Low-Voltage Complete Switchgear Selection Guide: Comparison of Four Major Cabinet Types - GGD, GCS, GCK, MNS-Shanghai Gaosuo Electrical Co., Ltd.

Low-voltage complete switchgear is the "central nervous system" for power distribution and control in industrial and mining enterprises, commercial buildings, and infrastructure. Faced with four mainstream types – GGD, GCS, GCK, and MNS – how to make a reasonable choice based on actual needs? This article provides a full-scope comparison from structure, parameters to scenarios.

I. Overview of the Four Cabinet Types

Model	Type	Meaning	Design Features
GGD	Fixed	G - Cabinet, G - Fixed, D - Power	8MF steel frame welded structure, components fixedly mounted
GCK	Draw-out	G - Cabinet, C - Withdrawable, K - Control Center	C-channel assembly, E=25mm modular
GCS	Draw-out	G - Cabinet, C - Withdrawable, S - Siyuan design	KS-section assembly, E=20mm modular
MNS	Draw-out	M - Modular, N - Standard, S - System	C-channel, E=25mm modular, double-sided operation available

II. Core Parameter Comparison

Parameter	GGD	GCK	GCS	MNS
Rated current	1000~3150A	~4000A	~6300A	~6300A
Breaking capacity	15~50kA	~50kA	~50kA	~100kA
Minimum drawer	No drawer	1 module (200mm)	1/2 module (160mm)	1/4 module (50mm)
Circuits per cabinet	About 12	About 20	22	36~72
Operating side	Single-sided	Single-sided	Single-sided	Double-sided optional
Maintenance method	De-energize for maintenance	Hot-swappable	Hot-swappable	Hot-swappable
Protection degree	IP30	IP30	IP30	IP30~IP40

III. Selection Decision Guide

Choose GGD: Limited budget, simple circuits

Suitable for small factory workshops, building floor distribution, pump stations, and other situations with few circuits and no frequent maintenance needs. Advantages are low procurement cost and simple, reliable structure. Disadvantages are that maintenance requires de-energization and poor expandability.

Choose GCK: Power and motor control for small-to-medium factories

Balances power distribution (PC) and motor control (MCC) with good cost-effectiveness. Suitable for medium-sized factories and moderate reliability requirements. Drawer units are relatively large, and circuit density is lower than GCS/MNS.

Choose GCS: High-current, high-reliability industrial scenarios

The rear-flat busbar design gives a short-circuit withstand strength of 80kA, particularly suitable for heavy industries like petrochemical and metallurgy. The rotary push-in mechanism makes insertion and withdrawal easy with high reliability. Only single-sided operation is possible.

Choose MNS: High circuit density, intelligent management

1/4 drawers support ultra-dense distribution; double-sided operation extends cabinet depth to 1000mm. Supports IEC61850 communication protocol, enabling remote measurement, remote control, and remote signaling (three-remote functions). Suitable for data centers, airports, hospitals, and other critical locations with numerous circuits and extremely high reliability requirements.

IV. Three-Step Selection Method

Demand grading: Basic distribution → GGD; Medium industry → GCK/GCS; High-reliability intelligent → MNS
Space evaluation: If space is limited, choose MNS (600mm wide cabinet); if double-sided maintenance is needed, also choose MNS
Expansion prediction: For large production fluctuations, choose MNS drawer-type expansion; for gradual upgrades, choose GCS modular

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Low-Voltage Complete Switchgear Selection Guide: Comparison of Four Major Cabinet Types - GGD, GCS, GCK, MNS