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A Detailed Comparison of GCS and GCK Low-Voltage Switchgear: Understanding the Key Differences at a Glance

Release time:

2026-05-21

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Abstract

In the selection of low-voltage switchgear, GCS and GCK are the two most common types of withdrawable switchgear. Both belong to the drawer‑type cabinet family and share a similar appearance, yet they differ significantly in structural design, technical specifications, and application scenarios. This article provides a systematic comparison of these two cabinet types across multiple dimensions, helping you make an informed choice.

I. Model Definition and Origin

GCK : G—cabinet-type structure, C—draw-out type, K—control center. Developed independently in China, it is one of the earliest drawer‑type cabinet models introduced.

GCS : G—enclosed switchgear, C—draw-out type, S—Senyuan electrical system. Developed in the mid-1990s by a joint design team from the former Ministry of Electric Power and the Ministry of Machinery, it is a Suitable for national conditions and capable of competing with imported products. A new type of low-voltage withdrawable switchgear.

In short: GCK is the “first-generation” domestically produced drawer cabinet, while GCS is the subsequently launched “upgraded and optimized version.” 。

II. Core Parameter Comparison

Comparison dimension	GCK	GCS
Minimum drawer module	Unit 1 (1E)	1/2 unit (0.5 E)
Maximum number of drawer tiers	9 floors	11th floor
Maximum number of drawers per cabinet	9 pieces (1-unit drawer)	22 units (1/2-unit drawers)
Cabinet depth	1000mm	800mm
Rated current of the horizontal busbar	≤3150A	≤4000A
Installation modulus	25mm	20mm
Rated current of the vertical busbar	1000A	1000A (Quite)
Maximum 1/2 drawer current	—	40A

III. Differences in Structural Design

1. Busbar arrangement (the most critical distinction)

GCK : The horizontal busbar is installed at Top of the cabinet , vertical busbar No flame-retardant plastic functional panel Protection. This design is relatively less secure.

GCS : The horizontal busbar adopts Late qualification Method: the vertical busbar is assembled in Flame-retardant plastic functional panel Inside, it offers enhanced safety. This design effectively prevents the propagation of fault arcs.

It should be noted that some budget‑friendly GCS products currently available on the market also place the horizontal busbar on the top of the cabinet, but… The standard-type GCS is still characterized by rear cable exit. 。

2. Drawer Push Mechanism

GCK : Relative to the propulsion mechanism Simple , the handling feels quite direct.

GCS : Adopt CJG-1~3 Rotary Propulsion Mechanism , easier to plug and unplug, and more convenient to operate

3. Cabinet Frame

GCK : Adopt C-shaped steel section Assembly

GCS : Adopt 8MF (KS) type steel Assembly, with higher strength

4. Operating Surface and Space Occupancy

GCK : Can do Double-sided operation cabinet , cabinet depth 1000mm

GCS : Can only do Single-sided operation cabinet , cabinet depth 800 mm

The advantage of GCS is its space-saving design. — With a reduced depth of 200 mm, it offers greater advantages when space in the distribution room is limited.

IV. Comparison of Applicable Scenarios

Application Considerations	GCK	GCS
Number of circuits	Less	More (Up to 22 circuits per cabinet)
Space usage	Larger (depth 1000 mm)	Smaller (800 mm deep)
High-current scenarios	≤3150A	Up to 4000A
Density of low-current circuits	General	High (1/2-unit drawer supports 40A)
Construction cost	Relatively low	Slightly higher
Interchangeability	Poor	Good

Selection Recommendation:

Choose GCK : Projects with limited budgets, few circuit traces, and modest space requirements; or specific scenarios that require double-sided operation.

Choose GCS : Projects with dense circuitry, constrained switchgear room space, requirements for 4000A high current, and a commitment to higher safety standards

V. Quick Differentiation Mnemonic

“GCK is an older model—its top busbar makes it easy to push in; GCS is an upgraded version, with 1/2‑drawer configurations that save space, a rear‑mounted busbar for enhanced safety, and an 800‑mm‑deep cabinet that takes up less floor space.”

One-look identification method:

Cabinet depth: 800 mm is GCS, and 1000 mm is GCK. (Applicable to standard products)

Minimum drawer size: can be made The one with 1/2 drawers is GCS. , the smallest unit is usually GCK.

About Hunan Electrical Appliance Co., Ltd.

Hunan Electrical Appliance Co., Ltd. As a professional manufacturer of complete electrical equipment covering the entire value chain, we also boast extensive production experience with both the GCK and GCS series of low-voltage withdrawable switchgear. Based on your project’s specific requirements—such as budget constraints, available space, number of circuits, and current ratings—we can provide the most suitable cabinet selection方案, ensuring that… No waste, no compromise, precise matching 。

Feel free to call us for inquiries or visit our factory to receive expert product selection advice and a customized quote tailored to your project.

Key words:

Why are GGD switchboards still in use? — The three irreplaceable values of fixed low-voltage switchboards

In-Depth Disassembly of MNS Low-Voltage Switchgear: A Comprehensive Analysis from the Frame to the Drawout Units

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