCCR.
- Pressure-plate terminals.
- DIN rail mounting with lockable open position.
Reliable Protection for Three-Phase Industrial Power Systems
The Mersen US3J3 provides dependable overcurrent protection for three-phase electrical circuits using Class J fuses. Its compact three-pole design allows multiple protected circuits to be installed within a single assembly whilst maintaining safe finger-safe access during routine maintenance.
Designed for industrial control panels, power distribution equipment and OEM machinery, the US3J3 combines high interrupting capacity with durable construction and rapid DIN rail installation, providing long service life in demanding industrial environments.
Typical Applications
- Industrial control panels.
- Three-phase power distribution systems.
- Motor protection circuits.
- Heating and lighting circuits.
- OEM machinery.
- Industrial automation equipment.
