Ceramic Slow-Blow Fuse 5×20mm | 0.25A–20A 250V T-Type

Ceramic Slow-Blow Fuse Cartridge — 5mm × 20mm, 250V (Multiple Ratings Available)

Keep your electrical circuits protected with this high-quality ceramic slow-blow (Type T) fuse cartridge. Available in a wide range of current ratings — 0.25A, 0.5A, 1A, 2A, 3A, 5A, 8A, 10A, 15A, and 20A — these fuses are an essential component for electronics, appliances, power supplies, and DIY electrical projects.

Why Choose a Ceramic Slow-Blow Fuse?

• High-Quality Porcelain Body: Made from premium porcelain material that offers superior thermal stability and a higher breaking capacity compared to glass fuses — providing a greater level of safety for your circuits.
• Slow-Blow (Type T) Design: The time-delay fuse design allows a longer blow time, preventing nuisance trips caused by harmless surge currents at startup while still protecting against sustained overloads.
• Standard 5mm × 20mm Size: Fits the universally common 5×20mm fuse holder, making it a direct replacement for countless household appliances, power strips, audio/video equipment, and industrial control panels.
• Wide Current Range: Select from 0.25A, 0.5A, 1A, 2A, 3A, 5A, 8A, 10A, 15A, or 20A to precisely match the circuit requirement — no over-fusing, no under-protection.
• 250V Rating: Suitable for standard AC mains circuits up to 250V, covering the vast majority of residential and light commercial applications.
• Compact & Space-Saving: Each fuse measures just 5mm × 20mm, fitting neatly into existing panel-mount and inline fuse holders without modification.

Product Specifications

• Type: Slow-Blow / Time-Delay (T)
• Body Material: High-quality porcelain (ceramic)
• Size: 5mm × 20mm (approx. 0.20" × 0.79")
• Voltage Rating: 250V AC
• Current Ratings Available: 0.25A, 0.5A, 1A, 2A, 3A, 5A, 8A, 10A, 15A, 20A
• Standard: Suitable for general electrical and electronic circuit protection

Common Applications

• Home appliances (microwaves, washing machines, power supplies)
• Audio/video and consumer electronics
• DIY electronics and hobby circuits
• Power strips, extension leads, and surge protectors
• Industrial control panels and instrumentation
• Replacement fuses for automotive accessories and lighting systems

Electrical Safety Resource

For guidance on safe electrical installations and circuit protection best practices, visit the U.S. Consumer Product Safety Commission — Electrical Safety.

Frequently Asked Questions

Q: What is a slow-blow (Type T) ceramic fuse and how does it differ from a fast-blow fuse?

A: A slow-blow (Type T) fuse has a built-in time-delay element that tolerates brief, harmless inrush or startup current surges without tripping. A fast-blow fuse opens almost instantly at or above its rated current. Slow-blow ceramic fuses are ideal for motors, transformers, and capacitive loads that draw a momentary spike when powered on, while still protecting the circuit against sustained overloads.

Q: What size are these ceramic fuse cartridges?

A: Each fuse cartridge measures 5mm × 20mm — the most common standard size worldwide for panel-mount and inline fuse holders. They are rated at 250V AC and are available in current ratings from 0.25A up to 20A to suit a wide variety of circuits.

Q: Why choose a ceramic body over a glass fuse?

A: The high-quality porcelain (ceramic) body provides better thermal stability and a significantly higher breaking (interrupting) capacity than a standard glass fuse. This means the ceramic fuse can safely interrupt larger fault currents without shattering, offering a higher level of safety for both equipment and users.

Q: How do I select the correct amperage rating for my application?

A: Always match the fuse rating to the circuit's recommended specification — typically found in the appliance manual, on the fuse holder itself, or in the equipment's wiring diagram. As a general rule, do not install a fuse with a higher current rating than the circuit is designed to carry, as this defeats the purpose of overcurrent protection.