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4A 5x20mm Glass Fuse - CEI High-Quality Small Fuse (Pack of 20)

4A 5x20mm Glass Fuse - CEI High-Quality Small Fuse (Pack of 20)

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ComponentSpecification
Current Rating4 Amps (4A)
Voltage Rating250V AC
Fuse TypeFast-Acting (Fast-Blow)
Dimensions5mm (Dia) x 20mm (Length)
Body MaterialTransparent Glass
QuantityPack of 20 Units
Price
₹ 33.90 ₹ 33.90
(Tax included)

Product Description The CEI 4A Fast-Acting Glass Fuse is a high-reliability safety component designed to protect medium-load electronic circuits. Measuring the standard 5x20mm, this "small" format fuse is ideal for protecting power adapters, charger circuits, and small motorised appliances. With a 4-Amp rating, it acts as a sacrificial link that interrupts power during an overload, preventing expensive damage to your main controller boards and sensitive semiconductors.

Key Features

  • Rapid Fault Interruption: Designed to blow instantly when current exceeds 4A, shielding downstream components from spikes.

  • Clear Diagnostic Body: Transparent glass housing allows for a quick visual check to see if the internal filament is broken.

  • Anti-Oxidant Caps: Features nickel-plated brass caps that ensure low contact resistance and prevent corrosion over time.

  • Universal 5x20mm Size: Compatible with all standard "small" fuse holders, including PCB clips and panel-mount housings.

  • Economical Bulk Pack: Comes in a pack of 20, providing a long-term supply for maintenance and laboratory prototyping.

Technical Details

  • Breaking Capacity: Rated to safely quench internal arcs during a short circuit at 250V AC.

  • Construction: High-purity glass tube provides excellent thermal and electrical insulation after triggering.

  • Filament Precision: Calibrated wire alloy ensures accurate 4A triggering with minimal resistance during normal use.

  • Voltage Rating: Optimised for 250V AC, but equally effective in DC circuits for robotics and automotive projects.

  • Response Characteristic: "F" (Fast) type response, reacting significantly quicker than slow-blow variants to protect logic-level parts.

  • Operating Temperature: Maintains its rated current specifications within -20°C to +85°C.

  • Insulation Resistance: >100MΩ at 100V DC once blown, ensuring the circuit remains completely open.

  • Vibration Resistance: Securely crimped caps and internal supports make it suitable for mobile or vibrating equipment.

  • Storage: Indefinite shelf life when stored in dry conditions.

  • Marking: Clearly embossed with "4A 250V" on the metal caps for permanent identification.

  • RoHS Compliant: Lead-free construction for modern environmental safety standards.

  • Dielectric Strength: Capable of withstanding 500V AC for one minute across the caps before blowing.

Prototyping and Engineering Tips from Robogears

  • 9V Battery Use: In projects using 9V batteries, a 4A fuse is ideal for protecting high-current servos or small DC motors from drawing enough power to melt battery connectors during a stall.

  • 18650 Protection: For 18650 Li-ion battery arrays, use this 4A fuse to protect individual parallel strings from excessive discharge.

  • IC & Driver Safety: Perfect for protecting the L298N Dual H-Bridge Motor Driver when driving motors that have a stall current near 3.5A-4A.

  • Troubleshooting Tip: If the 4A fuse blows immediately upon startup, check for reverse polarity on your input or a shorted filtering capacitor.

  • Related Products: We recommend pairing these with our 5x20mm Inline Screw-Type Fuse Holders and 22 AWG Hook-up Wires.

Package Includes

  • 20 x 4A 5x20mm Glass Fuses (CEI Brand).

Disclaimer Images are for illustration purposes only. Always disconnect the power before replacement. Do not use a 4A fuse in a circuit rated for 1A, as this reduces the level of protection.