The GGD AC low-voltage power distribution switchgear is a technology development project launched by the Ministry of Energy in 1991 to promote the technological advancement of China's low-voltage power distribution industry and accelerate the upgrading of complete sets of low-voltage power distribution switchgear. 

The design and development were completed by the Joint Design and Depertment Group for Low-Voltage Complete Switchgear of the Ministry of Energy (NLS), and passed the ministerial appraisal hosted by the Mistry of Energy in October 1992. Currently, it is widely used throughout the country.

The GGD AC low-voltage power distribution switchgear is suitable for power distribution systems in power plants, substations, factories, mining enterprises, where the AC power supply is 50Hz, the rated working voltage is 380V, and the rated working current is up to 3150A. It is used for the conversion, distribution, and control of electrical energy for power, lighting, and distribution equipment. The GGD AC low-voltage power distribution switchgear is a new type of low-voltage power distribution switchgear designed according to the requirements of the superior department of the Ministry of Energy, the majority of power users, and design departments, based on the principles of safety, economy, rationality, and reliability. The product features high breaking capacity, good dynamic and thermal stability, flexible power schemes, convenient combination, strong series and practicality, novel structure, and high protection Class. It can be used as a product for upgrading complete sets of low-voltage switchgear. 

The GGD AC low-voltage power distribution switchgear meets standards such as IEC 439 "Low-voltage switchgear and controlgear assemblies" and GB 7251 "Low-voltage switchgear and controlgear assemblies."

◆ Ambient temperature: -5℃ to +40℃, with a 24-hour average not exceeding +35℃. 

◆ Indoor installation, and the altitude of the place of use should not exceed 2000m.

◆ The relative humidity of the atmosphere does not exceed 50% at the highest temperature of +40℃, and a higher relative humidity is allowed at lower temperatures (e.g., 90% at +20℃). The potential impact of dew condensation due to temperature changes should be considered. 

◆ The inclination angle with the vertical plane during equipment installation does not exceed 5%. 

◆ The equipment is installed in a place without severe vibration and impact, and in a location that does not cause corrosion to electrical components. 

◆ The manufacturer can be consulted if the user has special requirements.

The cabinet of GGD-type AC low-voltage distribution switchgear is in the form of pass-through cabinet, and it is assembled by welding and installing 8MF cold-bent steel frame parts, which are produced by designated manufacturers to ensure the accuracy and quality of the cabinet. The general-prupose cabinet parts are designed according to the modular principles, with 20 mounting holes per module. The high coefficient allows the factory to achieve pre-production, which shortens the production cycle and improves work efficiency.

GGD cabinets are designed to fully consider the heat dissipation problem during cabinet operation. There are different numbers of heat dissipation slots on the upper and lower ends of the cabinet. When the electrical components inside the cabinet generate heat, the heat rises and is dissipated through the upper dissipation slots, while cold air continuously flows into the cabinet through the lower ventilation slots. This creates a natural ventilation channel from bottom to top within the sealed cabinet, achieving the purpose of heat dissipation.

GGD switchgear is designed according to the requirements of modern industrial product modeling. Using the golden ratio method to design the cabinet's external shape and the divison dimensions of each part to achieve an aesthetically pleasing cabinet. The cabinet door is connected to the frame by a pivot-type hinge, which is easy to install and remove. A mountain-shaped rubber strip is embedded in the folded edge of the door, and when the door is closed, the compression stroke of the embedded strip between the door and the structure can prevent the door from directly colliding with the cabinet body and also improve the door's protection class.

◆ The instrument door equipped with electrical components is connected to the frame with multi-strand soft copper wire. The mounting parts inside the cabinet are connected to the frame with knurled screws to form a complete grounding protection circuit for the entire cabinet.

◆ The cabinet's surface paint uses polyester orange peel powder coating, which has strong adhesion and good texture. The entire cabinet has a matte color tone, avoiding glare effect and creating a more comfortable visual environment for operators.

◆ The top cover of the cabinet can be removed when needed, which is convenient for on-site assembly and adjustment of the main busbar. There are lifting rings installed at the four corners of the cabinet top for lifting and transportation.

◆ The equipment installation should not exceed 5% inclination from the vertical plane.

◆ The protection class of the cabinet is IP30, and users can also choose between IP20 and Mp40 according to the requirements of the operating conditions.

The following technical information should be provided when ordering:

◆ The full model number of the product (including the main circuit scheme number and the auxiliary circuit scheme number)

◆ The main cirucit system combination sequence diagram

◆ The electrical schematic diagram of the auxiliary circuit

◆ A list of internal components

◆ Other special requirements that do not comply with the normal use conditions of the product