Overview
The Ferraz Shawmut US3J3I K214967B is an industrial-grade 3-pole Class J fuse holder designed for reliable circuit protection in motor control centers, panel boards, and switchgear. Mersen UltraSafe modular 600 Volt fuse holders for Class J fuses introduce a new level of safety and ease for installing or replacing Class J fuses. Each unit accommodates standard Class J or 22 × 58 mm French Ferrule fuses up to 30 amps, with integral blown-fuse indicators on each pole for quick visual fault detection.
Key Features
- UltraSafe Design: UltraSafe holders qualify as “finger-safe” to an IP20 grade of protection under IEC standards
- 3-Pole Configuration: Simultaneous protection across three phases with individual indicators
- Easy Installation: Snap-mounted to 35 mm DIN-rail with a unique latch which will stay open to allow re-positioning
- Safety Lock: All units have provisions for locking in the open position for safety during fuse changeouts or equipment servicing
- Modular Expandable Design: UltraSafe holders are available in compact 1, 2, or 3 pole units, with or without blown-fuse indicators in each pole; multi-pole units can also be made up in the field
Technical Specifications
- Model: US3J3I K214967B
- Poles: 3-pole
- Fuse Rating: 30 amps, Class J
- Voltage Rating: 600VAC / 600VDC
- Fuse Type Accepted: Class J or 22 × 58 mm French Ferrule
- Wire Size: 14 to 2 AWG solid/stranded copper
- Terminal Type: Box Lug / Pressure Plate
- Mounting: 35 mm DIN-rail snap-mount
- Safety Rating: IP20 finger-safe (IEC 269-2-1)
- Indicators: LED blown-fuse indicator per pole
- Certifications: UL 248-8, UL 198-L, CSA C22.2
- Dimensions: 3.84 × 4.49 × 3.15 inches
- Weight: 1.43 lbs per unit
- Quantity per Box: 2 holders
Typical Applications
- Motor control centers (MCCs) and variable frequency drive (VFD) input protection
- Main and branch circuit protection in industrial switchgear
- Machine tool electrical distribution and automation systems
- HVAC and process equipment feeder circuits
- Three-phase power distribution in manufacturing facilities
Compatibility & Replacements
Compatible With
- Class J 30-amp fuses (22 × 58 mm)
- 35 mm standard DIN-rail mounting systems
- Industrial control panels rated 600V AC/DC
- Siemens, Allen-Bradley, Schneider Electric, ABB, and equivalent three-phase distribution systems
- Motor control circuits and VFD input stages
Replaces / Drop-In Replacement For
- Other 3-pole 30A Class J fuse holders rated 600V with similar DIN-rail footprint
- Legacy fuse blocks requiring Class J 30A protection in three-phase service
- Verify exact fit and terminal compatibility with your existing installation before ordering
Works With
- Ferraz Shawmut / Mersen Class J fuse products
- Littelfuse, Bussmann, and other IEC/UL Class J 30A fuses
- Standard 600V industrial switchgear and control systems
- Any UL 248-8 compliant Class J fuse application
