Bussmann JJS Series Class T Current-Limiting Very Fast-Acting Fuse

Bussmann JJS Series Class T Current-Limiting Very Fast-Acting Fuse

The Bussmann JJS Series from Eaton is a current-limiting, very fast-acting Class T fuse engineered for demanding overcurrent protection applications, including large apartment complexes, multi-family meter stacks, and VFD (variable frequency drive) line-side protection. This JJS Series fuse family is available in 1A, 15A, 25A, and 30A ratings, giving electrical contractors and property managers a single Class T platform to cover a range of branch-circuit and equipment protection needs. The very fast-acting time-current characteristic makes the JJS Series well suited for protecting sensitive VFD and motor-drive circuits where rapid clearing of overcurrent conditions is critical.

Key Features

• Amp Rating Range: Available in 1A, 15A, 25A, and 30A ratings to match the protection requirements of individual meter positions, branch circuits, and connected equipment.
• Class T Construction: Compact, current-limiting Class T fuse body designed for space-constrained panelboards, meter stacks, and switchgear.
• Very Fast-Acting Response: Very fast-acting time-current characteristic that clears fault current quickly, helping protect downstream VFD and motor-drive equipment.
• Current-Limiting Design: Current-limiting operation reduces let-through energy during a fault, helping limit damage to conductors and connected loads.
• Eaton Bussmann Series: Manufactured as part of the Eaton Bussmann JJS Series, a recognized line of Class T current-limiting fuses used across commercial and industrial electrical systems.
• Multi-Family Application Focus: Purpose-suited for large apartment complexes and multi-family meter stack installations where multiple individually metered circuits require dedicated overcurrent protection.

Technical Specifications

• Refer to manufacturer documentation for complete technical specifications.

Typical Applications

• Large Apartment Complex Electrical Systems
• Multi-Family Meter Stack Installations
• VFD (Variable Frequency Drive) Line-Side Protection
• Panelboard and Switchgear Overcurrent Protection
• Renovation and New Construction Multi-Family Projects

Why Bussmann?

Bussmann, manufactured by Eaton, is a long-standing name in current-limiting fuse technology, and the JJS Series Class T platform reflects that focus on dependable, very fast-acting overcurrent protection. For electrical professionals specifying protection across large apartment complexes, multi-family meter stacks, and VFD circuits, the JJS Series offers a consistent Class T design across the 1A to 30A range, simplifying stocking and specification while supporting code-compliant, reliable circuit protection.