In various electronic and electrical devices, fuses are essential basic protective components. According to the IEC127 standard, a fuse is officially defined as a "fuse-link". When abnormal conditions such as overload, short circuit, or component failure occur in a circuit, the fuse quickly melts and cuts off the power supply circuit, ensuring the stability of electronic devices and circuit systems.
Main Classification Methods of Fuses
According to product functions and structural characteristics, fuses are mainly divided into three categories: current fuses, temperature fuses, and resettable fuses.
1. Current Fuse | General Protection for Overload and Short Circuit
Current fuses are the most widely used one-time protective components. Their core function is to monitor circuit current, and when the current exceeds the limit due to overload or short circuit, the fuse element quickly melts and cuts off the circuit. Based on packaging form and application scenarios, they can be divided into four main categories: Surface Mount Fuses, Miniature Fuses, Blade Fuses, and Tubular Fuses.
① Surface Mount Fuse
Main specifications include 0805, 1206, 2512, etc., manufactured using precision thin-film technology, with accurate electrical parameters and high consistency. They are mostly used in portable devices, smart instruments, and small digital products, and are also one of the core product categories of Lu Hai and Hua De brands.
② Blade Fuse
Also known as a fork plug fuse, it has a solid structure, easy plugging and unplugging, and simple replacement. It has excellent vibration resistance and is mainly used in automotive electronic devices. It is also used in some industrial mobile electrical equipment, and is frequently used in car circuit protection.
③ Tubular Fuse
It comes in two structures: glass tube and ceramic tube. It is the most common type of fuse in the market, with a simple structure, high cost-effectiveness, and strong versatility. It is widely used in multimeters, various household appliances, switch power supplies, and industrial control power supplies. Hua De Electronic tubular fuses have become the mainstream choice in this category due to their stable performance.
2. Temperature Fuse | Specialized Protection Against Overtemperature
Temperature fuses are one-time, non-recoverable thermal-sensitive protective components. Their core function is to monitor the working temperature of circuits and devices. When the device overheats and the temperature exceeds the rated threshold, it automatically melts and cuts off the power. These products have good sealing, precise action temperature, resistance to current impact, and vibration resistance. They are mainly divided into three series, with both Liang Sheng and Hua De having product lines:
① RH Square-shaped Temperature Fuse: Uses a plastic square housing structure and low-melting-point alloy material. It has a compact structure and is easy to install, suitable for various small and medium-sized home appliances.
② RP Resistance-type Temperature Fuse: Relies on low-melting-point alloy core material, with sensitive temperature sensing and stable operation, suitable for conventional temperature control protection scenarios.
③ RY Metal Cased Temperature Fuse: Features a metal casing with an organic heat-sensitive body, offering excellent sealing and reliable protection performance. It is resistant to high temperatures and aging, and is commonly used in electric rice cookers, hair dryers, motors, and high-power home appliances that operate at high temperatures.
3. Resettable Fuse | Recyclable Protective Device
A resettable fuse (PPTC) is a reusable intelligent protective component, different from traditional one-time fuses, which does not require replacement. Under normal operation, it is in a low-resistance conducting state. When the circuit experiences overload or overcurrent, the device rapidly heats up to a high-resistance state, cutting off the circuit. Once the fault is resolved and the temperature drops, it automatically restores the conductive state, achieving cycle protection.
This category primarily focuses on low-voltage, small-current overload protection, suitable for various low-voltage load circuits, significantly reducing equipment maintenance costs. It mainly comes in three package types: plug-in, stacked, and surface mount:
Resettable Plug-in Fuse
Stacked Resettable Fuse
Surface Mount Resettable Fuse
Final Words
Current fuses, temperature fuses, and resettable fuses each serve their own purposes, corresponding to different fault scenarios such as circuit overcurrent, equipment overtemperature, and sustained overload, covering the majority of the protective needs of electronic and electrical devices.
With the official authorization of three major original manufacturers, Hua De, Lu Hai, and Liang Sheng, Shunhai Technology can provide a full range of genuine fuse products with complete specifications, combined with original factory technical support, on-site inventory, and free sample testing, providing one-stop services to accurately match protection solutions in various fields.
