⑴ Operational differences: The GGD is easier to distinguish from the other three models. The GGD is a fixed-type switchgear, whereas the GCK, GCS, and MNS are all drawer-type switchgear cabinets. Each outgoing circuit unit in these cabinets is independent, and there is no mutual interference between different circuits. Most of the switchgear currently produced have incorporated the advantages of the GCS cabinet. What clearly distinguishes it from the GCS and MNS is its main busbar: the GCS, developed in the mid-1990s by Qianwei Electric Appliances of Ningbo City based on the ABB MNS cabinet design, is a new-generation drawer-type switchgear whose main structural features are similar to those of the MNS, with the main busbar positioned at the rear.

 

⑵ Different module sizes: The drawer modules use the commonly adopted 20 mm module in China (while MNS uses a 25 mm module). The drawers are equipped with a push-in mechanism, making operation more convenient and flexible. MNS cabinets can be operated from both sides, and a single cabinet can accommodate up to 36 circuits (with 1/4-size drawers), whereas GCS cabinets can accommodate at most 22 circuits. The material used for the MNS cabinet body is aluminum-zinc coated steel sheet, featuring an all-assembled structure that requires no post-processing (such as galvanization). Both MNS and GCS cabinets have horizontal busbars arranged such that the rear-outlet section is separated from the front-left drawer units and the front-right cable outlet compartment by partitions. Their vertical busbars are assembled within flame-retardant plastic functional panels, enhancing reliability. The key difference lies in the minimum drawer size: GCS allows only 1/2-size drawers, while MNS offers 1/4-size drawers. Moreover, MNS drawers are equipped with an additional interlocking mechanism, whereas GCS relies solely on the switch itself for interlocking.

 

⑶ Different numbers of units: In the GCK, the horizontal busbar is traditionally located at the top of the cabinet, and the vertical busbars do not have flame-retardant plastic functional panels. Cable outlets can be either rear-mounted or configured in the right-side cable compartment. However, the drawer-coupling mechanism differs from those used in GCS and MNS—it is relatively simpler. According to the requirements for 3C mandatory certification test cabinets: the minimum drawer unit modulus for GCK is one module; for GCS, it is half a module; and for MNS (using imported ABB technology), it is one-quarter of a module.