Chim vіd_znyaєtsya zapobіzhnik vіd melting insert. What are the best additions: swimming trunks or automatic vimikachi? Marking of fusible guards
Melting inserts are made from midi, zinc, lead or silver.
the most thorough modern zapobіzhniks give priority to the middle inserts from the tin retailer. Widely expanded and zinc inserts.
Medium inserts for the most comfortable, simple and cheap. Polypshennya їх characteristics reach surfacing tin bag
singing space, approximately in the middle of the insert. Such inserts zastosovuetsya, for example, in the guessing series of thick guards PN2. Tin is melted at a normal temperature of 232 °, significantly lower, lower melting temperature of midi, and varying the mid of the insertion of the metal dot with it. The arc, which appears at the same time, already melts the entire insert and is extinguished. Lansyug struma is turned on.
In this rank, fusing tin bags to lead to the step.
First, mid-inserts begin to react at a late hour to such a small vanity, but they didn’t react to the stench of the retailer’s presence. For example, a medium-sized drill with a diameter of 0.25 mm with a retailer melted at a temperature of 280 ° for 120 minutes.
School for an electrician: statistics, reasons, basic information
In another way, at one and the same time to reach a great temperature (that is, with the same pressure), inserts with a retailer react richer, lower inserts without a retailer.
For example, a medium drill with a diameter of 0.25 mm without an opener at an average temperature of 1000 ° melted in 120 minutes, and the same drill, but with an opener at an average temperature of only 650 °, melted in a total of 4 min.
Застосування олов'яного розчинника дозволяє мати надійні та дешеві мідні вставки, що працюють при порівняно низькій експлуатаційній температурі, що мають відносно малий об'єм і вагу металу (що сприяє комутаційній здатності запобіжника) і водночас володіють великою швидкодією при великих перевантаженнях та реагують з витримкою time for a little adventure.
Zinc is often vicorated in the preparation of fusible inserts. Zocrema, so the inserts will stop at the guessing series of zapobіzhniks PR-2.
Zinc inserts are more resistant against corrosion. Therefore, regardless of the apparently low melting temperature, for them, apparently, it would be possible to allow the same limiting operational temperature, as for midi (250 °), and design inserts with a smaller peretina. However, the electrical support for zinc is approximately 3.4 times greater, lower for midi.
To save the same temperature, you need to change the amount of energy spent in it, obviously increasing the temperature. The insert comes out signifi- cantly massive. For other equal minds, bring down the commutation property of the zapobіzhnik to a reduction. In addition, with a massive insert with a temperature of 250 °, it would not be possible to reduce the temperature of the cartridge and contacts at the same dimensions at an acceptable level.
All zemushuє reduce the boundary temperature of zinc inserts to 200 °, and for this even more increase the span of the insert. As a result, zapobіzhniks with zinc inserts, with the same roses, may have significantly less stamina to a short streak, lower zapobіzhniks with medium inserts and tin rozchinniks.
School for an electrician: statistics, reasons, basic information
–the element of an electric lansyug, the main recognition of which is zahist yogo vіd poshkodzhennya.
Principle dії
Zapobіzhnik vlastovaniya such a rank that burns earlier, lower ears are cherished by other elements. And it’s easier to insert a new guard, lower the darts, microcircuits and other elements, which can burn when cutting the struma in the lance.
A fusible zapobіzhnik is called the one that is based on a fusible insert. This melting insert is made up of an alloy, which can have a low melting point and, when a struma is not safe for a lancet, the amount of heat that is seen when such a struma passes through this insert is sufficient to melt it. If the insert melts - "burns out", then the lancet appears to be rozіknutim.
The reasons for the burnout of the bud can be a short flicker, overwhelm and a sharp haircut of the strum.
Not only that, but the guardian guards the lance from the fire, so it serves as a defense against fire and spallah, so the melting insert burns out in the body of the guard, on the guard against the dart, which can hang around the moment of burning with combustible materials.
Trapleyetsya so that people prepare so titles bug. Ring out the splendid shmachok of the dart, which is inserted as a substitute for the zapobіzhnik. To shy away from the one who is under the hand of a mute, the defender of the required denomination, or by the method of bypassing the zakhist. Most often, such bugs are produced until they burn, it’s impossible to burn out such a bug for some kind of strum and burn out in a flash.
