FNM-30 BUSSMANN FUSE

FNM-30 BUSSMANN FUSE

FNM-30 BUSSMANN FUSE – Industrial 30A 250VAC Midget Dual-Element Time-Delay Supplemental Fuse

The FNM-30 BUSSMANN FUSE (Model FNM-30) is an industrial-grade, dual-element time-delay midget supplemental fuse manufactured by Eaton’s Bussmann series. Engineered specifically to protect general-purpose circuits, control transformers, solenoids, and inductive equipment subject to high startup inrush currents, this 30-amp, 250 VAC Fusetron™ fuse provides reliable overcurrent and short-circuit protection.

Featuring an advanced dual-element time-delay mechanism, the FNM-30 BUSSMANN FUSE absorbs temporary motor startup surges and inductive voltage spikes without nuisance tripping. However, under sustained overload or high-energy short-circuit conditions, it opens rapidly to safely interrupt faults up to 10 kA RMS Symmetrical at 125 VAC and 250 VAC. Designed in a standardized 10 x 38 mm (13/32” x 1-1/2”) cylindrical ferrule form factor, it fits seamlessly into panel-mount fuse holders, open clips, and DIN-rail distribution blocks.

Key Features of the FNM-30 BUSSMANN FUSE

• Dual-Element Time-Delay Performance: Engineered with slow-blow time-delay characteristics to absorb harmless temporary inrush currents from inductive loads without premature opening.

• High 10 kA Interrupting Capacity: Fully rated to interrupt fault currents up to 10 kAIC at 250 VAC (125 VAC), ensuring safe circuit isolation during short circuits.

• Standardized 10 x 38 mm Midget Form Factor: Industry-standard 13/32” x 1-1/2” dimensions enable direct replacement across a wide range of industrial fuse holders.

• High-Strength Melamine Tube: Built with a durable melamine body that provides high arc-quenching capability and mechanical strength under elevated thermal operating conditions.

• Nickel-Plated End Caps: Solid bronze end caps with nickel plating deliver high conductivity and long-term resistance against corrosion.

Common Applications and Practical Usage

The slow-blow response and compact midget profile of the FNM-30 BUSSMANN FUSE make it a preferred choice for supplemental circuit protection in electrical enclosures:

• Control Transformers & Power Supplies: Protects control transformer primaries and DC power supplies against severe primary overcurrents.

• Solenoids & Relays: Prevents coil burnout in industrial solenoids, electromagnetic valves, and heavy contactor circuits.

• Fractional Horsepower Motors: Provides supplemental overload protection for small motor branch circuits subjected to frequent start-stop cycles.

• General-Purpose Lighting & Meter Circuits: Safeguards commercial lighting branch panels, HVAC controls, and auxiliary test equipment circuits.

Technical Specifications

The core electrical, physical, and compliance parameters for the FNM-30 BUSSMANN FUSE are detailed below:

Operating Guidelines and Usage Tips

SAFETY NOTICE: Always isolate power sources and verify circuits are fully de-energized using a calibrated voltage tester prior to inspecting or replacing fuses.

• Holder Selection: Pair with dedicated 10 x 38 mm midget fuse holders, panel-mount blocks (such as Bussmann HPG or HPS series), or DIN-rail clips.

• Supplemental Protection Note: FNM series fuses are supplemental fuses intended for internal equipment protection; ensure primary branch circuit protection is installed upstream in accordance with National Electrical Code (NEC®) requirements.

To review official supplemental fuse standards and low-voltage electrical circuit protection guidelines, consult the National Electrical Manufacturers Association (NEMA) Directory.

To check regional warehouse inventory availability or request commercial quotes for volume electrical fuses, visit the Control Qatar Contact Page.