Bussmann DLS-R-40 Fuse

The Bussmann DLS-R-40 Fuse is a professional-grade 600V RK5 40A Time Delay Fuse engineered for high-performance circuit protection in demanding HVACR and industrial environments. Featuring a dual-element, current-limiting design, this dual-element time-delay fuse provides ultimate protection for branch circuits and motor loads. Its 10-second minimum time-delay at 500% of the 40-amp rating ensures motor inrush currents do not cause nuisance blowing, while the separate overload and short-circuit elements allow for closer sizing to the motor Full Load Amps (FLA). This Class RK5 fuse offers a robust 200kA AIC interrupting rating, making it a reliable choice for mains and feeders in HVAC circuit protection. Built with the Bussmann Dura-Lag technology, it maintains a physical rejection feature to prevent the installation of non-current-limiting or lower-rated fuses in Class R holders, ensuring system integrity and safety compliance across 600VAC power distribution panels.

• Dual-Element Precision: Separates overload and short-circuit protection to eliminate nuisance tripping during equipment startup.
• Enhanced Sizing: Allows for sizing as close as 125% of motor FLA, permitting the use of smaller, cost-effective switches and fuse blocks.
• Industrial-Grade Interrupting Capacity: Provides a 200,000A RMS symmetrical interrupting rating for superior component protection.
• Energy Efficient: Engineered to reduce let-through energy (I2t) and peak current to protect downstream equipment.
• Standardized Compatibility: Fits Class R rejection-type fuse clips to meet NEC safety requirements.

• Can I use this fuse in a 480V system? Yes, the 600V AC rating allows this fuse to be applied to any system voltage of 600V or lower, including common 480V and 208/240V HVAC applications.
• What is the difference between DLS-R and standard RK5 fuses? The DLS-R (Dura-Lag) series is optimized for contractor needs, specifically providing heavy-duty time-delay characteristics for motors and transformers with significant surge currents.
• Why does my fuse block reject this fuse? The DLS-R-40 is a Class R rejection fuse. Ensure your fuse holder is designed for Class R (rejection) fuses; it will fit Class H or K clips, but a Class R holder will only accept Class R fuses.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.