The modular circuit breaker automatic BA47-29 is made in accordance with the international standard GOST 50345-99. This device can have different poles, power, and a number of other characteristics, so that with its help you can easily equip a distribution board for relatively little money.
Manufacturers differences
The VA 47-29 assault rifle is available in two manufacturing options - China or Russia. The first is manufactured by IEK (InterEnergoKomplekt) and is positioned as a solid Chinese product that will provide its owner with protection from negative effects on the electricity network for a long time. The warranty for such devices is 3 years.
The second option is a VA 47-29 circuit breaker from the Kursk Electric Equipment Plant, which is guaranteed for up to two years.
Design features
The equipment is manufactured taking into account the following features:
- The design, by means of which the thermal trip setting is adjusted, works by screwing the adjusting screw into the base of the device, which eliminates the risk of accidentally changing parameters during operation of the circuit breaker.
- The contacts are coated with a special material containing silver.
- VA 47-49 circuit breakers are characterized by reduced losses between the terminals and the conductor.
- All moving contacts inside the device are coated with a special silver coating for maximum service life and reliable operation.
- The machine uses a high-speed contact disengagement system, which prevents the current from reaching peak values when a short circuit occurs.
- Wires having a diameter of up to 20 mm can be connected to the device.
- The equipment is designed for more than 6000 on-off cycles.
In this case, the machine can be installed arbitrarily in any place.
Advantages of VA 47-29 circuit breakers
Among the advantages of modular circuit breakers are:
- Non-separable design with four (Russia) or six (China) rivets that combine all parts of the body.
- Existence of the indicator of position of contacts. Lights up green when they are open, or lights up red while the system is energized, when the contacts are connected.
- The presence of combined protection against exposure to power overcurrents. The thermal release responds in time to the occurrence of any overloads in the network, while the electromagnetic trips if it detects the occurrence of a short circuit in the network.
- The standard width of the module is 18 mm and corresponds to the width of one pole. For example, if a VA47-29 three-pole machine is purchased, its width will be 54 mm.
- Spring-loaded latch so that you can conveniently mount the device on a DIN rail.
- Seal with which the screws of the terminal blocks are fixed.
- Ribbed surface of the clamps, which ensures effective fixation of the connected cores.
- The switching capacity is at the level of 4.5 kA (maximum current of the short circuit switched by this equipment), which is quite enough for domestic use.
The BA 47-29 submachine gun is an inexpensive and practical option for ensuring the safety of electrical networks in any modern home.
Device operation
Switching machines VA 47-29 are quite common equipment.Often found not only in household, but also in many industrial power networks. Using such a device provides:
- manual blackout in a fixed facility;
- automatic shutdown after a certain period of time in a specific area where an overload was recorded, or instantly in the place where a short circuit was detected;
- long carrying out of rated current.
The VA 47-29 circuit breaker has technical specifications that meet world standards, which allows it to maintain its performance under conditions of AC voltage at a level of up to 240 volts (between neutral and phase) or up to 400 volts (between phases) at a frequency of 50/60 Hz
Previously, there was a modernized series of such machines, which was called VA 47-29M, but at the moment, none of the manufacturers is engaged in its production, since the model is completely replaced by the standard series VA 47-29.
Specifications
To order a VA 47-29 assault rifle that is suitable for the right conditions, you need to understand its technical characteristics. A circuit breaker can have four pole options: 1P, 2P, 3P and 4P. The value of the rated current in it can have different indicators: from 0.5 to 8 or from 10 to 63 amperes.
The protective characteristics of this equipment are marked B, C or D. The most common option is C, as it is most suitable for low-power systems in terms of price and quality. Features of protection classes:
- B - the device will instantly operate if a short circuit of 3-5 * In is registered in the connected mains. Such equipment is most often used when it is necessary to provide protection for long conductors.
- C - the machine will immediately turn off the electricity at the facility if it records a current of 5-10 * In. This option is the most common among users.
- D - the circuit breaker will only work if a short circuit current occurs in the range 10-50 * In.
In is the nominal current value, which is indicated in amperes.
If a circuit breaker is installed at the facility, in which the rated current indicator is 10 amperes, and the device itself corresponds to protective class C, when an overcurrent appears in the mains, the device will instantly work only after the equipment starts operating in the range of 50-100 amperes.
Modular switches are characterized by reduced accuracy, while block switches have an error of 20%.
Motor protection
If a circuit breaker belonging to protective class C is used in the system, the equipment may be triggered when the unit starts up, when the currents reach ten rated values or even exceed this indicator. To eliminate this risk, in the vast majority of cases, use modular devices belonging to protective class D.
It is important to make sure that the system is reliably protected from overload currents, which ultimately negatively affect the duration of the insulation used. The switch should be located as close as possible to the electric motor, and the thermal relay is best installed on the starter in order to achieve equal temperature operating conditions for this equipment. It often happens that the thermal release is wasted when exposed to any heat sources, or does not work at all if it is at a low temperature.
Introductory apparatuses are best equipped with VA47-100 circuit breakers, which are characterized by an increased ultimate breaking capacity, which is why they are a little wider in themselves.
