2A 20mm Glass Quick Blow Fuse - Switch Electronics - QB205-2A
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Product Information
Full details
This guide is for electronics hobbyists, repair technicians, and anyone needing reliable circuit protection. The Switch Electronics QB205-2A fuse offers quick-acting protection against overcurrents, safeguarding sensitive equipment. A key consideration is its specific 2A rating, which may not suit all applications.
All features
| Model Part Number | QB205-2A |
|---|---|
| Brand | Switch Electronics |
Extended Product Information
FAQs
What does 'Quick Blow' mean?
'Quick Blow' means the fuse is designed to react and break the circuit very rapidly when an overcurrent condition occurs, offering immediate protection to sensitive components compared to time-delay fuses.
Can I use a higher amperage fuse if the 2A blows too often?
No, you should not use a higher amperage fuse. If a 2A fuse blows during normal operation, it indicates a problem with the device drawing too much current. Using a higher-rated fuse can cause severe damage to the device or create a fire hazard.
What is the difference between glass and ceramic fuses?
Glass fuses allow for easy visual inspection as the element is visible through the clear body. Ceramic fuses are generally more robust and can withstand higher temperatures and potential arc suppression within the fuse body, making them suitable for higher-power applications.
Are these fuses suitable for 12V DC circuits?
Yes, these fuses are rated for up to 250V, making them suitable for both AC and DC circuits operating at or below 250V, including typical 12V DC applications.
How do I know if a fuse is blown?
A blown fuse typically has a visibly broken filament inside the glass tube. You can also check for continuity using a multimeter; a blown fuse will show an open circuit (no continuity).
What is the diameter of these fuses?
These fuses have a diameter of 5mm.
Troubleshooting
Fuse blows immediately upon powering on the device.
This indicates a short circuit in the device. Check wiring and components for faults. Do not replace the fuse until the short circuit is identified and repaired.
Device not powering on after fuse replacement.
Ensure the new fuse is correctly seated in the holder and is the correct amperage and voltage rating. Check the fuse holder itself for damage or corrosion.
Fuse appears intact but the device still doesn't work.
The fuse may have a microscopic break not visible to the eye, or the issue lies elsewhere in the device's circuitry. Test the fuse continuity with a multimeter if possible, or try a known good fuse.
Pros and Cons
Pros
- Offers fast-acting protection for sensitive electronics.
- Standard 20mm size allows for broad compatibility.
- Glass body enables easy visual inspection for blown fuses.
- Durable construction with nickel-plated brass caps.
Cons
- Specific 2A rating limits its use to circuits requiring this exact amperage.
- Glass body can be more fragile than ceramic fuses.
- Not suitable for high-surge applications that might momentarily exceed 2A.
- Quick-blow action might be too sensitive for some applications where temporary current spikes are normal.
Setup, Compatibility & Care
Setup: To replace a blown fuse:
- Disconnect Power: Ensure the device or circuit is completely powered off and unplugged.
- Locate Fuse Holder: Identify the fuse holder, typically a small cylindrical slot often with a removable cap.
- Remove Blown Fuse: Gently remove the old fuse. If it's difficult, use a non-conductive fuse puller tool.
- Insert New Fuse: Place the new Switch Electronics 2A 20mm fuse into the holder, ensuring it is seated correctly.
- Secure Holder: Replace and secure the fuse holder cap.
- Restore Power: Reconnect the device to power.
Compatibility: These fuses are designed to fit standard 20mm fuse holders. Always ensure the replacement fuse has the same amperage (2A) and voltage rating (250V max) as the original. Using a fuse with a higher amperage rating can lead to device damage or fire hazards. Using a fuse with a lower rating may cause it to blow unnecessarily during normal operation.
Care: Store fuses in a cool, dry place away from direct sunlight and extreme temperatures. Avoid handling the glass body excessively to prevent accidental breakage. Ensure the fuse holder contacts are clean for optimal electrical connection.