Product Overview
Fusetron FNM-4 Time-Delay 4A 250V Midget Fuse – Unused NOS
This time-delay midget fuse provides supplemental protection for circuits that experience moderate inrush currents, supporting applications where short overloads should not cause nuisance opening. Its 13/32 in / 1-1/2 in format fits common midget holders used across commercial, industrial, and equipment-based electrical assemblies.
Product Condition
Unused, New Old Stock.
Product Overview
The Bussmann Fusetron FNM-4 is a 4A, 250V AC dual-element slow-blow fuse intended for lighting circuits, meter circuits, and inductive loads such as motors and control transformers. Its time-delay behavior allows it to withstand brief surges while still providing dependable overcurrent protection. The fuse’s green body color and nickel-plated endcaps identify it as part of the Fusetron 250V supplemental series.
Key Features
- Time-delay, dual-element design
- 4 A rating with 250 VAC capability
- Interrupt rating: 200 A at 250 VAC
- 10,000 A interrupting rating at 125 VAC
- Midget dimensions: approx. 13/32 in diameter and 1-1/2 in length
- Non-indicating, non-rejection supplemental type
- Nickel-plated endcaps and green body identification
- Compatible with midget fuse holders and blocks
Applications
- Lighting and meter circuits
- Motors with moderate startup surges
- Control transformers
- General-purpose supplemental protection
- Industrial and commercial control panels
- Equipment requiring tolerance to brief overloads
Frequently Asked Questions
What type of fuse is the FNM-4?
It is a time-delay, dual-element midget fuse designed for circuits with inrush currents or temporary overloads.
Does this fuse fit standard midget holders?
Yes, its 13/32 in x 1-1/2 in size matches common midget fuse holders and blocks.
Where is this fuse typically used?
It appears in lighting circuits, equipment panels, meter circuits, and inductive-load applications.
Why choose a time-delay fuse?
The time-delay element allows the fuse to ride through short surges from motors or transformers without nuisance tripping.
You can use its inductive load support with the dual-element time-delay design when installing it into a midget holder inside your control assembly.
