The BP/FNM‑20 from Bussmann Corporation is a time‑delay (slow‑blow) supplemental cartridge fuse engineered to provide reliable overcurrent protection for circuits that experience high inrush or startup currents. Designed as part of the trusted Bussmann FNM Series, this fuse helps prevent nuisance openings while still delivering dependable protection against sustained overloads and short‑circuit conditions.

With a 20 amp current rating and compatibility with 250‑volt AC applications, the BP/FNM‑20 is ideal for protecting internal components such as control circuit wiring, motor control transformers, solenoids, and small motors. Its dual‑element time‑delay construction allows temporary current surges during equipment startup while maintaining compliance with industry safety standards.

The fuse features a standard midget cartridge size (13/32 in × 1‑1/2 in) for broad compatibility with common fuse holders and blocks. A green color‑coded body identifies its voltage class for easier field recognition. Packaged in a convenient 2‑count retail card, the BP/FNM‑20 is well suited for maintenance, service, and replacement inventory in residential, commercial, and light industrial environments.

Key Features

• Time‑delay (slow‑blow) operation allows inrush currents without nuisance opening
• Dual‑element construction for dependable overload and short‑circuit protection
• 20 amp rating for supplemental protection of control and inductive circuits
• Rated for 125V and 250V AC applications
• Midget cartridge form factor for compatibility with standard holders and blocks
• Color‑coded green body for quick voltage class identification
• Retail 2‑pack convenient for service, maintenance, and replacement stock
• Bussmann‑engineered quality for consistent performance and long service life

Specifications

• Manufacturer: Bussmann Corporation
• Model / Part Number: BP/FNM‑20
• Series: FNM
• Fuse Type: Cartridge fuse, time‑delay (slow‑blow), supplemental
• Current Rating: 20 Amp
• Voltage Rating: 125 VAC / 250 VAC
• Interrupt Rating: 10 kA at 125 VAC; 35 A at 250 VAC
• Fuse Size: 13/32 in diameter × 1‑1/2 in length (midget size)
• Element Type: Dual element
• Body Material: Melamine / fiber tube
• End Cap Material: Metal, nickel‑plated
• Fuse Style: Non‑indicating
• Approvals: UL Listed, CSA Certified
• Packaging: Retail card
• Quantity: 2 fuses per card (2/CD)

Applications

• Motor control transformers
• Small motors and inductive loads
• HVAC equipment and controls
• Industrial and commercial control panels
• Meter circuits and lighting control circuits
• General‑purpose supplemental circuit protection