As an important brand in the field of electronic circuit protection, Gongde fuses have a rich product line, which can be mainly divided into the following core categories, with clear logic as follows:
Classified by protection form and reset characteristics:
Characteristic: When overcurrent (overload or short circuit) occurs in the circuit, the melt melts and cuts off the circuit, providing reliable protection. After troubleshooting, the fuse must be manually replaced to restore circuit functionality. This is the most traditional and widely used type.
Gongde's typical product series: covering various packaging forms from plugins to surface mount (such as FST, FSF, FSP, SMD series, etc.).
Recoverable fuse:
PPTC: Gongde provides a variety of high polymer positive temperature coefficient fuses.
Characteristic: In case of overcurrent, its resistance will sharply increase ("trip"), thereby limiting the current and protecting the circuit. After troubleshooting and power off cooling, it can automatically reset and return to a normal low resistance state without the need for replacement. Especially suitable for situations where temporary malfunctions may occur or where frequent maintenance and replacement need to be avoided.
Gongde's typical product series includes RGE, RUE, RUS, RHS, and other series, providing options for different sizes, current and voltage specifications, and operating characteristics.
Attention: Currently, Gongde mainly provides PPTC type recoverable fuses.
Divided by installation method and packaging form:
Plug in fuse:
Characteristic: It needs to be inserted into the through-hole solder pad or fuse holder on the circuit board for installation.
Main types:
Tubular fuses: The most common are packaged in glass or ceramic tubes, such as 5x20mm and 6.3x32mm. Gongde has an extremely rich product line of this type, covering features such as fast break, slow break, ultra slow break, high surge resistance, and high breaking capacity (such as FST, FSF, FSP, FSH, FSE series, etc.).
Radial lead/SMT plug-in: such as SMD type with lead, or miniaturized plug-in packaging (such as the Gongde FPC series).
Surface mounted fuses:
Features: Directly mounted on the surface of the circuit board, suitable for modern automation production and miniaturization trends.
Main types:
SMD Chip Fuse: Standard chip packaging, such as 1206, 0603, 0402, and other sizes. Gongde provides a variety of current, voltage, and breaking capacity options (such as SMD, MHP, MHS, MHT, MPR series, etc.).
SMD thin film fuse: usually used in ultra small packages (such as 0402, 0201) or in situations where precise and fast protection is required, the melt is a thin film structure (such as MPR, MPT series).
SMD PPTC: A patch packaging form for recoverable fuses (such as RUE, RUS series).
Classified by melting characteristics/time current characteristics:
Quick break type:
Characteristics: It responds very quickly to overload and short-circuit currents and can melt in a very short time. Suitable for protecting semiconductor devices that are highly sensitive to overcurrent or for situations where rapid interruption of fault current is required (such as secondary side output protection).
Gongde identification/series: usually represented by F (Fast Acting), such as FSTF, SMDF, etc.
Slow break/delay type:
Characteristics: Able to withstand brief surge currents (such as input capacitor charging current of switch mode power supply, motor starting current) without melting, but still provides protection against continuous overload or short circuit. On the time current curve, the time required for melting is longer than that of fast breaking type.
Gongde identification/series: usually represented by T (Time Lag, Slow Blow), such as FSTT, SMDT, etc. Gongde also offers TT (Super Time Lag) type with stronger surge resistance (such as FSTTT).
Medium speed break type:
Features: The melting speed is between fast and slow, providing a compromise protection feature.
Gongde identification/series: sometimes represented by M (Medium), but not as common as F/T. Please refer to the specification sheet for specific details.
Classified by application field or special performance:
Universal fuse: meets the general circuit protection requirements.
High breaking capacity fuse:
Features: It can safely break extremely high short-circuit currents (usually up to several thousand amperes or even higher), preventing the danger of arcing, splashing, or explosion during breaking. Suitable for high-energy circuits such as power input stages and industrial equipment.
Typical series of Gong De: HS/HP (High Breaking Capacity) series (such as FSH, SMDHS, MHP, MHS). Ceramic tube fuses usually have high breaking capacity.
High surge resistant fuse:
Features: It particularly enhances the ability to withstand repetitive surge currents while still providing protection against sustained overloads. It is a high-performance category in slow break fuses.
Typical series of achievements: SE/S (Surge Withstanding) series (such as FSE, SMDS).
Micro/ultra small fuses: meet the needs of highly miniaturized electronic products, especially surface mount packaging (such as 0402, 0201).
Semiconductor protection dedicated fuse:
Characteristics: It usually has extremely fast melting speed, low I ² t value, and high breaking capacity, specially designed to protect power semiconductor devices such as IGBT, MOSFET, SCR from short circuit damage.
Gongde Typical Series: There are specialized fast break and high break series, and some MHP, MHS, and MHT series products are suitable for such applications and require specific selection.
Automotive grade fuses:
Features: Compliant with automotive electronic reliability standards (such as AECQ200), with a wider operating temperature range, stronger resistance to vibration and impact, and longer service life.
Gongde Typical Series: Gongde has a product line developed for automotive applications (such as some SMD, MHP, MHS series that comply with AECQ200).
Summary and selection key points:
The core classification dimensions of Gongde fuses are: 1) whether they are recoverable; 2) Installation method; 3) Circuit breaking speed; 4) Special performance requirements. In actual selection, the following key parameters must be comprehensively considered:
Rated current: The normal operating current of the circuit.
Rated voltage: The operating voltage of a circuit and the maximum voltage that may occur.
Breaking capacity: The maximum expected short-circuit current that may occur in a circuit.
Fuse characteristics: Choose fast break, slow break, etc. based on the load characteristics (whether there is surge).
Size/packaging: meet the requirements of circuit board space and installation method.
Certification requirements: such as UL, cUL, TUV, AECQ200, etc.
Environmental requirements: working temperature range, humidity, etc.
By using the product filters or detailed specifications on the official website of Gongde, combined with the above classification and parameters, the most suitable Gongde fuse for application needs can be accurately selected.