GGD Modular Fixed Type Low Voltage Switchgear

Definition and Core Identity

The GGD Modular Fixed Type Low Voltage Switchgear is an indoor, floor-standing, metal-enclosed switchgear assembly. It is engineered specifically for low-voltage AC power distribution in three-phase industrial and commercial electrical systems. As a foundational product in power distribution hierarchy, it sits between the transformer secondary terminals and the final branch distribution boards, functioning as the primary power hub of an installation.

Product Parameters

Certification and Quality Assurance

Lugao manufactures GGD fixed type low voltage switchgear according to project technical requirements and applicable low voltage switchgear standards. Routine inspection and test reports can be provided before shipment according to the confirmed technical agreement.

• IEC 61439-1/2 based design and testing
• GB/T 7251 based manufacturing and inspection
• Power frequency withstand test
• Insulation resistance test
• Wiring and functional operation inspection
• Temperature rise verification according to configuration
• Routine test report before shipment
• Factory inspection photos available upon request

Fixed Installation Philosophy

Unlike draw-out type switchgear where functional units can be withdrawn on slides, the GGD employs a permanently fixed mounting concept:

● All primary devices—air circuit breakers (ACBs), molded case circuit breakers (MCCBs), and isolating switches—are bolted directly onto rigid mounting plates.

● Electrical connections between devices and busbars are hard-wired using bolted copper links or cable connections, not plug-in contacts.

● This fixed approach eliminates the mechanical complexity, cost, and maintenance associated with sliding mechanisms, making it ideal for stable, long-term installations where circuit positions rarely change.

Modular Enclosure Construction

● The enclosure is built from standardized modular cubicles, each sharing the same height and depth:

● Frame dimensions: 2200mm (H) × 600/800/1000/1200mm (W) × 600/800mm (D)

● Each cubicle is an independent welded steel module that can be bolted side-by-side to form a continuous switchboard lineup.

● Cubicles are functionally classified as incoming (feeder-receiving), bus-coupler (bus interconnection), or feeder (outgoing distribution) units.

Product Advantages

Advantage 1 – Structural Robustness

The reinforced 8MF steel frame helps maintain mechanical stability under the confirmed short-circuit withstand level. Rated peak withstand current: 63kA. The cabinet frame is designed to support project-specific short-circuit withstand requirements. Rated peak withstand current can be configured according to the confirmed electrical design.

Advantage 2 – Modular & Fast Deployment

Standardized incoming, coupler, feeder cubicles. Same height/depth. Rapid project configuration by arranging standard units side by side. Reduces on-site installation time and design complexity.

Advantage 3 – Cost-Effective Lifecycle

Fixed mounting (no draw-out mechanisms) lowers initial cost. No drawer slides, plug-in contacts, or complex interlocks. Minimal maintenance, competitive total cost of ownership.

Advantage 4 – Optimized Thermal Management

Natural convection cooling: bottom louvers + top vented roof cap. Creates chimney effect – hot air rises out, cool air draws in. No fans, no noise, no extra maintenance.

Advantage 5 – Simplified Maintenance & Operation

Controls, meters, indicators on front door at ergonomic height. Breaker handles accessible without opening door. Spacious internal layout with separated busbar, breaker, cable compartments – easy visual inspection.

Product Features

Feature 1: Multi-Layer Powder Coating System

Every steel panel undergoes a five-stage pretreatment (degreasing, rinsing, phosphating, passivation, and drying) before receiving a uniform electrostatic epoxy-polyester powder coat. This coating delivers superior adhesion and humidity resistance, ensuring the GGD Modular Fixed Type Low Voltage Switchgear maintains its appearance and corrosion protection even in tropical or high-moisture industrial environments.

Feature 2:Transparent Arc Barriers

Polycarbonate barriers between main busbar and device compartments. Provides visible, physical separation for operator safety during inspection, while allowing visual confirmation of busbar condition.

Feature 3: Spacious Cable Termination Zone

● Large bottom cable compartment with open gland plate, accommodating big power cable bending radii. Adjustable cable clamps included to relieve stress on electrical connections.

Feature 4:Integrated Earthing Busbar

Continuous copper earth busbar runs full assembly length with pre-drilled points per cubicle. Simplifies on-site earth bonding for incoming and outgoing circuits, ensuring system earthing compliance.

Feature 5:External Handle with Padlock Provision

Main breaker handles externally mounted, lockable in OFF position. Enables safe mechanical LOTO during maintenance, providing clear visual isolation.

Feature 6:Flexible Busbar Configuration

Supports top/bottom cable entry, and 3P4W or 3P5W distribution. Phase busbars clearly marked with standard color coding (yellow, green, red, blue for neutral) to minimize wiring errors.

Product Application

The GGD Modular Fixed Type Low Voltage Switchgear is widely deployed across various sectors where dependable fixed distribution is prioritized:

● Building Services & Infrastructure: Staircase lighting distribution in high-rise residential towers, underground parking ventilation power supply, and municipal street lighting control cabinets.

● Industrial Auxiliary Systems: Compressor room power panels, non-critical process motor feeders in cement and aggregate plants, and factory warehouse distribution boards.

● Water & Wastewater Treatment: Pump station motor feeders for raw water intake and treated effluent discharge, and chemical dosing equipment power supply.

● Renewable Energy: AC combiner panels and auxiliary power distribution boards in ground-mounted solar farms.

● Commercial Facilities: Backup generator synchronization and distribution panels in shopping malls, and HVAC chiller feeder panels in university campus energy stations.

● Temporary & Construction Power: Site temporary power distribution boxes and construction hoist power supply panels, where fixed rugged construction offers better durability than lighter panel designs.

Packaging and Shipping

Each GGD low voltage switchgear cabinet is protected with anti-rust film, foam padding and plywood export packaging. The cabinet base can be designed for forklift handling according to shipping requirements.

Packaging: stretch film, moisture-proof protection and plywood export case

Shipping: FOB Ningbo, CIF major ports or EXW available

Cabinet fixing: internal components reinforced before shipment

Documents: packing list, wiring diagram and test report included

After-Sales Service

Technical support for installation and commissioning

Wiring diagram and layout drawing support

Spare parts guidance for breakers, meters and control components

Warranty terms according to the confirmed order agreement

Frequently Asked Questions

Q1: What is the difference between GGD fixed switchgear and GCS/MNS draw-out switchgear?

GGD uses fixed-mounted breakers and hard-wired connections, while GCS or MNS uses withdrawable drawer units. GGD is more cost-effective for stable distribution systems where circuits do not need frequent replacement.

Q2: Can the GGD cabinet be customized according to my single-line diagram?

Yes. Lugao can configure incoming, feeder, bus-coupler, metering and capacitor compensation cabinets according to your electrical diagram and component brand requirements.

Q3: What component brands can be used?

Common options include ABB, Schneider, Siemens, CHINT, Delixi or other project-specified brands, depending on budget and technical requirements.

Q4: What documents are supplied before shipment?

We can provide layout drawings, wiring diagrams, routine test reports, packing lists and product photos before shipment according to the confirmed order.