Product Overview

The GCS low-voltage withdrawable switchgear is suitable for power distribution systems in industries such as power generation, petroleum, chemical engineering, metallurgy, textiles, and high-rise buildings. In applications with a high degree of automation—such as large power plants and petrochemical facilities—that require interface with computer systems, it serves as a low-voltage complete set of distribution equipment for power distribution, centralized motor control, and reactive power compensation in AC three-phase systems with a frequency of 50 (60) Hz, rated operating voltages of 380 V (400 V) and 660 V, and rated currents of 4,000 A and below.

Terms of Use

● The ambient air temperature shall not exceed +40°C or fall below -5°C, and the 24-hour average temperature shall not exceed +35°C;

● For indoor installation and use; the altitude of the installation location shall not exceed 2,000 m.

● It is recommended that the ambient temperature not exceed +40°C and the relative humidity not exceed 50%. This is because temperature fluctuations may occasionally lead to condensation.

● If the requirements for normal operating conditions cannot be met, users are requested to consult with our company to resolve the issue. 。

Performance Metrics

IEC 439-1 Low-Voltage Switchgear and Control Gear Assemblies

GB 7251 Low-Voltage Switchgear and Controlgear Assemblies

ZBK360001 Low-Voltage Withdrawable Complete Switchgear

Main Structure

● The main structural frame is constructed from 8MF open-section steel, with mounting holes spaced at 20 mm and 100 mm intervals on both side faces, as well as Φ9.2 mm holes, enabling flexible and convenient internal installation.

● The main frame assembly is available in two configurations: a fully assembled structure and a partially welded structure (consisting of side frames and cross beams), allowing users to choose the configuration that best suits their needs.

● The functional compartments of the switchgear are mutually isolated, with the compartments divided into functional unit compartments, busbar compartments, and cable compartments. Each compartment performs a relatively independent function;

● The horizontal main busbar is arranged in a rear-of-cabinet, horizontal configuration to enhance its ability to withstand electrodynamic forces, which is a fundamental measure for ensuring that the main circuit of the equipment has high short-circuit withstand capability.

● The cable compartment is designed to allow convenient vertical cable entry and exit.

Device Features

● Increase the thermal capacity of the adapter to substantially reduce the additional temperature rise in connectors, cable terminations, and partition plates caused by the adapter’s own temperature rise.

● The separation between functional units and between compartments is clear and reliable, ensuring that a fault in one unit does not affect the operation of others, thereby confining the fault to the smallest possible area.

● The horizontal busbar arrangement ensures excellent dynamic and thermal stability of the equipment, enabling it to withstand the impact of a 80/176 kA short-circuit current.

● The MCC cabinet can accommodate up to 22 circuits, fully meeting the needs of automated electric door (and gate) systems in industries such as large-capacity power generation and petrochemicals.

● The connection between the equipment and external cables is made in the cable compartment, allowing cables to be routed in both vertical directions; current transformers are installed within the cable compartment, facilitating installation and maintenance.

● In a common power distribution system, current-limiting reactors can be used to limit short-circuit currents, stabilize busbar voltage within a specified range, and partially reduce the short-circuit withstand requirements for equipment and components.

● The drawer units are equipped with a sufficient number of secondary plug-in connectors (32 pairs for 1 unit or more, and 20 pairs for 1/2 unit), thereby meeting the requirements for the number of connection points in computer interfaces and automatic control circuits.

Main electrical components

● The selection of major electrical components is based on imported technologies, ensuring that domestically produced, mass-produced series can meet the high-performance requirements of the equipment.

● The main circuit breaker for the power and feeder units shall be of the AH series. Alternatively, the more advanced M series from Schneider Electric or the F series from ABB may also be selected. AH-series circuit breakers feature excellent performance, a compact design, light weight, and strong product standardization. They are relatively low in price, easy to maintain and operate, and their performance parameters fully meet the requirements of this equipment.

● For drawer units (motor control units and some feeder units), the primary circuit breakers selected are the CM1, TG, and TM30 series molded-case circuit breakers; a portion also utilizes the NZM-100A series manufactured by MOELLER. These switches feature excellent performance, a compact design, short or no arc flash, and high technical and economic efficiency, thereby meeting the requirements of this installation.

● For isolating switches and fuse-type isolating switches, select the Q series. This series features high reliability, strong breaking capacity, and the ability to implement mechanical interlocking.

● The NT series is the primary choice for fuses.

● AC contactors shall be selected from the B series and the LC1-D series.

Functional unit

● The modular height of the drawer is 160 mm. It is available in five size series: 1/2 unit, 1 unit, 3/2 units, 2 units, and 3 units. The rated current of the unit circuit is 400 A or less.

● Drawer modifications involve changes only in the height dimension, with the width and depth remaining unchanged. Drawers of the same functional unit exhibit excellent interchangeability.

● Each MCC cabinet can accommodate a maximum of 11 single-unit drawers or 22 half-unit drawers. Drawers of one unit or larger are equipped with a multi-functional back panel.

● The drawer’s incoming and outgoing cables use plug-in modules of the same specification but with varying numbers of contact blades, depending on the current rating.

● The transition between the 1/2-unit drawer and the cable compartment utilizes a backplate-type adapter, model ZJ-2.

● The transition between the unit drawer and the cable compartment shall use ZJ-1 type transition connectors of the same dimensions, either rod-type or tubular, according to current rating.

● The drawer unit is equipped with a mechanical interlocking device.

Technical Specifications