5×20 mm Fast (Slow) Tube Fuses With Leads

O 520 fuse is a cylindrical glass or ceramic fuse tube with a diameter of 5mm and a length of 20mm. The rated voltage is usually 250V, and the current ranges from 0.1A to 30A.

There are two main types of 5*20 fusíveis: fast-blow type (F type) and slow-blow type (T type). Fast-blow type is suitable for general electronic equipment, while slow-blow type is suitable for equipment with large starting current such as motors. The current specifications are very wide, ranging from the smallest 0.1A to the largest 30A.

F5AL Fast-Blow Fuse 5A 250V Glass Fuses 0.2 x 0.79 polegada, 5 x 20 milímetros (5Amp)

2A 250V 5mm x 20mm Fast-Acting Glass Tube Cartridge Fuse

5 * 20mm Axial Glass fuse tube With Lead Wire size picture

Regarding application scenarios, this type of fuse is widely used in home appliances, industrial equipment, automotive electronics and other fields. Parameters that need to be paid attention to when purchasing include rated current, rated voltage, fusing characteristics (fast or slow), and certification standards (such as UL, CSA, VDE, etc.).

There are also different types of 5*20 fuse holders, such as direct plug-in type, waterproof type with leads, and PCB mounting type. Waterproof fuse holders are suitable for harsh environments such as outdoor lighting. The current carrying capacity of the fuse holder is usually 6-10A, and can reach up to 30A.

5*20 fuse is a standard size (5mm diameter, 20mm length) cylindrical circuit protection component, mainly used for overcurrent protection. The following is its core characteristics and application information:

EU. Basic specifications and types
‌Size standard‌
Unified cylindrical design with a diameter of 5mm×length of 20mm, glass or ceramic package, and metal cap electrodes at both ends. ‌
‌Glass tube‌: transparent and visible, easy to observe the fuse status (common in low-voltage household appliances).
‌Ceramic tube‌: strong high temperature resistance, suitable for industrial environments. ‌

‌Current and voltage range‌
‌Rated voltage‌: mainstream is 250V, and some models support 125V. ‌
‌Current range‌: Covering ‌0.1A~30A‌, common segments include:
‌Small current‌ (≤1A): 0.1UM, 0.2UM, 0.25UM, 0.5UM, 1UM (precision instruments, LED lighting);
‌Medium and high current‌ (>1UM): 2UM, 3UM, 5UM, 10UM, 15UM, 20UM, 30UM (power supply equipment, motor);

‌Fusing characteristics‌ ‌Fast-break type (F type): Resposta rápida, suitable for sensitive electronic equipment (marked such as F1A, F5A). ‌
‌Slow-break type (T type): Resistant to instantaneous current shock, suitable for motors and transformers (marked such as T2A, T10A). ‌

5 * 20mm Axial Glass fuse tube Fast Blow 250V With Lead Wire 0.5A/1A/2A/3A/3.15A/4A/5A/6.3A/8A/10A/12A/15A

5 * 20mm Axial Glass Fuse Quick Fast Break 250V with Lead Wire 0.5A-25A

520S-250mA .25A 250V Slow Blow 5 x 20 Cartridge Fuse

Ii. Key parameters and certifications ‌

Electrical performance‌ ‌Breaking capacity‌: 35A@250V (low current model) to 200A@250V (high current model), ensuring safe disconnection in case of short circuit. ‌
‌Temperature adaptability‌: Working temperature ‌-55℃~125℃‌, passed the hot and cold shock test (-40℃~90℃ cycle). ‌

‌Safety certification‌
Mainstream products have passed ‌UL, CSA, CCC, VDE, RoHS‌ certification and meet international safety standards. ‌

🛠️ III. Application scenarios and accessories ‌Typical applications‌
APLAÇÕES DESHOND APLICAÇÕES‌: power adapter, small appliance circuit board (commonly used 1A~5A). ‌
‌Industrial equipment‌: servo drive, power module (commonly used 10A~30A). ‌
‌Outdoor equipment‌: waterproof fuse holder (IP67 grade) for street lights and vehicle-mounted equipment. ‌

‌Matching fuse holder‌
‌PCB installation type‌: straight leg/bent leg design (such as PTF-77), supporting 10A~20A current. ‌
‌Waterproof lead type‌: with PVC sheath and nickel-plated brass terminals (such as H3-520E), suitable for harsh environments. ‌

💡 IV. Purchase recommendations ‌Current matching‌
Select according to 1.5 times the maximum operating current of the circuit (por exemplo: the maximum current of the circuit is 2A → select a 3A fuse). ‌
‌Motor type‌: Prefer slow-break type (T) to avoid false fuse at startup. ‌Digital circuit‌: Select fast-break type (F) to enhance overcurrent response. ‌
‌Certification and reliability‌
Confirm that the product has the ‌UL/CCC‌ mark to avoid uncertified brands (high safety risks). ‌

‌Purchase channels‌
Bulk purchase: Yaxun Electronics’ 1688 platform ($0.02/piece, 100 pieces minimum) ‌
Retail replacement: Yaxun Electronics’ JD/Tmall (sobre $0.5 para 10 pieces). ‌

💎 Summary
5*20 fuse is the basic protection component of electronic circuits. The selection needs to be based on current demand, fusing characteristics and environmental conditions. Give priority to brand products with complete certifications (such as Litte and Huade), and match them with corresponding fuse holders to ensure stable installation. ‌ For industrial or outdoor scenes, be sure to choose waterproof and high temperature resistant models to ensure long-term reliability.