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GCS AC Low Voltage Switchgear - Reliable China Suppliers & Factory for Power Distribution Solutions
Model and Definitions
Performance Indexes
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The design of the device complies with the following standards:
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IEC 439-1: Low-voltage switchgear and controlgear assemblies
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GB 7251: Low-voltage switchgear and controlgear assemblies
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ZBK 36001: Low-voltage withdrawable switchgear assemblies
Basic Parameters
| Main Current Nominal Voltage（V） | AC 380（4000)，(660) Exchange 380(400)、(660) | |
| Auxiliary Circuit Nominal Voltage(V) | AC 220、380(400) DC (110、220) |
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| Rated Frequency(Hz) | 50(60) | |
| Rated Insulation Voltage (V) | 660 (1000) | |
| Rated Currency(A) | Horizontal Busbar | ≤4000 |
| Vertical Busbar (MCC) | 1000 | |
| Bus Rated Short-time Withstand Current(kA,1s) | 50,80 | |
| Bus Rated Peak Withstand Current(kA/0.1s) | 105,176 | |
| Power Frequency Test Voltage (V/1min) | Main Circuit | 2500 |
| Auxiliary Circuit | 1760 | |
| Bus | Three-phase Four-wire System | A.B.C.PE.N |
| Three-phase Five-wire System | A.B.C.PE.N | |
| Level of Protection | IP30.IP40 |
Installation Features
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Improving the thermal capacity of transfer components significantly reduces the additional temperature rise caused by the temperature increase in connectors, cable heads, and partition plates.
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The segregation between functional units and compartments is clear and reliable. This ensures that the failure of one unit does not affect the operation of others, thus confining faults to the smallest possible scope.
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The horizontal arrangement of busbars enhances the device's dynamic thermal stability, allowing it to withstand short-circuit current impacts of 80/176 kA.
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Furthermore, the Motor Control Center (MCC) cabinets can accommodate up to 22 circuits each, fully considering the needs of large- capacity power generation and automation of electric motor clusters in industries such as petrochemicals.
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Connections between the device and external cables are completed within the cable compartment, allowing cables to enter and exit from either the top or bottom. Current transformers are installed within the cable compartment, facilitating easy installation and maintenance.
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Within the same Power distribution system, current-limiting reactors can be utilized to match and limit short-circuit currents, stabilizing busbar voltage at a specific value. This can also partially reduce the short-circuit strength requirements for components.
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Lastly, drawer units are equipped with a sufficient number of secondary connectors (32 pairs for one unit or more, and 20 pairs for half units), meeting the connection point requirements for computer interfaces and automatic control circuits.
Auxiliary Electric Devices
The design of auxiliary circuit diagrams complies with the "Technical Specifications for Power Supply Design of Thermal Power Plants" and other relevant design technical regulations. It is suitable for low-voltage power supply systems in power plants, substations, as well as low-voltage distribution systems in industrial enterprises and high-rise buildings.
The auxiliary circuit scheme is designed based on the main circuit scheme, divided into functional units for Power incoming lines, feeder lines (PC), and motor feeder lines (MCC) for operational control.
Installation Schematic Diagram
| Cabinet No. | A | B | C | D | remarks |
| GCS-TG1010-4 | 1000 | 1000 | 850 | 956 | Contact Cabinet |
| GCS-TG0810-4 | 800 | 800 | 650 | 956 | Power receiving cabinet |
| GCS-TG0808-4 | 800 | 800 | 650 | 756 | Power receiving cabinet |
| GCS-TG0608-4 | 600 | 600 | 450 | 756 | Power receiving cabinet |
Fig. 2 PC Cabinet Installation Schematic Diagram
| Cabinet No. | A | B | C | D | E | FXG |
| GCS-TG1010-2 | 1000 | 1000 | 850 | 956 | 60 | 400x400 |
| GCS-TG0810-2 | 800 | 1000 | 650 | 956 | 160 | 200x400 |
| GCS-TG0808-2 | 1000 | 800 | 850 | 756 | 60 | 400x400 |
| GCS-TG0608-2 | 800 | 800 | 650 | 756 | 160 | 200x400 |
Fig. 3 MCC Cabinet Installation Schematic Diagram
| Cabinet No. | A | B | C | D | E | FXG |
| GCS-TG1006-1 | 1000 | 600 | 850 | 556 | 60 | 400x350 |
| GCS-TG0806-1 | 800 | 600 | 650 | 556 | 160 | 200x350 |
Ordering Notices
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The order contract includes the following contents:
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The complete model of the product, including the main circuit scheme number and auxiliary circuit scheme number.
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The main circuit system combination sequence diagram
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The electrical schematic diagram of the auxiliary circuit.
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A list of components within the cabinet.
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Setting parameters for voltage, current, time, and other relevant factors in the circuit.
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Any other special requirements that do not conform to the normal use of the product.
Frequently Asked Questions
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Which international standards do these switchgear assemblies comply with?
Our devices fully comply with standard specifications including IEC 439-1 (Low-voltage switchgear and controlgear assemblies), GB 7251, and ZBK 36001.
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What are the rated currents for the horizontal and vertical busbars?
The horizontal busbar supports a rated current of up to 4000A, while the vertical busbar (MCC) is rated up to 1000A.
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What levels of environmental protection do the cabinets offer?
The cabinets are designed to meet IP30 and IP40 protection levels, ensuring adequate safety and dust protection for indoor industrial operations.
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How does the unit segregation design improve safety?
The clear segregation between functional units and compartments ensures that any failure in one drawer or unit does not affect the operation of adjacent units, confining faults to the smallest possible scope.
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Where are external cable connections completed, and how do they enter?
All external cable connections are completed within the dedicated cable compartment. Cables are designed to enter and exit from either the top or bottom of the cabinet for installation flexibility.
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What details must be specified when placing an order?
Orders must include the complete model number, main and auxiliary circuit scheme numbers, circuit combination sequence diagrams, auxiliary electrical schematics, a list of internal components, parameter settings (voltage, current, time), and any special requirements.