Axial Lead 125/250V PICO Resistance Fuse

A 2.4 x 7mm axial lead fuse with a 125/250V rating and a pico size is a small, cylindrical fuse designed for overcurrent protection in electronic devices. 這 “2.4 x 7mm” refers to its dimensions, indicating a diameter of 2.4mm and a length of 7mm. 這 “axial lead” means it has wire leads extending from each end for easy soldering onto a circuit board. The 125/250V rating specifies the maximum voltage the fuse can handle before blowing. “Pico” indicates its small size, often used in applications where space is limited.

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1. ‌Core Features and Classification‌
‌Appearance and Structure‌: Epoxy coating package, the body color is mostly green or yellow, and some models use color rings to indicate current parameters (such as 2×6mm, 3×9mm specifications).
‌Fusing Characteristics‌:
Fast type: 反應速度快, suitable for sensitive circuits;
Slow type: withstand short-term overcurrent (such as motor starting current).
‌Dual function‌: acts as a resistor in normal operation and fuses out the circuit in case of overcurrent‌.
尺寸: 2.4mm x 7mm, indicating its physical dimensions.
Axial Lead: The fuse has wire leads extending from both ends, making it suitable for through-hole mounting on a PCB.
125/250V: This indicates the maximum voltage the fuse can safely interrupt. It can be used in circuits with either 125V or 250V.
Pico: Refers to a small form factor, often used in compact electronic devices.
Resistance Fuse: A fuse is a safety device that protects circuits from overcurrent. When the current exceeds a certain threshold, the fuse element melts, breaking the circuit and preventing damage.
過流保護: The primary function of the fuse is to protect the circuit from damage caused by excessive current flow.
Electronic Applications: These fuses are commonly found in various electronic devices, including power supplies, displays, and networking equipment.

2. ‌Key parameters and models‌
‌Electrical Specifications‌:
額定電壓:
Ensure the fuse’s voltage rating is appropriate for the circuit it will be protecting.
電流額定值:
Choose a fuse with the correct current rating to match the circuit’s requirements. Using a fuse with too low a current rating will cause it to blow prematurely, while using one with too high a rating will not provide adequate protection.
Fuse Type:
Pico fuses are available in different types (e.g., 速效, time-delay). Select the appropriate type based on the specific application and the characteristics of the circuit it will protect.
Current range: 62mA to 15A, typical models such as S3090 (1A-5A), R2560 (1A-3A)‌‌.
‌Certification standards‌: Passed international certifications such as UL, CSA, 環保有害物質指令, CCC‌.

3. ‌Typical application scenarios‌
‌Consumer electronics‌: USB power adapter, overcurrent protection in charging circuits‌;
‌工業設備‌: High-density PCB board mounting (such as SMD package models);
‌Automotive electronics‌: Plug-in structure for vehicle circuit protection‌.

4. ‌Selection and usage precautions‌
‌Parameter matching‌: The model needs to be selected according to the working current, voltage and fuse speed‌;
‌Installation method‌: Tape packaging is suitable for automated patch production, and axial lead models are suitable for through-hole welding‌;
‌Prohibited substitution‌: It is strictly forbidden to use ordinary resistors or copper wires to avoid protection failure‌.