Bussmann Time Delay Midget Fuse FNQ Series 20A 500V Non-Indicating Ferrule End

Bussmann Time Delay Midget Fuse FNQ Series 20A 500V Non-Indicating Ferrule End

Professional-Grade Motor Control and Transformer Protection

The Bussmann Time Delay Midget Fuse FNQ Series delivers superior electrical protection and circuit safety for motor control transformers and circuits with high in-rush currents. This time-delay midget fuse features advanced 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

Time Delay Protection

• Motor Starting Protection - Allows temporary overloads during motor startup while protecting against sustained overcurrent conditions
• In-Rush Current Tolerance - Handles transformer energization and capacitive switching without nuisance tripping
• Selective Coordination - Works with upstream protective devices to isolate faults at the lowest level
• Current Limiting Technology - Reduces available fault current to protect downstream equipment and personnel

Safety & Standards Compliance

• CE Marked Certification - Meets European safety and performance standards for international installations
• 10 kAIC Interrupt Rating - Safely clears fault currents up to 10,000 amperes at 500VAC
• Non-Indicating Design - Provides reliable protection without visual indication for cost-effective installations

Technical Specifications

20 ampere current rating, 500 volt AC operating voltage, 10 kAIC interrupt rating at 500VAC, midget fuse dimensions 1.5" x 0.41" x 0.41", ferrule end x ferrule end connection, nickel-plated bronze endcaps, 0.175 lb weight, time-delay response characteristic for motor and transformer applications.

Installation & Setup

1. Verify power is OFF and use proper lockout/tagout procedures before installation
2. Inspect fuse holder for proper size compatibility and clean contact surfaces
3. Insert fuse ensuring ferrule ends make secure contact with fuse holder terminals
4. Verify proper amperage rating matches circuit protection requirements
5. Test installation with appropriate electrical testing equipment
6. Document installation per NEC requirements and facility maintenance records

Professional Applications

Ideal for:

• Motor Control Circuits - Primary and secondary protection for motor starters and control transformers
• Transformer Protection - Control and distribution transformer overcurrent protection
• Industrial Control Panels - Machine control circuits and automation equipment protection
• HVAC Systems - Fan motor and compressor control circuit protection
• Lighting Control - Ballast and LED driver protection in commercial installations
• Power Distribution - Secondary distribution and branch circuit protection
• Process Control - Instrumentation and control system power protection
• Commercial Buildings - Elevator controls, fire safety systems, and building automation

Time Delay Technology Advantage

Bussmann's time delay technology provides superior discrimination between temporary overloads and dangerous fault conditions. The dual-element design allows motors to start normally while providing fast fault clearing for short circuits, ensuring optimal system reliability and reducing nuisance outages in critical applications.

Why Choose Bussmann Quality?

Bussmann's commitment to electrical safety excellence includes rigorous testing, CE marking compliance, and proven current-limiting performance. Our midget fuses provide reliable overcurrent protection with consistent time-delay characteristics, ensuring safe and dependable operation in motor control and transformer applications where electrical professionals demand the highest standards.