
5x20mm Fuses - Cartridge Fuses

Littelfuse makes several types of 5x20 mm fuses to provide supplemental overcurrent protection to circuits and other electronic devices such as transient voltage surge suppressors. We offer the cartridge fuses with glass or ceramic bodies. Some of the fuses are fast-acting, and others incorporate Slo-Blo® technology to deliver time-delayed circuit protection. A few change color when they blow. You will find our 5x20 mm fuses protecting uninterruptible power supplies, medical equipment, smart meters, LCD screens, and integrated circuits in household appliances.
- Operate in ac and dc electrical systems
- Wide range of voltage ratings, from 125 Vac to 600 Vac & 125 Vdc to 450 Vac
- Available with very low ampere ratings (e.g., 32 mA)
- Meet IEC or UL standards
- All fuses UL Listed or UL Recognized
- Certified lead-free and RoHS compliant
- Glass or ceramic bodies ensure durability
- Available in cartridge and axial lead form
- Can mount on printed circuit boards
- Compatible with wave soldering processes
5x20mm Fuses - Cartridge Fuses Parts
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Part Number | Actions | Maximum AC Voltage (V) | Nominal Melting I2T (A2sec) | Resistance (Ω) | Opening | Body | IEC Marking |
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Part Number | Actions | Maximum AC Voltage (V) | Nominal Melting I2T (A2sec) | Resistance (Ω) | Opening | Body | IEC Marking | |
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5x20mm Fuses - Cartridge Fuses Applications
- Used as supplementary protection in appliance or utilization equipment to provide individual protection for components or internal circuits
5x20mm Fuses - Cartridge Fuses Resources

Circuit Protection Selection Guide
Consult this guide to learn about circuit protection considerations and the solutions Littelfuse offers. Tables help match products with applications.