Product Description
The FRN 50 fuse is a reliable 50‑amp, 250‑volt AC Class K5 cartridge fuse, engineered to deliver robust dual‑element, time‑delay, current‑limiting protection for circuits subject to temporary surges — such as motor starts, transformers, or lighting inrush loads. The fuse tolerates harmless transient currents while protecting against sustained overloads and short-circuits, making it ideal for panelboards, feeders, motor circuits, control panels, and general‑purpose applications.
Product Details
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Brand: Bussmann / Fusetron
- Condition: Used
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Model / Part Number: FRN 50 (sometimes “FRN-R-50” / “FRN50”)
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Fuse Class: K5
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Amperage Rating: 50 A
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Voltage Rating: 250 V AC
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Fuse Type: Dual‑Element, Time‑Delay, Current‑Limiting Cartridge Fuse
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Interrupt Rating: 200 kA @ 250 V AC
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Body Size: ~0.81″ diameter × 3.00″ length
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Connection / Termination: Ferrule‑end x Ferrule‑end (holder‑mount cartridge)
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Response Time: ≥ 10 seconds at 500% rated current (for overload tolerance)
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Certifications: UL 248‑12, CSA C22.2 No. 248.12, Class K5, CE‑marked
Key Features
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Dual‑element, time‑delay design handles motor startup and transformer inrush currents without nuisance fuse trips — ideal for inductive loads.
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Current‑limiting action reduces let‑through energy during faults, protecting wiring and downstream equipment from short‑circuit or overload damage.
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High 200 kA interrupt rating ensures safe clearing of high-fault currents in industrial and commercial applications.
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Compact K5 cartridge size — easily fits standard fuse holders for quick installation or replacement.
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Suitable for a wide variety of applications: motor circuits, panelboards, feeders, transformers, control systems, and general-purpose loads.
