Why Choose the Mersen US3J1 UltraSafe™ Class J Fuse Holder?
The Mersen US3J1 is a premium single-pole UltraSafe™ Class J fuse holder engineered for reliable overcurrent protection in industrial power distribution systems. Designed for use with 30 A Class J fuses or compatible 22 × 58 mm IEC cylindrical fuse links, it delivers outstanding electrical performance whilst providing enhanced safety for panel builders, OEMs and maintenance engineers.
Part of the proven Mersen UltraSafe™ US3J series, the US3J1 features an IP20 finger-safe design, durable polyamide housing and a convenient DIN rail mounting system. The holder also includes a latch that remains open during fuse replacement, simplifying maintenance and improving operator safety.
Rated for 30 A with 600 V AC and 600 V DC operation, the US3J1 is ideal for protecting motors, transformers, lighting circuits, heating equipment, control circuits and general industrial loads. This standard version is supplied without a blown-fuse indicator.
Key Advantages
- Single-pole UltraSafe™ Class J fuse holder.
- Accepts 30 A Class J fuses or compatible 22 × 58 mm IEC fuse links.
- 600 V AC / 600 V DC rated operation.
- IP20 finger-safe protection improves operator safety.
- DIN rail mounting with re-positionable latch.
- Suitable for demanding industrial power distribution applications.
Key Features
- Mersen UltraSafe™ US3J series.
- Single-pole Class J fuse holder.
- 30 A maximum current 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.
- IP20 finger-safe construction with DIN rail mounting.
Reliable Protection for Industrial Power Systems
The Mersen US3J1 provides dependable protection for Class J fuse applications whilst simplifying installation and maintenance. Its finger-safe construction helps reduce the risk of accidental contact with live components, and the hinged design allows quick fuse replacement without removing the holder from the DIN rail.
Designed for industrial control panels, power distribution equipment and OEM machinery, the US3J1 delivers reliable circuit protection for motors, transformers, lighting systems and general industrial loads whilst maintaining compliance with recognised international standards.
Typical Applications
- Industrial control panels.
- Motor protection circuits.
- Power distribution systems.
- Transformers.
- Heating and lighting circuits.
- OEM machinery and automation equipment.
