1. What Is Modular Low Voltage Switchgear & Distribution Cabinet?
Modular low voltage switchgear, also called low voltage distribution cabinet, is a complete set of indoor AC 400V power distribution equipment complying with IEC 60439 and GB 7251 international & national standards. It undertakes power receiving, distribution, protection, measurement and control tasks for low-voltage power systems below 1kV, widely matched with KYN28-12 medium voltage switchgear, SF6 ring main unit, dry type and oil immersed transformers to form a complete medium-low voltage power distribution system.
Our factory’s full series low voltage cabinets cover three mainstream modular frameworks: fixed type GGD, withdrawable MNS and compact draw-out GCS. All cabinets adopt fully modular splicing structure, standard busbar compartment, functional unit compartment and cable compartment separated by metal partitions, with protection grade IP30~IP54 optional according to indoor, semi-outdoor and workshop corrosive environments.
Different from simple assembled distribution boxes, full series low voltage switchgear integrates circuit breakers, contactors, relays, energy meters, reactive power compensation modules and intelligent monitoring components in one cabinet. The standardized modular unit design allows free combination of incoming cabinets, outgoing feeder cabinets, capacitor compensation cabinets and metering cabinets, adapting to power distribution demands of all types of projects. All products pass full type tests and obtain CE certification, supporting export to Europe, Southeast Asia, the Middle East and Australia.
2. Three Main Full Series Low Voltage Switchgear Models & Features
We produce three mainstream modular low voltage distribution cabinet series for different project scenarios, each with unique structural advantages:
2.1 GGD Fixed Low Voltage Distribution Cabinet
GGD is the most cost-effective fixed-type low voltage switchgear, widely used in general industrial plants, residential districts, municipal substations and small photovoltaic power stations.
- Core advantages: Welded integral frame, strong mechanical stability, low manufacturing cost, simple maintenance;
- Structure feature: All functional units are fixed installation, suitable for projects with low maintenance frequency and limited budget;
- Rated parameter: Rated current up to 3150A, short-circuit withstand current 15kA~50kA;
- Application scope: Small and medium factories, community power rooms, highway service stations.
2.2 MNS Withdrawable Modular Low Voltage Switchgear
MNS is a universal multi-functional draw-out LV switchboard, the preferred product for large industrial parks, data centers, hospitals and new energy power stations with high power supply reliability requirements.
- Core advantages: 1/4, 1/2, 1 full size withdrawable functional drawers, zero power outage replacement of faulty units; independent compartment for each drawer to prevent fault spread;
- Structure feature: Modular vertical busbar, horizontal distribution busbar, double-layer separation design; optional motorized drawer and intelligent monitoring module;
- Rated parameter: Maximum rated current 4000A, short-circuit resistance up to 80kA;
- Application scope: Large manufacturing workshops, ground photovoltaic power stations, data center basement power rooms, shopping malls.
2.3 GCS Compact Draw-out Low Voltage Switchgear
GCS compact cabinet optimizes cabinet depth and width on the basis of MNS, more suitable for narrow indoor power distribution rooms and compact box-type substations.
- Core advantages: Small footprint, high unit density, flexible combination of small current feeders;
- Structure feature: Front operation and front maintenance design, no reserved back maintenance space;
- Rated parameter: Rated current range 630A~3150A;
- Application scope: Compact kiosk substations, underground tunnel power distribution, commercial building basement narrow power rooms.
3. Universal Core Advantages of Our Full Series LV Switchgear
3.1 Strictly Compliant With IEC & GB Dual Standards
All our low voltage distribution cabinets follow both international IEC 60439 and Chinese GB 7251 standards. The busbar adopts tin-plated copper bar to reduce contact resistance; insulating parts use flame-retardant ABS material with high temperature resistance. Complete test reports including temperature rise test, short-circuit withstand test and insulation test can be provided for tender and customs clearance.
3.2 High Safety Partition Modular Structure
The cabinet body is divided into independent busbar chamber, functional unit chamber and cable chamber by steel partition plates. Once short-circuit or arc fault occurs in one unit, the high-temperature arc will be blocked inside the independent compartment, avoiding chain failure of the whole power distribution system. The cabinet door is equipped with mechanical interlock, and the door can only be opened after cutting off the main power supply to prevent accidental electric shock.
