Dongguan Reomax Electronic Components Co., Ltd.

Basic knowledge of current fuse application

reomaxfusesguanliyuan — Thu, 31 Oct 2024 03:59:01 +0000

The functions of fuses: 1. Under normal circumstances, fuses play the role of connecting circuits in circuits. 2. Under abnormal (overload) conditions, the fuse acts as a safety protection element in the circuit and safely cuts off and protects the circuit by fusing itself. 2. Working principle of current fuse: When the fuse is energized, the heat converted by electrical energy causes the temperature of the fusible body to rise. When the normal operating current or the allowed overload current passes, the heat generated radiates to the surrounding environment through the fusible body and the outer shell, and the heat dissipated through convection, conduction, etc. gradually reaches a balance with the generated heat. If the heat generated is greater than the heat dissipated, the excess heat will gradually accumulate on the fusible body, causing the temperature of the fusible body to rise; when the temperature reaches and exceeds the melting point of the fusible body, the fusible body will melt and fuse. Cutting off the current plays the role of safety protection circuit. 3. Classification of current fuses: 1. According to the appearance size, they are divided into: φ2, φ3, φ4, φ5, φ6 and others. 2. According to the fusing characteristics, it is divided into: fast fusing type, medium delay fusing type, and delayed fusing type. (It can also be divided into express and strong delay). 3. According to the breaking capacity, it is divided into: low breaking type, high breaking type (can also be divided into enhanced breaking type). 4. According to safety standards (or regions of use), they are divided into: UL/cUL (North America) specifications, IEC (China, Europe, etc.) specifications, MIT/KTL (Japan/South Korea) specifications, etc. In many electronic devices, fuses (FUSE) are indispensable. Since Edison invented the first plug-type fuse in the 1890s, which enclosed a thin wire in a desk lamp holder, there have been more and more types of fuses and their applications have become more and more widespread. Here are some fuse parameters, selection and application common sense. The ratings and performance indicators of the fuse are determined based on laboratory conditions and acceptance specifications. There are many authoritative testing and appraisal organizations in the world, such as UL certification of Underwriters Laboratories in the United States, cUL certification of Canadian Standards Association, MTTI certification of Japan’s Ministry of International Trade and Industry, and ICE certification of International Electrotechnical Commission. 1 The selection of fuse involves factors a. Normal operating current. b.Applied voltage applied to the fuse. c. Abnormal current requiring the fuse to be disconnected. d. The minimum and maximum time allowed for abnormal current to exist. e. Ambient temperature of the fuse. f. Pulse, inrush current, surge current, starting current and circuit transient value. g. Are there any special requirements beyond the fuse specifications? h. Dimensional limitations of the installation structure. i. Required certification body. j. Fuse holder:

Common sensor shapes of NTC temperature sensors

reomaxfusesguanliyuan — Thu, 31 Oct 2024 03:31:48 +0000

NTC (negative temperature coefficient) thermistor is a heat-sensitive semiconductor resistor. Its resistance value decreases as the temperature increases. The temperature coefficient of resistance is in the range of -2%/k~-6%/k, which is about that of metal. 10 times the temperature coefficient of resistance. The change in the resistance value of the NTC thermistor can be caused by changes in the external ambient temperature, or it can be caused by the flow of current and self-heating. His various uses are based on this property. NTC thermistors are constructed from polycrystalline ceramics with mixed oxides. The conductive mechanism of this material is quite complex. It is an early professional manufacturer of NTC thermistors in China. The NTC thermistors produced by the company are widely used in various handheld devices and miniaturized electronic equipment, and are also widely used in various Various temperature measurement and temperature compensation occasions, relying on the technical advantages in the field of thermistors, produce temperature sensor products with stable performance and reasonable price. The products are widely used in military, medical, human life, industrial automation, automobiles, security and fire protection, and home appliances. , communications and other fields and occasions that require temperature measurement or overheating protection. NTC temperature sensors are usually composed of 2 or 3 metal oxides, mixed in a popular clay, and sintered into a dense sintered ceramic in a high-temperature furnace. Oxygen-bonded metals tend to donate free electrons. Ceramics are generally excellent insulators. But this is only theoretically the case with thermistor-type ceramics when the temperature is close to absolute zero. However, as the temperature increases to more common ranges, thermal excitations throw out more and more free electrons. As many electrons carry current through the ceramic, the effective resistance decreases. Resistance changes extremely sensitively with temperature. Typical changes are (-)7[%] to 3[%] reduction per degree Celsius. This is the most sensitive of any sensor suitable for use over a wide temperature range. The rated room temperature resistance depends on the resistivity, size and geometry of the base material, and the contact area of the electrodes. A thermistor that is thick and narrow has a relatively high resistance, while a thermistor that is thin and wide has a lower resistance. Actual sizes are also very flexible, they can be as small as .010 inches or very small in diameter. There is almost no limit to the maximum size, but half an inch or less usually applies. The structure of the temperature sensor: NTC thermistor, probe assembly (combination). A finished thermistor assembly (combination) composed of a thermistor shell, extension lead, and sometimes a joint. The structure generally consists of an NTC thermistor, a probe (metal shell or plastic shell, etc.), an extension lead, and a metal terminal or connector. The principle is that under a certain measurement power, the resistance value of the NTC thermistor increases rapidly as the temperature rises. Decrease. Using this characteristic, the NTC thermistor can be used to determine the corresponding temperature by measuring its resistance value, thereby achieving the purpose of detecting and controlling temperature. Applications ● Air conditioners, refrigerators, freezers, water heaters, water dispensers, heaters, and washing machines. Dish machines, disinfection cabinets, washing machines, dryers and other home appliances. ● Car air conditioners, water temperature sensors, air intake temperature sensors, engines ● Switching power supplies, UPS uninterruptible power supplies, inverters, electricity

Congratulations to our company for obtaining VDE certification for SET series chip fuses

reomaxfusesguanliyuan — Thu, 31 Oct 2024 03:13:22 +0000

Congratulations to our company for the VDE certification number of SET series chip fuses: 40050560 SET series 500mA 1A 2A 3.15A (square fuse, 2410/1808/6125) REOMAX/Reimai fuse manufacturing has passed the national consultation hotline 13798531548/15338017943

Korea KC certification Ruimai obtained 6125 2410 1808 chip fuse KC certification 0.5A 1A 3a 3.15a 5A

reomaxfusesguanliyuan — Thu, 31 Oct 2024 02:30:24 +0000

Congratulations on our set series patch fuse Korean KC certification No.:

Reomax obtained 6125 2410 1808 chip fuse KC certification certificate No.: su05052-19001 su05052-19001 KC certification 0.5A 1A 2A 3a 3.15a 5A 6.3A 7a (square fuse, 2410 / 1808 / 6125) reomax / rimac fuse was manufactured through the national consultation hotline 13798531548 / 15338017943

UL certified R1032 R1245 4512 large chip fuse 30A 40A 50A 60A 80A 100A

admin — Sun, 20 Oct 2024 04:32:10 +0000

UL certified R1032 R1245 4512 large chip fuse 30A 40A 50A 60A 80A 100A chip fuse square fuse, 2410/1808/6125REOMAX/Reimai fuse manufacturing through the national consultation hotline 13798531548/15338017943