Priya zapobіzhnik
As it was said above, the simplest fusible fuse is made up of the main part - a fusible insert (drіt) 
that body, which is intended for connection with an electric lance and a service for insertion.
Advantages and shortcomings
Before the fusible zapobіzhniks are overwhelmed, it is possible to carry a remarkably low varіst.
The main shortfall of the fusible protector is three times spratsovuvannya with automatic protectors. For an hour of burnout, the guard at high-voltage wires can be put out of operation. In addition, the fusible zapobіzhnik is a disposable element, which, once burned, does not succumb to the farthest vino, at that hour, as automatic zapobіzhniki can serve for a long time, the principle of their robotic foundations on the rozmikanny lance without the poor design of the zapkobіzhіzh.
Main parameters
Parameters that characterize the fusible protector are the nominal jet value, the nominal voltage, the tension, the speed of operation.
De U- voltage in the measure, and Pmax– the maximum tension of vanishing with a margin of close to 20%.
Shvidk_st spratsovuvannya fusible zapobіzhnikіv rіzna. For the way, at the schemes, de Napivprivprikovsky, the jacket is more than the jackhole, the shvidsha, the shelter of the arrogant, the plane -hacks, the vicoristovye in the Lantsyuhu Elektrodviguna, then the zaidoi najikh, the yakscho no boodi is not Budai Laishegi Lyzhegi Lyzhegi Lyozhoi Lyzhegi Lyzheygi . .
Aparati zahistu Designed for the safety of robots and electrical systems, machines, electrical installations in case of emergency conditions (short flickers, rewiring). However, with improper installation and operation, stench can be the cause of an accident, fire that vibration, because. under the hour of їхної robots sparkle electric sparks, arcs.
The most wide-ranging devices for zahistu є:
swimming trunks zabіzhniki;
repeat automatic vimic;
thermal relay;
outbuildings shut down.
Fusible zapobizhnik it is called attachment to a strum, which exceeds the permissible value, melting a fusible insert and an electric lance are melted. Swimming zapobіzhniki - tse aparati zakhistu disposable diy.
Stock:
a) fuse insert;
b) contact attachment;
in) frame(Cartridge);
d) a inode for the first time(talc, quartz sand thinly) to improve arc extinguishing and visual indicator of spratsovuvannya.
Principle fusible indicators of the reasons for the fact that the strum, which should pass through the melting insert, see the heat, if it is equal to the eI - strum, that it should pass through the fusible insert, R - the fusible insert, t - the hour of the passage of the stream: at the first value of the stream I and hour t heat is seen to be sufficient to melt the fusible insert and the electric lance. So zdіysnyuєtsya zahist vіd struma navantazhennya that KZ.
Parameters of fusible guards
a) fusible link rated jet I n.vst . - Strum, for which the won is paid for with three valiant jobs and it is claimed for it.
b) nominal strum of the patron I e.g. . - Strum, equal to the greatest of Inst. On this stream, all stream-providing contact parts of the guardian are insured;
in) Rated voltage U e.g. . - voltage, which shows the greatest voltage, with which it is allowed to zastosovuvat and indicate to the zapobіzhnik.
G) boundary jet switched on at given pressure I ex.pr. . - the most important strum of short circuit, which is guaranteed to have superior spratsovuvannya (without ruining the corps).
(3 hours) Opening hour of an electric lance, a fusible protector is the hour of heating the insert to the melting temperature, the hour of melting and burning, which is when the arc is melted.
Zalezhnіst povnogo vomknennia zabezhnik lancer vimk. vіd vіdnosny struma navantazhennya abo КЗІ/Ін.st. called zahisnoy characteristic, tobto. turn it down. =f(I/ In.vst.).
Delay for an hour, during which time the temperature of an element of an electrical installation reaches the maximum allowable in the case of moving the actual stream in a new I to the nominal stream In is called thermal characteristic of this element, tobto. load =f(I/ In).
The determination of the protection characteristics of fusible materials with the thermal characteristics of the elements that are protected allows us to evaluate
the possibility of an arrogant zakhist. (Fig.1)
I/I H.VST and I/I h
(5 xv) It can be seen that the insertion of the input characteristic BUT protects an element / installation with a thermal characteristic AT if there is a multiplicity of the strum, and the insertion is a characteristic W- Only when the multiplicity is greater than 4.
