What are the commonly used fast fuse models?
XRNT fast fuse
The main features of XRNT fast fuses are
1. High breaking capacity, breaking current up to 63KV.
2. Low power consumption and low temperature rise.
3. action particularly fast, safe one second characteristic of the current domestic production of similar products in action faster than, for example, the fuse rated current of 100A, 1000A expected to pass current, arcing time does not exceed 0.1S.
4. The characteristic error of the second is less than ±10%.
5. It is equipped with a spring type impactor, which has the characteristics of large contact surface and small pressure. Therefore, when the switch interlocking action is pushed, there is no occurrence of breakage or breakdown of the contact surface of the switch and the striker. .
6. Product performance in line with GB15166.2 national standards and IEC60282-1 international standards.
7 can be reliably breaking the minimum breaking current to the rated breaking current between the fault current, safer to use. So this is the type of fast-acting fuses industrial fuses the best choice.
RT14-20 Fast Fuse
Fast fuse special configuration of this type, which is composed of two parts fuse and the fuse base composition, the melt fuse variable section made of pure copper sheet enclosed in melting tube made of a high-strength porcelain, the melt tube is filled with chemically treated high-purity silica sand as an arc extinguishing medium, and the second end of the end cap melt secure electrical connection, and both sides of the fuse are run in contact with the copper, commonly known as a double cover, consisting of a cylindrical cap-shaped configuration . The fuse base is made of resin or plastic pressed housing with contacts and load carrying parts, or riveted connection, which can be used as a support for the corresponding size fuse. Therefore, this type of fast-blow fuse has the characteristics of small size, convenient installation, safe use and beautiful appearance, and has been welcomed by the majority of users.
SP10M10 fast fuse
The SP10M10 fast-blow fuse has the following features:
1. SP10M10 fast fuse has a very wide operating temperature range, the upper limit can reach 90 ° C, and the lower limit can reach -50 ° C.
2. Has good breaking ability, the maximum breaking capacity reaches 35KA, and the breaking time constant is 1-3ms.
3. Excellent fusing characteristics: SP series DC fuses are blown within 1 hour when the actual working current reaches 1.13 times of the rated current; when the actual current reaches 1.45 times of the rated current, it is blown within one hour. This feature is especially suitable for the changing output current of photovoltaic power plant panels.
4. With ultra-low contact resistance, the two-head contact cap of SP10M10 fast-acting fuse adopts Japanese NGK beryllium copper, which has the characteristics of high strength, high electrical conductivity, fatigue resistance, high thermal conductivity and corrosion resistance.
Fast fuse common types
Plug-in fuse: It is commonly used at the end of lines with voltage ratings of 380V and below, as short-circuit protection for distribution lines or electrical equipment. Spiral fuse: The upper end cap on the melt has a fuse indicator. Once the melt blows, the indicator pops up immediately and can be seen through the glass hole in the porcelain cap. It is commonly used in machine tool electrical control equipment.
Spiral fuse. It has a large breaking current and can be used for short-circuit protection in circuits with voltage levels of 500V and below and current levels below 200A.
Enclosed fuses: Closed fuses are divided into two types: filler fuses and non-filled fuses. Packed fuses are generally made of square ceramic tubes with built-in quartz sand and melt. They have strong breaking capacity and are used for voltage levels below 500V. In circuits with current levels below 1KA. The non-filled sealed fuses are used to load the melt into a closed cylinder with a slightly smaller breaking capacity for use in power grids or power distribution equipment below 500V and below 600A.
Fast-acting fuses: Fast-blowers are mainly used for short-circuit protection of semiconductor rectifying components or rectifiers. Due to the low overload capability of semiconductor components. It can only withstand large overload currents in a very short time, so short circuit protection is required to have a fast blown capability. The structure of the quick-blow fuse is basically the same as that of the filled-closed fuse, but the melt material and shape are different, and it is a variable-section melt with a V-shaped deep groove punched by a silver sheet.
Self-resetting fuse: using sodium metal as the melt, it has high conductivity at normal temperature. When a short-circuit fault occurs in the circuit, the short-circuit current generates a high temperature to rapidly vaporize the sodium, and the vaporous sodium exhibits a high-resistance state, thereby limiting the short-circuit current. When the short-circuit current disappears, the temperature drops and the metal sodium returns to its original good electrical conductivity. Self-resetting fuses can only limit the short-circuit current and cannot really break the circuit. The advantage is that the melt does not have to be replaced and can be reused.
Precautions
Due to its excellent short-circuit protection performance, the fuse is widely used in high and low voltage power distribution systems and control systems as well as in electrical equipment. As a protector for short-circuit and over-current, it is one of the most common and important protection devices. In the application, we must pay attention to the use of fuses, daily inspections and maintenance. Fuse use precautions:
1. The protection characteristics of the fuse should be compatible with the overload characteristics of the protected object. Considering the short-circuit current that may occur, the fuse with the corresponding breaking capacity is selected.
2. The rated voltage of the fuse should be adapted to the line voltage level, and the rated current of the fuse should be greater than or equal to the rated current of the melt.
3. The rated current of the fuses of all levels of fuses in the line should be matched accordingly, and the rated current of the first stage melt must be greater than the rated current of the next stage.
4. The melt of the fuse should be used with the matching melt as required. It is not allowed to increase the melt arbitrarily or replace the melt with other conductors.
Fuse inspection inspection:
1. Check that the fuse and melt ratings match the protected equipment.
2. Check the appearance of the fuse for damage or deformation, and whether there is any flashing discharge mark on the porcelain insulation part.
3. Check whether the contact points of the fuse are in good condition, the contact is tight, and there is no overheating.
4. Is the fuse signal indicator of the fuse normal?
Fuse maintenance:
1. When the melt is blown, the cause of the fuse must be carefully analyzed. The possible causes are: 1) short-circuit fault or overload operation and normal fuse; 2) the melt is used for too long, and the melt is subjected to oxidation or high temperature during operation. The melt characteristics are changed and mistakenly broken; 3) There is mechanical damage during the melt installation, so that the cross-sectional area becomes small and causes a break in operation.
2. When disassembling the melt, it is required to: 1) Before installing the new melt, find out the cause of the melt blow, determine the cause of the fuse, do not replace the melt test; 2) When replacing the new melt, Check that the melt rating matches the equipment to be protected; 3) When replacing the new melt, check the internal burn of the fuse tube. If there is severe burn, replace the melt tube at the same time. When the porcelain melt pipe is damaged, it is not allowed to replace it with other material pipes. When filling the fuse with a filler fuse, pay attention to filling the packing.
3. The fuse should be repaired at the same time as the power distribution device: 1) clean the dust and check the contact point contact; 2) check the appearance of the fuse (remove the fuse tube) for damage, deformation, and whether the porcelain is flashing or not. Traces; 3) Check fuses, whether the melt is matched with the circuit or equipment to be protected, and investigate if there is any problem; 4) Pay attention to check the N line in the TN grounding system, the grounding protection line of the equipment, and do not allow the fuse to be used. 5) When maintaining and inspecting the fuse, the power supply must be cut off according to the safety regulations. It is not allowed to take the fuse tube with power.
In fact, because the type of fast-blow fuse is too much, if it is not because of special requirements for the circuit, in general, the various types of quick-blow fuses are not very different, because their functions are similar. When the circuit is short-circuited and the melt is instantaneously blown to break the circuit, the fast-acting fuse can act as a short-circuit protection. Therefore, when purchasing a fast-blow fuse, you can look at a few more models, and you can buy the most cost-effective fast-acting fuse to the maximum extent. The above is the relevant content of the fast fuse model, I hope to help everyone!
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