Bussmann Time Delay Fuse FRN-R Series 20A 250VAC/125VDC Class RK5 Dual Element Ferrule End

Bussmann Time Delay Fuse FRN-R Series 20A 250VAC/125VDC Class RK5 Dual Element Ferrule End

Professional-Grade Dual Element Time Delay Protection

The Bussmann Time Delay Fuse FRN-R Series delivers superior electrical protection and circuit safety for motor circuits and inductive loads. This Class RK5 time delay fuse features dual element construction 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

Dual Element Time Delay Protection

• 20 Ampere Rating - Provides precise overcurrent protection for motor and lighting circuits with reliable fault clearing capability
• 8 Second Time Delay at 500% - Allows motor starting currents while protecting against sustained overloads and short circuits
• Dual Element Construction - Combines overload and short circuit protection in single fuse for comprehensive electrical safety
• Class RK5 Current Limiting - Reduces let-through energy and arc flash hazards for enhanced electrical system protection

Safety & Standards Compliance

• 200 kAIC Interrupt Rating at 250V - Safely clears high fault currents in industrial and commercial electrical systems
• CE Marked Certification - Meets international electrical safety standards for professional installations
• Non-Indicating Design - Provides reliable protection without visual indication for standard electrical panel applications

Technical Specifications

20 ampere rating, 250VAC/125VDC voltage rating, 200 kAIC interrupt rating at 250V, 20 kAIC at 125VDC, Class RK5 current limiting, ferrule end connections, 8 second time delay at 500% rated current, dual element construction, 1.56" x 1.56" x 1.56" dimensions, 0.9 lb weight, non-indicating operation.

Installation & Setup

1. Turn off power and verify zero energy state using proper lockout/tagout procedures for electrical safety
2. Remove existing fuse using appropriate fuse pullers and inspect fuse holder for damage or corrosion
3. Insert new Bussmann FRN-R fuse ensuring proper ferrule end contact with fuse clips
4. Verify secure mechanical connection and proper fuse seating in electrical panel
5. Restore power and test circuit operation while monitoring for proper electrical protection
6. Document installation with fuse specifications for maintenance records and NEC compliance

Professional Applications

Ideal for:

• Motor Protection Circuits - HVAC motors, pump motors, conveyor systems, and industrial machinery requiring time delay protection
• Lighting Control Circuits - Commercial lighting panels, ballast protection, and fluorescent lighting systems
• Control Panel Applications - Motor control centers, electrical panels, and industrial control systems
• Transformer Secondary Protection - Distribution transformers, control transformers, and power supply circuits
• Commercial Building Systems - Electrical distribution panels, branch circuits, and facility electrical infrastructure
• Industrial Machinery - Manufacturing equipment, process control systems, and automated production lines
• Power Distribution - Electrical substations, switchgear applications, and commercial power systems
• Electrical Panel Protection - Main panels, sub-panels, and electrical distribution equipment

Dual Element Time Delay Advantage

Bussmann dual element technology provides superior motor protection by allowing harmless starting currents while quickly clearing dangerous fault conditions. The time delay element handles temporary overloads while the short circuit element provides fast fault clearing, ensuring optimal electrical system protection and equipment longevity.

Why Choose Bussmann Quality?

Bussmann commitment to electrical safety includes rigorous testing, CE marking compliance, and reliable overcurrent protection for professional installations. Our Class RK5 current limiting technology reduces arc flash hazards while providing selective coordination capability for comprehensive electrical system protection.