We need to pragnate that the hour of the turn-on was albeit less at di strumiv k.z. and mother zatrimku with strumah navantazhennya. You can rob:
right select the material of the fusible insert;
vicorist metallurgical effect;
vibrati rational construction.
Inserts h fusible metals (tin, lead, zinc, aluminium) may have low thermal conductivity, so they heat up properly, the stench of the elements will protect the elements from the air.
Inserts h refractory metals ( mid, sreblo) may have low heat capacity and high heat conductivity, which heats up quickly, give a smaller amount of time for an hour of changeover, which worsens their characteristics. Ale stink mayut great border strum included, to that zruchnі zahist elements in the strum KZ.
To lower the melting temperature (so that the stench heated up more), put the inserts in metallurgical effect Why, in the middle of the insertion of refractory metal, pour a bag of fusible metal (tin, an alloy of tin with cadmium and іn).
At the place where the bags are drunk, there is more refractory metal than fusible. Such an insert can improve the characteristic curve with streaks and lower the melting point (2-3 times lower than the melting point of the base metal).
3 dot zoru constructive vision on the zahisnu characteristic vplyvaє dozhina (for foreigners with U = 120 - 500V, the optimal length of the insert is 70mm) and insert form(Inserts are slit with decalcoma with parallel needles, vicorist inserts are with 2 - 4 short isthmuses).
Zapobіzhniki (inserts melting)- elements of the defense of electronic equipment, as well as life-support measures in case of various emergency situations that are used with the help of technics. Electricity zapobіzhnik є nevid'emnoy part of the zahist of electronics. The most popular of them are melting pots, glass or ceramics, zapobіzhniki.
Zapobіzhniki join groups for technical and constructive tributes. Dovzhina and diameter of the hull are to blame for the landing at the trimach on the board or outside well. The robotic strum is responsible for supporting the strum of the life dzherel zherel in the life, and so it is, the strum of the spontaneity of the navantage, if the guard of the installations at the exit of the dzherel, the working voltage - to the dzherel of the life dzherel.
Zapobіzhniki pod_lyayutsya on glass and ceramic and planting places: standard (cylindrical), dart (for soldering in the mounting open), knives (for special trims). For the protection of lances of the life of autoelectronics in the event of a short chime, swid-type auto-protectors are installed, the selection of which is carried out according to the nominal working stream. In the current designs of microelectronics, as a necessary element, a Chip-SMD is installed, a surface-mounted component, which is characterized by its size and nominal working jet. One of the new elements of protection is the protector, which is self-sustaining, which is a kind of building protection, not only in the form of overwhelm, but also in the form of overheating.
Yakіsnі vyroby kompanії Bourns they have proven themselves well in the Lanziugs as a defender of computer technology, auto electronics and telephony. A similar principle of operation of a fusible protector is a thermal protector - one of the leaders in the fusible outbuilding of the butt technology.
Transformers, praskas, electric kettles, heaters, heat vents and harmonics, and a lot of other electric heaters, but not all of them come from vicoristing zahisnym element - thermoprotector.
When buying, you should insure your boundary working strum and nominal working voltage. For the convenience of planting the zapobіzhnik in the electronic outbuildings, there are different types of vicarious. Among them are trims, which are mounted on a drukovanu board, like a double-ended type, and a zakhisny type, outside pads, which are mounted on the body of an attachment, dart trims, which can be stuck in autoelectronics, as well as bagatoposadkovі pіd kіlka zapobіzhnikovіv, scho vykoristovuyutsya in the bagato.
