সংবাদ প্রতিবেদন

Standard for selection of AC contactors installed in stainless steel distribution cases As summer approaches, the peak period of electricity consumption will come as scheduled. The stainless steel distribution box, as a power unit, will be bigger in the summer than in the future. The internal compo...

How to solve the tripping of the plastic electrical distribution box?

Tripping reason of plastic electrical distribution box: 1. check the air switch for damage. 2. check air switch wiring is correct. Incorrect and re wired. 3. check the air switch on the load side of the line insulation, if the short circuit grounding, after the need to troubleshoot the normal clo...

Analysis of energy saving technology for AC contactor

Electrical ac contactor is widely used in low voltage circuit. It is a kind of industrial necessity with safe, convenient control, large quantity and wide range. Rated current China is now widely used in 63A and above, in the capacity of electrical ac contactor should be more than million units, th...

What is the principle of overvoltage and undervoltage protection devices?

Since the overvoltage and undervoltage protection devices adopts high speed low power micro processor design as the core, the magnetic latching relay main circuit, modular double standard, when the power supply line overvoltage, undervoltage protection, to continue to shock quickly and safely cut o...

Why has the protection been connected to zero (ground), but also install residual current circuit breakers?

The protection range is limited whether the protection is connected to the ground or the ground. For example, the protection of zero connection is to connect the metal casing of the electrical equipment to the zero line of the power grid, and to install the fuse on the power side. When the electric...

What is direct contact and indirect contact protection?

When a human body contacts an electrified body, there is an electric current passing through the human body. It is called an electric shock to the human body. According to the cause of electric shock, the human body can be divided into direct electric shock and indirect electric shock. Direct elect...

How to choose the residual current circuit breaker?

Select the residualcurrentcircuit breakers should be used in accordance with the purpose and according to operating conditions: For protection purposes: ① to prevent personal shock for the purpose. Installed at the end of the line, the choice of high sensitivity, fast leakage protector. ② to preven...

In accordance with the requirements of hierarchical distribution, how many settings should the distribution box have?

Construction site general distribution according to three, so the electric box should also be graded settings, that is, under the total distribution box, set the distribution of electric boxes, distribution boxes below the switch box, switch box below is the power equipment. The multimedia distribut...

Why should we adopt fractional protection for residual current circuit breakers?

Low voltage power supply and distribution generally adopts hierarchical distribution. If only at the end of the line (switch) installed residual current circuit breakers, although leakage occurs, the fault line can disconnect, but the scope of protection; similarly, if only in the branch trunk (dis...

What protective function does the residual current circuit breakers have?

The residualcurrent circuit breakersaremainly provided when the electric equipment has the leakage fault, and when the residualcurrent circuit breaker is installed, the overcurrent protector is additionally installed. When fuse is used as short circuit protection, the selection of its specification...

What are the main technical parameters of the leakage circuit breaker?

Residual current circuit breakers' main operating performance parameters are: rated residual current current, rated residual current action time, rated residual current current is not action. Other parameters are: power frequency, rated voltage, rated current and so on. 1. Rated residual current cu...

What is the working principle of the residual current circuit breakers?

What is the working principle of the residualcurrentcircuitbreakers? 1. When the leakageofelectrical equipment occurs, there are two anomalies: (1) the balance of the three-phase current is destroyed, there is zero sequence current; (2) normal non-charged metal shell to ground voltage (normal, the ...

What is the structure of the residual current circuit breakers?

Residualcurrentcircuitbreakersaremainly composed of three parts: detection components, the middle of amplification, operation of the implementing agencies. ① detection components. By the zero sequence transformer, the detection of leakage current, and send a signal. ② amplification link. Will be we...

Three driving force of China surge protector Market

Surge protection device used in industry is closely related to the national policy guidance, such as the communications industry, construction industry, at the same time, steady development in the Chinese economic dimension under the condition of China surge protection device market experienced in ...

Prediction of the development trend of electrical equipment industry in China

Prediction of the development trend of electrical equipment industry in China 1. The gap between home and abroad is shortened "13th Five-Year" period, China's low-voltage electrical products from the past to the pursuit of high yield gradually tend to pursue high quality, reliability and appearance...

Prediction of the development trend of electrical equipment industry in China

Looking forward to the future, China's low-voltage electrical equipment industry has the following trends: 1.Adjustment of product structure According to the national policy, the structure of low voltage electrical appliances needs further adjustment in the future. Products with backward process, l...

The most fundamental reason for home use of fiber termination box

The most fundamental reason for home use of fiber termination box: 1. Fiber termination box, the most basic function: optical fiber protection. Friends who have used fiber optics know that fiber is thinner than hair. It's easy to break, and it's hard for us to connect. 2. Fiber termination box is d...

What is surge protection device?

Surge protection deviceis an indispensable device in the lightning protection of electronic equipment. It used to be called "lightning arrester" or "over-voltage protector". The English abbreviation is SPD. What are surge and peak voltage? Surge and peak voltage (pulse) refers to the increase of "c...

Composition of automatic transfer switch

Automatic transfer switch, as its name implies, it consists of one or more switches and other necessary electrical appliances.It can monitor the circuit of the power supply in real time, and the dual power automatic switching switch has the standby power besides the common power supply. Automatic t...

Reasons and Maintenance Methods of Burnout of Molded Case Circuit Breaker

Reasons for Burnout of Closing Coil of Molded Case Circuit Breaker 1.Circuit breaker mechanism failure. When the circuit breaker closing control circuit is normal, the circuit breaker body of the conductive rod, drive rods such as jam, or because the circuit breaker operating mechanism is not well ...