Why Choose the Mersen US3J2I UltraSafe™ Class J Fuse Holder?
The Mersen US3J2I is a high-performance two-pole UltraSafe™ Class J fuse holder designed to provide safe and dependable overcurrent protection for industrial electrical systems. It accommodates Class J fuses rated up to 30 A and combines compact DIN rail mounting with a durable finger-safe construction for straightforward installation inside control panels, switchboards and power distribution equipment.
Unlike the standard US3J2 version, the US3J2I incorporates an LED blown-fuse indicator in each pole. This provides clear visual identification when an installed fuse has operated, helping maintenance personnel locate faults quickly, reduce diagnostic time and minimise disruption to machinery and production processes.
Rated for 30 A with 600 V AC and 600 V DC operation, the US3J2I provides a high 200 kA short-circuit current rating when correctly applied with approved Class J fuses. Its pressure-plate terminals, clip-in fuse installation and lockable open position make it a practical solution for demanding industrial applications.
Key Advantages
- Compact two-pole Class J fuse holder for industrial systems.
- Integrated LED blown-fuse indication in each pole.
- Compatible with Class J fuses rated up to 30 A.
- 600 V AC / 600 V DC rated operation.
- 200 kA short-circuit current rating for demanding electrical applications.
- IP20 finger-safe construction improves protection during operation and maintenance.
Key Features
- Mersen UltraSafe™ US3J series.
- Two-pole modular fuse holder.
- 30 A maximum fuse rating.
- 600 V AC UL rated voltage.
- 600 V DC UL rated voltage.
- Integrated LED indication system.
- Compatible with Mersen AJT, A4J and HSJ Class J fuses.
- Accepts compatible 22 × 58 mm ferrule fuse links in non-UL applications.
- Pressure-plate terminals with clip-in fuse installation.
- 35 mm DIN rail mounting with lockable open position.
Visible Fuse Status for Industrial Power Systems
The Mersen US3J2I securely houses two Class J fuses and provides dependable overcurrent protection for two-pole industrial circuits. Its robust polyamide housing and finger-safe construction help reduce the risk of accidental contact with live components while allowing straightforward access for fuse replacement.
The integrated LED indicators provide immediate visual notification when a fuse has operated. Combined with the lockable open position and clip-in fuse installation method, this helps improve maintenance safety, reduce fault-finding time and restore electrical equipment to service more efficiently.
Typical Applications
- Industrial control panels.
- Motor and transformer protection circuits.
- Power distribution systems.
- Heating and lighting equipment.
- OEM machinery and production equipment.
- Industrial automation systems.
