Bussmann FRN-R 40A Time-Delay Fuse, 250V – 2 Pack

Protect motors and main panels with a trusted Bussmann FRN-R fuse

Designed as a heavy-duty time-delay cartridge fuse, the FRN-R 40A helps guard motors against overloads and the effects of single-phasing in three-phase systems. It allows the initial startup surge typical of motors to pass, while preventing longer, damaging overloads from progressing.

Its dual-element design delivers strong short-circuit and overload protection. When paired with compatible fuse blocks, the fuse responds quickly to fault conditions, reducing the risk of motor burnout. The device is UL Listed Class R (IR 200kA), and features a groove in the end cap or a notch in the knife blade to fit Class H, K, or R fuse blocks.

Key benefits and typical use cases

• Heavy-duty time-delay protection for motors and main panels
• Allows startup surges while preventing prolonged overloads from causing damage
• Dual-element construction provides high-performance short-circuit and overload protection
• Ideal for circuits requiring higher current or voltage ratings
• UL Listed Class R (IR 200kA) supports reliable protection in compatible assemblies
• End-cap groove or knife blade notch enables use in Class H, K, or R fuse blocks

Product details

• Includes 2 fuses per retail pack; each fuse measures approximately 2.375 in long by 1.375 in wide by 0.50 in high
• Suitable for motor protection and branch circuits with higher amp ratings
• Supports selective coordination to help prevent unnecessary outages

This fuse pair is designed for use in a wide range of commercial, industrial, and residential equipment, offering dependable protection with straightforward installation.