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Why Choose GFEFUSE?
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Founded in 2013 in Dongguan, Guangdong, our company is a professional manufacturer ofelectronic protection devices. For years, we have been focusing on the protection device field, withan integrated team for development, production and sales, committed to providing customers withproducts of perfect performance and reliability.
Dur moin products include, fuses, fuse ho ders, fuse boxes, outomotive fuses, gutomotive fuse holders, Dcfuses, high-voltage fuses, new energy fuses ond other peripherol occessories, These products ore widelyused in multiple fields such os consumer electronics, outomotive electronics, power equipment,communicotion systems ond new energy. Aiming ot stoble performonce ond reliobility, our products hove notonly guickly won recognition in the domestic morket but olso been exported overseos, enjoying wide morketpopulority.
As 0 competitive compony in the protection device industry, we hove been committed to technologicol R&Dinvestment, quipped with 0 professionol R&D teom, we continuously promote product innovotion to ensureour wide product coveroge ond occelerote morket opplicotion speed of our products.
We olways toke quolity os our core goal and strive to be customer-oriented. Our products hove obtoined UL
cULus, Tuv, CE, COC ond other product certificotions, ond ore in complionce with ROHS ond REACH directives.
Having spent the better part of 12 years in the protection industry, I can tell you that the laws of physics are unforgiving in power electronics. A standard industrial fuse operates in milliseconds. A semiconductor dies in microseconds. That incredible difference in speed is the entire reason the high speed fuse exists. It operates in a time domain that is almost incomprehensible. Its job is to detect a catastrophic short circuit and open the circuit so fast that it limits the peak current from ever reaching its full potential. It's not just opening the circuit; it's actively choking off the fault before it can draw its first full breath.
The engineering that goes into a GFEFUSE high speed fuse is a world apart from standard fuse technology. The element is not a simple wire; it's a meticulously designed piece of pure silver, often with multiple constrictions or "notches." These are precisely calculated weak points designed to vaporize at a specific current level, creating multiple arcs within the fuse body simultaneously. This multi-arc approach dramatically increases the internal resistance and voltage, forcing the fault current down with incredible speed. It’s this sophisticated design, not just the material, that makes a high speed fuse so incredibly fast.
The most critical concept I teach our clients is I²t, or "let-through energy." A semiconductor doesn't care about amps alone; it dies from thermal energy. The entire selection process for a high speed fuse is a race: the fuse's clearing I²t must be lower than the semiconductor's I²t withstand rating. If it is, the fuse wins, and the multi-thousand-dollar IGBT module lives. If it's not, the fuse loses, and the drive is destroyed. Our entire R&D process at GFEFUSE is an obsessive quest to minimize the clearing I²t of our fuses, giving our clients the greatest possible margin of safety for their valuable equipment.
From massive VFDs controlling factory-sized motors to the delicate inverters at the heart of the renewable energy grid, the high speed fuse is the silent, unassuming hero. It makes modern, efficient power conversion possible by providing a level of protection that was once unimaginable. It is a component that lives its entire life waiting for a single, catastrophic microsecond where it is called upon to make the ultimate, instantaneous sacrifice. It's a profound responsibility, and at GFEFUSE, we build every single high speed fuse to be worthy of that trust.
Featured Products
Collection about GFEFUSE
GFEFUSE North American Semiconductor Fuse | UL 248-13 Fast DC Fuse for High-Voltage Systems
GFEFUSE North American semiconductor fuse offers low arc voltage, ultra-low I²t & UL248.13/IEC60269.4 approval for efficient high-voltage DC protection in energy storage, UPS and EV applications.
GFEFUSE Photovoltaic Fuse – 1500 V DC UL-248-19 Full-Range PV Protection
GFEFUSE Photovoltaic fuse offers low I²t, strong current-limiting and UL-248-19 / IEC 60269-1/6 compliance for safe 1500 V PV inverters, combiner boxes and faulted-string protection.
GFEFUSE Energy Storage Fuses – 1500 V DC 50-200 A High-Speed Square Body | 100 kA Breaking Capacity
GFEFUSE Energy Storage Fuses deliver 1500 Vdc, 50-200 A protection up to 100 kA breaking capacity for battery packs, BESS, PCS and other DC circuits. UL & IEC compliant, fast-acting, square body design.
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Frequently Asked Question
Do you have any question?
GFEFUSE is a trusted expert because we specialize in the advanced material science and precision engineering required for these components. We design every high speed fuse with pure silver elements and advanced arc-quenching techniques to guarantee extremely low I²t values and consistent, reliable performance, all validated by rigorous testing and global certifications.
Yes. Common styles include the large "square body" or "cube body" high speed fuse, which is common in high-power industrial equipment. Other styles include bolted-tag (blade style) and ferrule (cartridge style) bodies for different mounting requirements and current ratings.
These are IEC fuse classes that define the operating characteristics. "aR" class fuses provide extremely fast, short-circuit protection only (partial range). "gR" and "gS" class fuses also provide extremely fast short-circuit protection but are full-range devices, meaning they also protect against lower-level overload currents. The choice depends on the specific protection needs of the circuit.
I²t (pronounced "I squared t") represents the thermal energy of a fault current. The fuse's clearing I²t value must be lower than the semiconductor's withstand I²t rating. This is the most critical coordination parameter: it ensures that the high speed fuse will absorb the destructive energy and blow before the semiconductor it is protecting is damaged.
Variable Frequency Drives (VFDs), inverters, and solid-state rectifiers use semiconductor devices (like IGBTs) that have very little thermal mass and can be destroyed by overcurrent in less than a millisecond. A high speed fuse is the only type of protective device fast enough to interrupt the fault current before it can damage these critical components.
A high speed fuse, also known as a semiconductor fuse, is an ultra-fast-acting fuse designed to protect sensitive power electronic devices. It differs from a standard fuse by having an extremely low I²t value, meaning it opens the circuit in microseconds during a major fault, limiting the total destructive energy let-through to protect the semiconductor.
Our updates and blog posts
Square high speed fuse: The Ultimate 1500 V DC Guardian for Energy Storage & EV Systems
Discover how the Square high speed fuse from GFEFUSE delivers 1500 V DC, 100 kA protection for BESS, EV chargers and wind converters. UL & IEC approved, low I²t design.
North Americansemiconductor fuse: The 1000 V DC Fast-Acting Shield EV & BESS Engineers Trust
Discover GFEFUSE North Americansemiconductor fuse—1000 V DC, 50 kA, UL & IEC approved. Ideal for EV chargers, BESS, PV inverters. Low I²t, high cycling life.
Photovoltaic fuse: The 1500 V DC Guardian Every Solar Array Needs
Discover GFEFUSE Photovoltaic fuse—1500 V DC, 1–30 A, 50 kA, UL-248-19 & IEC 60269-1/6 approved. Ideal for string and combiner boxes. Low I²t, high cycling life.