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Bussmann Fast Acting Fuse JJN Series 400A 300VAC Class T Bolted Blade End Current Limiting
Professional-Grade VFD Line Protection and Circuit Safety
The Bussmann Fast Acting Fuse JJN Series delivers superior electrical protection and circuit safety for VFD line protection applications. This Class T fast acting fuse features current-limiting technology designed for electrical contractors, industrial facilities, and commercial installations, providing the reliable overcurrent protection and industry-leading safety that electrical professionals demand.
Professional Features & Benefits
Current Limiting Protection
- 400A Current Rating - Handles high-amperage loads with reliable overcurrent protection
- Current Limiting Technology - Reduces fault current to protect downstream equipment and improve system coordination
- Very Fast Acting Response - Provides rapid fault clearing to minimize equipment damage and arc flash hazards
- Class T Design - Compact size with high interrupting capacity for space-constrained applications
Safety & Standards Compliance
- High Interrupt Rating - 200 kAIC at 300V and 20 kAIC at 160 Vdc for comprehensive fault protection
- CE Marked Compliance - Meets international safety standards for global installations
- Non-Indicating Design - Professional appearance with reliable operation indication through external monitoring
Technical Specifications
400A amperage rating, 300 VAC/160 VDC voltage rating, 200 kAIC interrupt rating at 300V and 20 kAIC at 160 VDC, Class T fuse classification, bolted blade end x bolted blade end connection, 2.75" length x 1" width x 1" height dimensions, 0.25 lb weight, current-limiting very fast acting response.
Installation & Setup
- Verify power is completely de-energized and follow lockout/tagout procedures for electrical safety
- Confirm fuse holder is rated for 400A and Class T fuse dimensions
- Install fuse with proper orientation ensuring bolted blade ends are securely connected
- Torque bolted connections to manufacturer specifications for reliable electrical contact
- Verify all connections are tight and properly seated before energizing circuit
- Test circuit operation and monitor for proper fuse performance after installation
Professional Applications
Ideal for:
- VFD Line Protection - Primary application for variable frequency drive input protection and fault clearing
- Motor Protection Circuits - High-amperage motor starter and control panel protection
- Industrial Power Distribution - Main distribution panels and electrical switchgear protection
- Commercial Building Systems - Large HVAC systems and industrial equipment protection
- Transformer Protection - Primary and secondary protection for power and control transformers
- Control Panel Applications - Industrial control systems requiring fast-acting overcurrent protection
- Electrical Switchgear - High-capacity electrical distribution and protection systems
- Power Electronics - Protection for inverters, converters, and other power electronic equipment
Current Limiting Technology Advantage
Bussmann current limiting technology provides superior fault current reduction, minimizing let-through energy and protecting downstream equipment. The very fast acting response ensures rapid fault clearing while the Class T design offers compact installation in space-critical applications, making it ideal for modern electrical systems requiring high performance protection.
Why Choose Bussmann Quality?
Bussmann commitment to CE marked compliance, reliable overcurrent protection, and electrical safety for professional installations ensures your VFD and motor protection systems operate safely and efficiently. With proven current limiting technology and fast acting response, Bussmann fuses provide the electrical protection reliability that contractors and facility managers trust.
Manufacturer Resources
Product Specs
- Amperage Rating:
- 400 A
- Class:
- Class T
- Compliances:
- CE Marked
- Connection:
- Bolted blade end x bolted blade end
- Fuse Indicator:
- Non-indicating
- Interrupt Rating:
- 20 kAIC at 160 Vdc
- Packaging Type:
- Standard
- Product Height:
- 1 in
- Product Length Depth:
- 2.75 in
- Product Weight:
- .25 lb
- Product Width:
- 1 in
- Voltage Rating:
- 300 Vac, 160 Vdc
- Product Type:
- Fast Acting Fuses
- Product Group:
- Fuses
- Department:
- Electrical
- Product Subgroup:
- Fast Acting Fuses
- Item Quantity:
- 1