You can see and buy goods from our stores in the following locations: Moscow, St. Petersburg, Volgograd, Voronezh, Yekaterinburg, Izhevsk, Kazan, Kaluga, Krasnodar, Krasnoyarsk, Minsk, Naberezhni Chovni, Nizhniy Novgorod, Novosibirsk, Omsk, Perm, Rostov- on-Don, Ryazan, Samara, Tver, Tomsk, Tula, Tyumen, Ufa, Chelyabinsk. Delivery of the package by mail, through the Pickpoint delivery system or through the Euroset salons in the following places: Togliatti, Barnaul, Ulyanovsk, Irkutsk, Khabarovsk, Yaroslavl, Vladivostok, Makhachkala, Tomsk, Orenburg, Kemerovo, Novokuznetsk, Astrakhan, Penza, Lipetsk, Kirov, Cheboksary, Kaliningrad, Kursk, Ulan-Ude, Stavropol, Sochi, Ivanovo, Bryansk, Bilgorod, Surgut, Volodymyr, Nizhny Tagil, Arkhangelsk, Chita, Smolensk, Kurgan, Orel, Vladikavkaz, Grozny, Murmansk, Tambov, Petrozavodsk, Kostroma, Nizhnyovartov , Novorosijsk, Yoshkar-Ola and in.
You can buy goods from the group "Zapobіzhniki (smelting inserts)" in bulk and in retail.
Attachment, which is made up of a fusible metal element near a thin plate that looks like a body with a contact attachment, is called a protector. Vіn appointments for zakhistu elektrichnyh lanceugіv vіd strumіv navantazhennya that short zamikannya.
Trivale piercing the struma is the normal mode of robotic melting of the insert. Ale zbіlshennyam navantazhennya vshe nominalіnіnіnі ї chi viniknennya short zamikannya (I merezі >I insertion) metal is heated to the melting temperature і, melting, rozryvaє lansyug. On vіdminu vіd melting insert є disposable and with її spratsovuvannі pіdlyagaє zameni for a new one.
We prepare fusible inserts, as a rule, with an alloy of lead with middue, with tin, and also with other metals. Mid inserts before installation are tinned, so that the oxidation of the metal and the deterioration of the yogo conductive qualities disappear. The stench mayut a small transverse cut, so that a small opir may be drawn. There is a large number of guards to finish off with arc-extinguishing locks in the middle of the body (for example, fiber or quartz sand). A strum, which is a fusible insert, is called a nominal strum fusible insert of the I insert, on the basis of the nominal fuse of the I fuse. , for which the strum-conducting parts will be built, as well as the contact and arc-extinguishing parts.
The hour of burnout of the fusible insert to lie down in the struma that flows through it, and the fallowness of this struma in the hour of burnout t = f (I) is called the cold characteristic. Vaughn is shown below:
The small picture shows the characteristics of two different ratings 1 and 2. Won't have different nominal streams and how much more from the graph with one and the same stream of overwhelming attachments 1 to burn out more lower 2. Tsya power allows to secure the selective defense of electric lancers.
Behind the constructive features, you can see tubular parts and cork fittings.
Tubular parts are closed with casings made of gas-generating material fibri, at elevated temperatures, the pipes create a great pressure in the pipes for the fluff of which the opening of the lansyug is expected. Zapobіzhnik type PR:
De: 1 - flashing contacts, 2 - brass caps, 3 - brass rings, 4 - fuse insert, 5 - fiber tube.
Such an attachment is made up of a melting insert 4, which is cast into a fiber tube of a random type 5, reinforced with end brass rings 2, and contacts 1 flicker.
Cork zastosovuyut, as a rule, in lighting installations for zahistu butovykh spozhivachіv (electric chillers), as well as for electric motors in low and medium pressure. By the method of fastening with a fusible insert, the stench is blown out of the tubular parts.
This is how the defenders prove that they self-respect. The essence of their work is that with the heated stench they sharply change their opera at the bik, to produce the lancet until it bursts. As soon as the temperature drops to the operating temperature, the opir changes and the lance starts to flash again. Polymeric materials are taken as the basis of their design, which can be crystalline under normal temperature conditions and sharply turn into an amorphous state when heated.
Such zapobіzhniki have developed a wide range in digital technology (computers, mobile phones, APCS systems). Looking back at the great versatility of the power lancers, as a rule, you don’t get stuck. The stench is more rude, for those who don’t need to replace it after the opening of the lancet.
To add a lot of electricians, to avoid the frequent burnout of fuse-links, to make them so called "bugs" - to replace a special alloy with a fuse-link, to attach a wonderful drіt of a small peretina. There is no trace of this work, so that the hour of burnout of the alloy and the remarkable droth of such a cut can be greatly perturbed, which can lead to summative results. That is why you often ask for helpers, you should set the reason for the help, and not try to be rude with the way of installing "bugs".
You can also marvel at the power to protect the robot here:
