Among the protective devices in home wiring, residual current circuit breakers (RCDs) and differential machines (difavtomats) are becoming increasingly popular. Manufacturers produce them with various types of designs for use in single-phase and three-phase power supply schemes. All these devices have a common algorithm of work.

By and large, the difference between the RCD from the differential machine is the absence in the circuit of a circuit breaker that responds to excess load currents. Therefore, the connection diagram of a single-phase or three-phase RCD from the connection diagram of a differential automaton differs only in the absence of this function. To protect against short circuits and unacceptable loads, additional current protection is required in it. A common element of these defenses is the scheme ...

The current passing through the circuit breaker is determined by Ohm’s well-known law by the value of the applied voltage, referred to the resistance of the connected circuit. This theoretical position of electrical engineering is the basis for the operation of any machine. In practice, the mains voltage, for example, 220 volts, is supported by automatic devices of the energy supplying organization within the standards stipulated by state standards; it varies slightly within this range. Going beyond GOST is considered a malfunction, an accident.

The circuit breaker cuts into the phase wire of the power supply of lamps, sockets and other consumers. When the electric shaver is first fed from the outlet, and then the washing vacuum cleaner, then in both cases a current flows through the machine in a closed circuit between phase and zero. But, in the first case, it will be relatively small ...

A home foreman, who started repairing or making electrical wiring for his premises, always faces the issue of protecting his electrical equipment from preventing the development of possible emergency situations in it. Automatic switches that provide three functions allow this problem to be solved: convenient manual switching of connected circuits with power sources, reliable transmission of the load current in operating mode, protective automatic shutdown in the event of an accident.

It is no secret that any such device is created by the manufacturer to provide certain technical capabilities and has various characteristics. Therefore, there are a lot of such structures and for each particular workplace it is necessary to select the optimal machine. Well, now let's move on to the selection rules, dividing them into nine successive stages. A circuit breaker is usually installed inside ...

From the beginning of mass electrification of the country, the issue of ensuring the protection of electrical equipment and people from electric shock was an acute issue. For this purpose, the industry launched a mass production of fuses with fusible inserts equipped with a thin wire thread. It burned out during increased load or short circuit in a controlled circuit.

Their design included a permanently installed dielectric block with two contacts, into which a porcelain body with a replaceable fusible insert was screwed. Such fuses were installed in pairs in the phase and neutral wires of the supply network.

After a short operation, the disadvantages of this design were revealed: frequent burnout of calibrated insert threads caused by poor stability of the electrical characteristics of the power supply system and low technical literacy of the population ...

Residual current circuit breakers save a person from electrical injuries by removing voltage from the wiring when leakage currents occur through it. Invisible and uncontrolled violations of the insulation layer can cause enormous damage to our lives and property. Therefore, such protections are gradually gaining more and more popularity among the population.

Manufacturers produce these devices with a rather large assortment and endow them with various electrical characteristics that optimally select devices for the specific operating conditions of each wiring. The functions carried out by the RCD include: switching on the consumers, powered from the device, under voltage, reliable transmission of the rated load current without false alarms, disconnecting consumers under load, under normal conditions, disconnecting the controlled circuit when critical differences ...

A circuit breaker is a low-voltage protective device that protects electrical circuits from emergency operating modes such as overload and short circuit, and also allows manual switching of electrical circuits under load. If the circuit breaker is structurally equipped with a motor-drive, then it can be controlled remotely or automatically by applying a signal from various automatic devices.

Circuit breakers are used quite widely, since the concept of "low-voltage circuits" includes not only power circuits supplying various electrical appliances and equipment, but also communication circuits, telemechanics of equipment, various auxiliary circuits with voltages up to 1000 V. In this article we present the features of choosing automatic circuit breaker by criteria such as the number of poles ...

To equip their customers with high-quality electrical equipment, electricians must know which circuit breakers of which companies should be preferred. And in order to draw a conclusion about the quality of the machine, it is important to monitor operational malfunctions and know their design.

For this, the designs of automatic machines of three different companies were compared: ABB (Germany), IEK (Russia) and E.NEXT (China).

Structurally, all three machines were very similar and had all the necessary elements, such as: an arcing chamber, a bimetallic plate, a coil. Only by looking closely, it was possible to see the difference.

At the first stage, an ABB circuit breaker made in Germany was dismantled. The products of this manufacturer are considered one of the best in the world. About 30 of these devices were replaced in the electrical panel large supermarket, for a reason...

If the light goes out in the apartment, the sockets are turned off, or the electric stove stops working, then any person who is familiar with electrical engineering goes to the site to check the condition of the circuit breakers in the electrical panel. Most often, troubleshooting is reduced to restarting the machine.

The fact of operation of a modern modular circuit breaker is easily determined: the handle is in the "down" position, a round sign - "zero" is clearly visible on it. To turn it on, simply turn this knob up, then a horizontal line will appear, and we can assume that the mission is completed.

Many apartments in the post-Soviet space are equipped with guards with automatic machines of a slightly different type. AE series circuit breakers and the like have slightly larger dimensions, fasten to the base with long screws and have an unpleasant property ...