Introduction: Low-voltage switch, as the name implies is a kind of switch, and as soon as we talk about the switch, we all know that the switch is one of the most common electrical appliances in our life, and its role is mainly used for circuits and appliances between the non-generic conversion of the power supply and then go to energize, de-energize and overload control. Therefore, the low voltage switch is also known as low voltage isolator. Next this editorial will take you to recognize what kind of low voltage switch models.
Types and models of low voltage switches: In different occasions and places, the significance of low voltage switches are not quite the same. Generally speaking low voltage switches are mainly knife switches, combination switches and composite switches.1. Knife switch: knife switch is the simplest structure in the low-voltage switch, the most widely used appliances. Generally used in lighting circuits and infrequent start-up control circuits, usually in the circuit to play the role of on-off and isolation circuit. And commonly used knife switch models generally have a simple structure, there are inexpensive rubber cover gate switch HK, for infrequent connection and disconnection of the load of the circuit of the iron shell switch HH and when the line or electrical equipment is short-circuited or overloaded to cut off the fault fuse type switch HR
2. Combination switch: Combination switch is also known as the changeover switch, and the ordinary knife switch compared to the seismic performance is very good, the operation is also very flexible, but due to the high voltage and the high voltage, the switch is very easy to operate. Compared with the ordinary knife switch, the combination switch has very good anti-vibration performance, and the operation is also very flexible, but because of his low throughput capacity, it does not have overload protection and short-circuit protection. The models of this combination switch are combination switch HZ5 series and combination switch HZ10 series and so on.
3. Load switch: load switch is used for power switch, isolation switch and emergency switch, and it also has the role of protecting the circuit. Its model has load switch HK2 series, load switch HH3 and HH4 series and so on.
What are the common types of low voltage switches?
There are the following models GGD, GCK, GCS, MNS, MCSGGD series:
l?Usage
GGD type AC low-voltage distribution cabinets are suitable for substations, power plants, factories, mines, and other power users AC 50Hz, rated operating voltage 380V, rated working current 1000-3150A distribution system. 3150A power distribution system, as power, lighting and power distribution equipment for power conversion, distribution and control.
GGD type AC low-voltage distribution cabinet is a new type of low-voltage distribution cabinet designed according to the requirements of the Ministry of Energy, the majority of power users and the design department, in accordance with the principles of safety, economy, rationality and reliability. The product has high breaking capacity, good dynamic thermal stability, flexible electrical program, convenient combination, series, practicality, novel structure, high protection level. It can be used as a new generation of low-voltage switchgear.
Product model and meaning
Structural features
1, GGD type AC low-voltage distribution cabinet cabinet adopts the universal cabinet form, the frame is assembled with 8MF cold-formed steel partially welded, and there are 20-molded mounting holes, with a high degree of generality.
2, GGD cabinet fully consider the problem of heat dissipation. There are different numbers of cooling slots at the upper and lower ends of the cabinet, when the cabinet electrical components heat up, the heat rises, through the upper end of the slots discharged, and the cold air continuously from the lower end of the slots supplemented into the cabinet, so that the sealed cabinet from the bottom up to form a natural air duct, to achieve the purpose of heat dissipation.
3, GGD cabinet in accordance with the requirements of modern industrial product modeling design, the use of the golden ratio of the method of designing the cabinet shape and the division of the size of the various parts of the cabinet, so that the whole cabinet is beautiful and elegant, a new look
4, the cabinet can be removed when needed, to facilitate the assembly of the main busbar and the adjustment of the site, the cabinet top of the corners of the four corners of the installation of lifting rings for lifting and loading and transporting.
5. The protection level of the cabinet is IP30, and users can choose between IP20-IP40 according to the requirements of the environment.
GCK series
l?Product model and meaning
GCK?G is enclosed switchgear?C is extracted?K is control center
GCK low-voltage extracted switchgear (hereinafter referred to as the switchgear) consists of power distribution center (PC), motor control center (K) and power distribution center (PC). cabinet and motor control center (MCC) two parts. The device is suitable for AC 50 (60) HZ, rated voltage less than or equal to 660V, rated current 4000A and the following control of power distribution system, as power distribution, motor control and lighting and other power distribution equipment.
GCK switchgear is in line with IEC60439-1 "low-voltage switchgear and control equipment", GB7251.1-1997 "low-voltage switchgear and control equipment", GB/T14048.1-93 "Low-voltage switchgear and control equipment," and other standards. And has a high breaking capacity, good dynamic thermal stability, advanced and reasonable structure, flexible electrical program, series, versatility, a variety of program units in any combination, a cabinet.
The number of circuits accommodated by the more, save floor space, high protection level, safe and reliable, easy maintenance and other advantages.
Structural features
1, the cabinet adopts the assembled combination structure, modular hole installation, parts and components of strong versatility, applicability, high degree of standardization
2, the upper part of the cabinet body for the busbar room, the front for the electrical room, the rear for the cable room, the room between the steel plate or insulating plate for isolation, to ensure safety.