3.3 Strong Environmental Adaptability
We provide multiple protection grades: IP30 for dry indoor power rooms, IP44 for workshop with slight dust, IP54 for semi-outdoor box substation. The surface of the cabinet adopts electrostatic spraying anti-corrosion process, which can resist mild salt fog and chemical gas corrosion, suitable for coastal industrial parks and chemical factories. Customized high-altitude reinforced type is available for areas above 3000m altitude.
3.4 Intelligent Upgrade Support
All series reserve secondary wiring space for intelligent modules: real-time temperature monitoring, residual current fire protection, remote DTU communication, power quality monitoring and reactive power automatic compensation controller. It can connect to SCADA system to realize unattended intelligent power distribution, matching the construction requirements of smart factories and smart city distribution networks.
3.5 Flexible OEM & Modular Combination
The modular design supports arbitrary collocation of incoming, outgoing, metering and compensation cabinets. We customize cabinet size, surface color, brand logo, primary circuit scheme and secondary control logic according to customer project one-line diagram. For overseas distributors, we provide private label, multi-language technical drawings and packaging optimization services.
4. Main Application Scenarios of Low Voltage Distribution Cabinet
4.1 Industrial Manufacturing Plants & Industrial Parks
Heavy industry factories, textile workshops, food processing bases and chemical parks use MNS and GGD low voltage switchgear as terminal power distribution equipment. The large-current carrying capacity meets the power demand of motors, compressors and production lines; the drawer-type design of MNS ensures continuous production without long-time power failure during equipment maintenance.
4.2 Photovoltaic & Wind New Energy Power Stations
Centralized ground PV stations, distributed rooftop solar and wind farm collector stations are equipped with low voltage compensation and distribution cabinets. The built-in reactive power compensation module stabilizes power factor, reduces grid electricity charge penalties, and matches medium voltage KYN28-12 switchgear to form a complete power collection system.
4.3 Commercial & Public Infrastructure
Shopping malls, hospitals, metro stations, airports, schools and data centers install MNS draw-out low voltage cabinets in basement power rooms. The independent drawer isolation design improves power supply stability, avoiding large-area power outages affecting public service operation.
4.4 Municipal & Residential Construction
Urban community substations, residential buildings, water conservancy pumping stations and highway service stations mostly select cost-effective GGD fixed distribution cabinets. The simple structure reduces later maintenance costs and meets the daily power demand of residents and public facilities.
4.5 Compact Box-Type Substation Supporting
GGD and GCS compact low voltage cabinets are the standard matching equipment for box-type substations. The small-size GCS cabinet saves the internal space of the box body, and forms a complete power distribution unit together with SF6 ring main unit and distribution transformer.
5. Selection Guide: How to Choose Suitable Low Voltage Switchgear
- Budget & maintenance frequency: Choose GGD fixed cabinet if the project budget is limited and maintenance frequency is low; select MNS withdrawable cabinet for high-reliability projects requiring frequent maintenance.
- Power room space: If the power room is narrow and only front maintenance space is reserved, GCS compact cabinet is the best choice; MNS needs enough back maintenance passage.
- Load capacity: Projects with total load over 3150A prioritize MNS series with higher busbar carrying current.
- Environment condition: Coastal, semi-outdoor or dusty workshops need IP44/IP54 high protection grade customized cabinets.
- Intelligent demand: Data centers and smart factories recommend MNS with reserved intelligent monitoring module installation positions.
6. Why Buy Full Series Low Voltage Switchgear From Our 15-Year Factory
- Complete production line: Independent sheet metal workshop, busbar processing workshop and assembly workshop, all links controlled in-house to guarantee product quality;
- Standard modular molds: Mass production of GGD, MNS, GCS three series, standard models delivery cycle only 7–15 working days;
- One-stop supporting service: We supply matching medium voltage cabinets, transformers and EV charging piles together to provide integrated power distribution solutions;
- Complete export certification: CE, ISO9001 certification, full set of factory inspection reports, type test documents for customs clearance;
- Global after-sales support: Provide remote installation guidance, operation training videos and long-term supply of circuit breaker, contactor and monitoring spare parts.
