Is there a positive or negative connection for a fuse? How to connect this kind of fuse

Semiconductor fuses have no polarity, so there is no positive or negative. The difference with ordinary fuses is that the fuse or fuse is made of pure silver material, which has the characteristics of fast short-circuit fusing speed, so it is also called a fast fuse, which can effectively protect semiconductor devices.

The type of fuse is determined according to the conditions of use. When selecting a fuse specification, select the fuse specification first, and then select the fuse specification according to the fuse specification. The protection characteristics of the fuse should match the overload characteristics of the protected object.

In the power distribution system, the fuses at all levels should be matched with each other, and the rated current of the upper melt is 2-3 times that of the lower melt.

The fuse is said to have no positive or negative, but some fuses will pop out a pin when fusing to start the fuse sign on the switch cabinet or start the light plate, at this time, when installing the fuse, attention should be paid to installing one end of the ejection pin in the corresponding position, although the installation does not affect its function, but it may not be intuitively found when the fuse.

No, the fuse will be selected according to the equipment specifications before use, and the power supply will be cut off when the current is too large.

No, it's just a piece of metal with a low melting point.

No, it's just a resistor, or a piece of wire, with no plus or minus.

A fuse refers to an electrical appliance that melts the melt and disconnects the circuit with the heat generated by itself when the current exceeds the specified value. The fuse melts the melt according to the heat generated by itself after the current exceeds the specified value for a period of time, so that the circuit is disconnected; A kind of current protector made by using this principle.

q=i 2 r t, the square of the current, the resistance, and the time are all scalar quantities, so there is no positive or negative number for the fuse.

It depends on what kind of fuse, some have it, some don't, of course, not strictly speaking, no, but strictly speaking, there is.

Because the fuse is also the so-called fuse, they are set to have the ability to flow through, more than this current will be heated and burned out, some fuses are transparent, only through the glass to see the section, and some fuses are opaque, this fuse is generally provided with a spring and a red heart point at one end, if the fuse is burned out, this red heart point will pop out.

So it doesn't matter which outfit it is, but if you need to check whether the fuse is blowing or not, and you encounter this opaque, it's better to install the end with a small red dot on the part where you can see it!

The first thing to do is to have a junction box with cards in it. Snap that switch of yours to the card inside the junction box. Then connect the live wire input to the binding post above the switch, and the output to the binding post below.

This fuse installation method is equivalent to a single-way empty opening!

Mounted on the card slot of the switchboard!

In the electrical circuit, it is generally connected in series with the empty opening on the load circuit!

Example: Single-phase 220V power supply circuit.

This kind of fuse is mainly used in the distribution box, one end of the inlet line (power supply positive line), one end of the line (power supply positive line), the main function is to protect the wire under the short circuit or other settings, reduce electric shock.

This fuse is rail-mounted, which is the same as that of a normal air-open installation.

When installed, it faces the printing, up and down. In this example, Figure 1 is reversed.

Stuck on the rail, wiring like the 1P small circuit breaker, up and down, plug in the round ceramic fuse, pay attention to the diameter and length of the fuse.

This kind of fuse is not installed with an ordinary fuse, but with a matching fuse (instant fuse), as shown in the figure below

This is a modular fuse, you can press and hold the handle by hand to break it, the inside is empty, you need to load the fuse in it like a rifle, this fuse can be compatible with the electrical rail installation, easy to use.

This kind of fuse is installed on a guide rail, which is the same as the ordinary air opening connection, up and down, open the dissolver, and install the corresponding data fuse!

The fuse is connected to the top in and bottom out, and its structure is a movable replaceable fuse core in the middle, which can be different according to the current carrying capacity.

version to select different specifications of fuses to make the right to use. Its function is the same as the previous porcelain cutting, and it is the same as the current mainstream air opening, but the only difference with the air opening is that when the line is abnormal (short circuit or overload) and the protective disconnection of the time and space is open without visible obvious breakpoints, and the fuse is visible obvious breakpoint, although the action sensitivity and convenience are not as good as the air open, but the reliability of the cut line is indeed relatively high, and it can be used in combination with the air opening at ordinary times.

Fuses are used to protect electrical equipment. It can be strung directly into the power cord of the device. If it's three-phase electricity, string one on each item.

If it is 220V, only one in series on the live wire is fine. It is located below the power supply, in front of the device.

Din rail installation, open the upper cover and install the fuse corresponding to the current used, there are two interfaces, the upper interface is the live wire inlet, and the lower interface is the live wire outlet.

One end of the fuse is connected to the power supply, and the other end is connected to the electrical appliance, and the fuse with appropriate current is installed in the fuse.

This fuse is a single-way switch, you can first connect the zero wire of the wire to be connected directly, and then connect the incoming wire head of the live wire to the upper contact of this fuse, and then connect the power transmission to the following contact tightly, if you want to turn on the power, just pull the switch up to turn on the power supply.

Install it on the guide gauge in the distribution box, wire it according to the normal empty opening single P wiring method, and pull down the dial jaw to insert the appropriate melter or fuse.

The upper and lower claws of the fuse are connected with a wire, and the fire wire or the positive power line is connected.

The upper part of the model is connected to the incoming wire, and the lower part of the indicator is connected to the outgoing wire.

This type of fuse is an upper and lower assembly line, and there is also a glass fuse in the middle.