3, MCC cabinet drawer chamber door and circuit breaker or disconnecting switch operating handle with mechanical interlock, only the handle in the break position when the door can be opened.
4. The drawer of the receiving switch, contact switch and MCC cabinet has three positions: on position, test position and off position.
5. The top of the switchgear can be equipped with a busbar bridge according to the need of receiving power.
GCS series: product type and meaning
Use
GCS type low-voltage withdrawable switchgear is used in three-phase AC frequency of 50Hz, rated working voltage of 400V (690V), rated current of 4000A and the following generation and power supply system as a power, power distribution and centralized control of motors, capacitor compensation. Widely used in power plants, petroleum, chemical, metallurgy, textile, high-rise buildings and other places, can also be used in large-scale power plants, petrochemical systems and other high degree of automation, the requirements of the place and computer interface.
Executive standard:
This product conforms to the requirements of GB7251.1-1997 "Low-voltage switchgear and control equipment" and JB/T9661-1999 "Low-voltage withdrawable switchgear".
Structural features:
1. The frame is made of 8MF type open steel, and the main frame is installed with Φ9.2mm mounting holes of modulus E=20mm and 100mm, which makes the assembly of the frame flexible and convenient.
2. The functional rooms of the switchgear are isolated from each other and the compartments are divided into functional unit room, busbar room and cable room. The role of each room is relatively independent.
3. Horizontal busbar is arranged in a flat position behind the cabinet to enhance the busbar's ability to resist electric power, which is a basic measure to enable the main circuit to have high short-circuit strength.
4, cable compartment design makes the cable up and down the access are very convenient.
5, drawer height modulus of 160mm. drawer change only in the height of the dimensions of the change, its width, depth dimensions remain unchanged. The drawer of the same function unit has good interchangeability. Unit circuit rated current 400A and below.
6, the drawer panel with a split, close, test, pull out the position of the obvious signs. Drawer unit with a mechanical interlocking device.1 drawer unit as the main body, at the same time with the pull-out and fixed, can be mixed and combined, arbitrary use.
7, the protection level of the cabinet for the IP30?IP40, can also be selected according to user needs.
MNS series: use
MNS type low-voltage withdrawable switchgear (hereinafter referred to as the switchgear) to adapt to the needs of the development of the electric power industry, reference to foreign MNS series of low-voltage switchgear design and improve the development of advanced low-voltage switchgear, which conforms to the national standards GB7251, VDE660 and ZBK36001-89 "low-voltage switchgear". The product complies with national standards GB7251, VDE660 and ZBK36001-89 "Low-voltage switchgear" and international standard IEC439. MNS type low-voltage switchgear adapts to the needs of various power supply and distribution, and it can be widely used in various low-voltage distribution systems, such as power plants, transformer substations, industrial and mining enterprises, buildings and hotels, and municipal construction.
Structural features
1. The frame of MNS-type low-voltage switchgear is a combined structure, and the basic skeleton is assembled by C-type steel. All structural parts of the cabinet frame are galvanized, and are firmly connected to the basic cabinet frame by self-tapping locking screws or 8.8 grade hexagonal bolts, together with the doors, partitions, mounting brackets, and busbar functional units corresponding to the changes in the program, the cabinet is assembled into a complete switchgear cabinet. The internal dimensions of the switchgear, the dimensions of the components, and the dimensions of the compartments are varied in accordance with the modularization (E=25mm).
2. Each cabinet of MNS type combined low-voltage switchgear is divided into three chambers, i.e., horizontal busbar chamber (at the rear of the cabinet), small drawer chamber (at the front of the cabinet), and cable chamber (at the lower part of the cabinet or at the front of the cabinet on the right side). The rooms are separated from each other by steel plates or high-strength flame-retardant plastic function boards, and there are metal plates with ventilation holes between the upper and lower drawers to effectively prevent switching components from failing due to flying arcs or short-circuiting of buses and other circuits.
Low-voltage switching safety operation: Low-voltage switching safety operation is to say that when the power supply is first open the main switch or sub-switch or air switch? In fact, the low-voltage switch is the closest switch with the load switch, generally speaking, must first be put in the main switch is open, and then open the sub-switch last and then close the air switch. When you disconnect the power, you must pay attention to the load switch, then disconnect the air switch, and finally disconnect the main switch. Low-voltage switch protective knowledge: Low-voltage switches are generally self-current long delay protection and short-circuit instantaneous protection, the total switch protection value in the factory has been set up this point do not have to worry about, in the purchase of time should be based on the need to choose to buy the right switch, so that not only to protect your own safety and security, but also safe and convenient use of electrical appliances. The first thing you need to do is to use the switch to protect your own safety. Well, the above is this small editor for you to introduce the low-voltage switch model and its role, you hear this whether the low-voltage switch has a deeper step to recognize it? As the saying goes, live to learn old is not exactly what we say now ~Tubarabbit online free for everyone to provide "various decoration offer, 1-4 local decoration company, 3 sets of decoration design program", and decoration to avoid pit strategy! Click on this link:/yezhu/zxbj-cszy.php?to8to_from=seo_zhidao_m_jiare&wb, you can get it free of charge~