Overview
The Bussmann NON-25 is a one-time, fast-acting cartridge fuse designed for general-purpose overcurrent protection in lighting, heating, and branch circuits. These Class K5 fuses provide reliable circuit protection without time-delay characteristics, making them suitable for applications where transient surges are minimal. Each unit is rated 25 amperes at 250 volts AC and carries UL listing for safety compliance.
Key Features
- One-Time Operation: Melts and opens permanently upon overcurrent, providing positive circuit interruption
- Non-Current Limiting: General-purpose design for standard circuit protection without peak current suppression
- Class K5 Rating: Suitable for circuits from 0-60 amperes per UL Standard 248-9
- Fast-Acting Response: Immediate operation with no intentional time delay
- UL Listed: Certified for 250V AC applications and electrical safety standards
- Cartridge Form Factor: Compact design fits standard fuse holders and panels
Technical Specifications
- Amperage Rating: 25 amperes
- Voltage Rating: 250V AC
- Interrupt Rating: 50,000 AIR (Amperes Interrupting Rating)
- Fuse Class: K5 (General Purpose, 0–60A range)
- Operation Type: One-time, fast-acting (no time delay)
- Current Limiting: Non-current limiting
- Body Material: Melamine/ceramic
- Ferrule Type: K5 ferrule standard
- Certifications: UL Listed, meets UL Standard 248-9
- Package Contents: Lot of 10 units
Typical Applications
The Bussmann NON-25 is specified for general-purpose circuits that do not experience large transient surges or motor overloads. Common applications include:
- Lighting circuit protection in residential and commercial installations
- Heating element circuit protection
- Main panel and distribution board branch circuit protection
- Equipment and appliance circuits with low transient current
- Industrial control circuits where time delay is not required
Not Recommended For: Motor circuits, inductive loads, or applications requiring soft-start capability. For motor protection, specify Bussmann Fusetron (FRN-R series) heavy-duty time-delay fuses instead.
Compatibility & Replacements
Compatible With
- Standard cartridge fuse holders (K5 class)
- General-purpose distribution panels and switch equipment
- Low-voltage circuits rated 250V AC or lower
- UL-listed electrical panels and circuit protection systems
Replaces / Drop-In Replacement For
- Cooper Bussmann BP/NON-25 (OEM equivalent)
- Eaton NON-25 (equivalent specification)
- Generic Class K5 25A 250V cartridge fuses
Works With
- Cartridge-style fuse panels with K5 slots
- Industrial control systems requiring overcurrent protection
- Electrical distribution equipment compliant with UL 248-9 standards
- Any 250V AC circuit application requiring a 25A fuse
