1. What Is a GGD Cabinet? (Fixed-Type Low-Voltage Switchgear)
GGD is afixed-mount, front-operated, side-accesslow-voltage distribution cabinet, with cabinet widths of 600/800/1000/1200mm and depths of 600/800mm. Compared with GCS/MNS (drawer-type), GGD components are fixed-mounted, lower cost and better heat dissipation, making it suitable for applications that do not require frequent circuit changes.
2. The 4 Tiers Inside a GGD Cabinet (Top to Bottom)
| Layer | Contents | Typical Components |
|---|---|---|
| Top: Meter Compartment | Metering and indication | Ammeter / voltmeter / selector switch / indicator light |
| Middle: Busbar Compartment | Main busbar + incoming line | TMY copper busbar 100×10, etc. |
| Middle: Breaker Compartment | Main circuit switch | Incoming MCCB or disconnect switch |
| Bottom: Outgoing Compartment | Outgoing breakers | Branch MCCB + current transformers |
3. GGD Busbar Sizing (Domestic Standard Red Line)
Golden Unicorn GGD distribution cabinet:busbar ≤ 2000A, operating voltage 380/400V(660V not included), max per section8 units in parallel. Beyond that, use a split busbar or GCS/MNS drawer-type cabinet.
4. GGD vs GCS vs MNS: How to Choose (Comparison of 3 Cabinet Types)
| Type | Installation | Advantages | Where it is used |
|---|---|---|---|
| GGD | Fixed type | Low cost, good heat dissipation, straightforward maintenance | Distribution rooms with fixed, unchanging circuits |
| GCS | Drawer type | Circuits can be swapped out, maintenance without power shutdown | Applications requiring frequent maintenance |
| MNS | Drawer type (imported system) | High standardization, good protection | Large-scale projects / foreign-invested projects |
5. GGD Selection & Dimension Table (by current)
| Rated current | Cabinet width | Cabinet depth | Busbar specification |
|---|---|---|---|
| ≤ 400A | 600mm | 600mm | TMY-40×4 |
| 400–630A | 800mm | 600mm | TMY-60×6 |
| 630–1250A | 800mm | 800mm | TMY-80×8 |
| 1250–2000A | 1000/1200mm | 800mm | TMY-100×10 |
FAQ FAQ
What does GGD mean?
GGD is the national standard cabinet type designation for low-voltage fixed-type distribution cabinets: G = fixed type, G = AC, D = distribution cabinet.
How to choose between 600mm and 800mm depth for GGD cabinets?
For busbar ≤ 630A, 600mm depth is sufficient; for ≥ 630A or when large maintenance space is needed, choose 800mm depth.
Can GGD be used as a VFD panel?
Yes, but VFDs generate significant heat and require cooling fans or a separate VFD panel enclosure. It is not recommended to fit them into a standard GGD.
What certifications are needed for GGD export?
CE (LVD+EMC) is the minimum requirement for the EU. Golden Unicorn GGD has passed CE + ISO 9001 and can provide IP65 test reports.
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