NOUVELLES

What is the principle of under and over voltage protection protector?

Under and over voltage protection protectorcontrol circuit 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...

Multimedia distribution box is the development trend of home decoration

Multimedia system refers to television, telephone, computer network, multimedia center, electronic automatic alarm system centralized control device design, namely the family by these cable connection devices can be controlled by a centralized equipment. The general multimedia system is mainly compo...

Two control modes of electrical transfer switch are analyzed

Double powerelectrical transfer switchis mainly used for two power supply (electric supplytoelectric supply,electric supplytoelectricity generator etc.) the automatic and manual switching operation, the general practice is set to double power supply automatic switching operation mode, to ensure the ...

Advantages of plastic meter box (transparent electric meter box)

The newplastic meter box(transparent electric meter box) not only reads the ammeter well, but also is elegant and safe and practical. In the spirit of "you use electricity, I attentively" service concept, in this year's rural power network transformation and upgrading project, all the old "iron mete...

What is the role of distribution box

Distribution box(multimediadistributionbox)is in accordance with the requirements of electrical wiringtoassembleswitch equipment,meter,maintenanceapplianceand auxiliary equipment in a closed or semi closed metal cabinet or screen,to form low voltage distribution equipment. When normal operation,itca...

The difference between the over voltage and under voltage protection devices and the circuit breaker

It is often said that if there is noovervoltageandundervoltageprotectiondevices, we can use the circuit breaker instead. So many users to listen to this method, with a circuit breaker instead ofover-undervoltage protection to protect the electricity load, the results more harm than good, household e...

Matters needing attention in installation and use of plastic meter box or electric meter box

Matters needing attention in installation and use ofplastic meter boxorelectric meter box 1. Please carefully check the meter box partsinthe installation. 2. Installation location should be selected without severe vibration, the impact is not enough to damage the electrical components of the place. ...

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 compon...

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

Tripping reason ofplastic 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 closing...

Analysis of energy saving technology for AC contactor

Electrical ac contactoris 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, the ...

What is the principle of overvoltage and undervoltage protection devices?

Since theovervoltage and undervoltage protection devicesadopts 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 off ...

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 electrica...

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 electr...

How to choose the residual current circuit breaker?

Select theresidualcurrentcircuit breakersshould 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 prevent e...

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. Themultimedia distributi...

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) installedresidual current circuit breakers, although leakage occurs, the fault line can disconnect, but the scope of protection; similarly, if only in the branch trunk (distr...

What protective function does the residual current circuit breakers have?

Theresidual current 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 specifications...

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

Residual current circuit breakers' main operating performance parameters are: ratedresidual currentcurrent, ratedresidual currentaction time, ratedresidual currentcurrent is not action. Other parameters are: power frequency, rated voltage, rated current and so on. 1. Ratedresidual currentcurrent in ...

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

What is the working principle of theresidualcurrentcircuitbreakers? 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 me...

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 wea...