Complete Comparison of GGD, GCK, GCS, and MNS Low Voltage Switchgear

 Structural Design and Operation

GGD: Uses 8MF cold-formed steel frame, modular mounting holes (20mm modulus), single-sided operation, IP30 protection, cabinet depth ≥800mm.
GCK: Uses C-section frame, modulus E=25mm, single-sided operation, minimum drawer unit is 1 module (200mm high).
GCS: Uses KS-section frame, modulus E=20mm, single-sided operation, minimum drawer unit is 1/2 module (160mm high), up to 11 drawers.
MNS: Uses combined C-section structure, modulus E=25mm, double-sided operation, minimum drawer unit is 1/4 module, with interlocking mechanism.

 Electrical Performance and Current Capacity

GGD rated current up to 4000A, short-circuit making current 20kA, suitable for stable power environments.
GCK maximum current up to 6300A, vertical busbar without flame-retardant board.
GCS originally designed for 4000A, improved to 6300A, cost-effective.
MNS supports double busbar system, short-circuit withstand up to 100kA, max current 6300A, compatible with smart monitoring and communication.

 Application Scenarios and Selection Guide

GGD: Ideal for PV grid-connection and fixed distribution loops, high reliability, easy maintenance.
GCK: Medium complexity scenarios, lower cost.
GCS: High automation environments like power plants and petrochemical systems, supports computer interface.
MNS: High short-circuit capacity grids, space-constrained rooms, new energy applications (PV, energy storage), compliant with IEC standards.

     GGD, GCK, GCS, and MNS each have unique strengths. Selection should be based on current requirements, space layout, operation mode, and smart capabilities. Fixed GGD offers stability, while withdrawable GCK/GCS/MNS provide flexibility and intelligence for modern power systems.