GCS-type low-voltage withdrawable switchgear

The GCS-type low-voltage withdrawable switchgear (hereinafter referred to as the “device”) is a product jointly designed by two departments. It has been developed in response to the requirements of industry authorities, a broad base of power‑user customers, and design institutions, and is tailored to national conditions. Featuring high technical performance indicators, it meets the evolving needs of the power market and is capable of competing with existing imported products. The device complies with international standard IEC 439‑1, “Low‑Voltage Switchgear and Controlgear Assemblies,” as well as the national standards GB 7251.12‑2013, “Low‑Voltage Switchgear and Controlgear Assemblies,” and ZBK 36001‑89, “Low‑Voltage Withdrawable Switchgear Assemblies.”

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High- and Low-Voltage Switchgear Series

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Product Description

　　Overview

　　The GCS-type low-voltage withdrawable switchgear (hereinafter referred to as the “device”) is a product jointly designed by two departments. It has been developed in response to the requirements of industry authorities, a broad base of power users, and design institutions, and is tailored to national conditions. Featuring high technical performance indicators, it meets the needs of the evolving electricity market and is capable of competing with existing imported products. The device complies with international standard IEC 439‑1, “Low-Voltage Switchgear and Controlgear Assemblies,” as well as the national standards GB 7251.12‑2013, “Low-Voltage Switchgear and Controlgear Assemblies,” and ZBK 36001‑89, “Low-Voltage Withdrawable Switchgear Assemblies.”

　　This equipment is suitable for distribution systems in industries such as power plants, petroleum, chemical engineering, metallurgy, textiles, and high-rise buildings. In large power plants and petrochemical facilities—where automation levels are high and computer interfacing is required—it serves as a low-voltage complete switchgear assembly for power distribution, motor centralized control, and reactive power compensation in three-phase AC systems with a frequency of 50 (60) Hz, rated operating voltages of 380 V (400 V), (690 V), and rated currents of 4,000 A or less.

　　Structural features

　　The frame is constructed from 8MF cold‑rolled profiles, with mounting holes of Ø9 mm arranged on both side faces at module pitches of 20 mm and 100 mm, enabling flexible and convenient assembly.

　　The frame’s side‑frame assembly is available in two configurations: a fully assembled structure and a partially welded structure (for the side frames and cross beams), allowing users to choose according to their needs.

　　The functional compartments of the device are isolated from one another, with each compartment divided into a functional unit room, a busbar room, and a cable room. Each compartment performs relatively independent functions.

　　The horizontal main busbar adopts a rear‑of‑the‑cabinet, horizontally mounted arrangement to enhance its ability to withstand electrodynamic forces, which is a fundamental measure for ensuring that the equipment’s main circuit possesses high short‑circuit withstand capability.

　　The cable compartment is designed to allow convenient cable entry and exit from both the top and bottom.

　　Operating environmental conditions

　　For indoor installation:

　　The ambient air temperature shall not exceed +40°C, nor fall below -5°C, and its 24-hour average temperature shall not exceed +35°C.

　　The air is clean, free of explosive gases, corrosive gases, and conductive dust.

　　The relative humidity shall not exceed 50% at a maximum temperature of +40°C; at lower temperatures, higher relative humidity levels are permissible—for example, 90% at +20°C—provided that, due to temperature fluctuations, occasional moderate condensation may occur.

　　The elevation does not exceed 2,000 m.

　　The temperature during transportation and storage may range from −25°C to +55°C; for short periods (not exceeding 24 hours), it may reach up to +70°C.

　　Technical Performance Parameters

Rated Voltage of the Main Circuit (V) Rated voltage(V) of main circuit		AC 380 (400), (600) AC380(400), (600)
Rated Voltage of Auxiliary Circuit (V) Rated voltage(V) of subsidiary circuit		AC 220, 380 (400) AG220, 380(400) DC 110, 220 DC 110, 220
Rated frequency (Hz)		50(60)
Rated insulation voltage (V)		660(1000)
Rated current (A)	Horizontal busbar	≤4000
	Vertical busbar (MCC)	1000
Rated short withstand current of busbar (kA/1 s)		50, 80
Rated crest current of busbar (kA/0.1 s)		105, 176
Power-frequency test voltage (V/1s) Test voltage (V/1s)	Main circuit LS circuit	2500
	Auxiliary circuit	2500
Busbar	Three-phase four-wire system	A, B, C, PEN
	Three-phase five-wire system	A, B, C, N, PE
Protection grade		IP30