Lennox 57771 (P-8-418) Bussmann FRN-R-15 is a high-quality 30 Amp dual-element time-delay fuse engineered for dependable overcurrent and short-circuit protection in HVAC and electrical systems. Designed to meet Class RK5 standards, this 250 Volt fuse is built to handle temporary inrush currents while maintaining reliable protection for sensitive components such as motors, compressors, and control circuits.

This OEM-compatible fuse uses a dual-element, time-delay design that allows brief startup surges to pass without nuisance tripping, making it ideal for HVAC equipment with high inrush current demands. The Bussmann FRN-R series is widely trusted for its consistent performance, durability, and compliance with industry safety standards, helping protect equipment and reduce downtime.

Ideal for residential and commercial HVAC applications, this fuse is commonly used in disconnects, control panels, and electrical service equipment where precise circuit protection is required. Lennox 57771 is a direct replacement for Lennox P-8-418 and is suitable for both service repairs and preventive maintenance.

Product details:

Brand: Lennox / Bussmann
Lennox catalog number: 57771
Lennox part number: P-8-418
Manufacturer part number: FRN-R-15
Amperage rating: 30 Amp
Voltage rating: 250 Volt
Fuse type: Dual-element time-delay
Class: RK5
Application: HVAC and electrical circuit protection

Compatible applications:

HVAC disconnects and control panels
Air conditioners, furnaces, and heat pumps
Motor and compressor protection circuits
Residential and commercial electrical systems

This Lennox 57771 Bussmann FRN-R-15 fuse is a reliable OEM replacement choice for technicians and contractors who require safe, consistent performance and long service life. Designed for demanding HVAC environments, it helps ensure proper circuit protection while minimizing nuisance interruptions.