What are the accessories in the distribution box called

The distribution box is a commonly used electrical device in homes and factories. I remember that when I was a child, due to the limited conditions, the distribution boxes used at home were all self-made wooden distribution boxes. At that time, the low-voltage power distribution devices used in the distribution boxes were also Very few, generally there is a mechanical single-phase electric meter, two porcelain plug-in fuses, and a knife switch. Due to the limited conditions of the house at that time, there were few household appliances in the house, and the general distribution box in the house You can use the three above.

Now the distribution box used in self-built houses

The distribution boxes used in self-built houses have been greatly improved than before. Some time ago, when I was in my hometown, I discovered that the distribution boxes used in my own home are now unified by the power supply management department from the perspective of the distribution box shell. The specified size and style, the distribution box installed in the home only has the main air switch with leakage protection and each sub-air switch. The electric meters of each household are required to be installed in a place not far from the home, and the key of the electric meter box is controlled by The power supply management department saves it uniformly, and the user cannot open it, which also avoids the user's manipulation of the electric meter. In general, for the distribution box used in rural homes, it is mainly installed with an air switch with a leakage protector.

Distribution box in a commercial house

For the commercial houses we buy in cities and towns, distribution boxes are also installed at the entrance of each house. The distribution boxes installed in such houses generally have small three-pole air switches and single-pole air switches with leakage protection. , Self-resetting undervoltage protector and lightning protection device.

The air switch in the home distribution box is divided into a main switch and each sub-switch. The set current value of the main switch is 63A or 40A, and the set current value of the sub-switch is 20A, and each sub-switch has a leakage protection function. , The leakage detection value is all 30mA. When a leakage accident occurs in household appliances in the home, the switch will trip when the leakage current reaches 30mA. Two days ago, my friend just finished the renovation, and asked me to install some lamps for him by the way. I took a few pictures of the components in the household lighting distribution box. The distribution boxes installed in the home are all built-in installation methods, and the installation height is 1.5 meters.

Let’s share with friends the following basic information about the distribution boxes currently used in the home. First of all, we must make clear that the household distribution boxes are mainly used to provide power to household appliances and lighting fixtures in the home, and they also have certain control and protection functions, such as Undervoltage protection, short circuit protection, leakage protection, lightning protection, etc. After we buy the house, the developer has already configured the distribution box according to the standard. It is generally composed of two parts, one is the electricity meter and the main switch used in the house, which are installed on each floor of the building. In the dark box, the key of the cabinet is kept by the electrician of each community property, and can only be opened by the property when the main switch is tripped or there is a problem with the electric meter.

We can see that whether it is a distribution box used in self-built houses or a standard distribution box used in commercial houses, the low-voltage power distribution devices inside are still very simple, generally including air circuit breakers, leakage protectors, and undervoltage protectors. , Lightning protection device, grounding bar, zero bar and DIN metal rail.

Distribution boxes and power distribution cabinets in the factory

The distribution box (cabinet) used in the factory is generally larger in volume than household ones, and there are many low-voltage devices in it. Generally, three-phase watt-hour meters, isolating switches, voltage circuit breakers, transformers, etc. are used. In addition to the lighting power distribution function, it also has certain control functions. For example, in some distribution boxes, for control needs, low-voltage control appliances such as relays will be installed in the factory distribution boxes (cabinet).