Power Distribution Panels
LV Switchgear (MNS / GCS / GCK Drawer-Type & GGD Fixed) | UniRegal
Factory LV switchgear: drawer-type MNS, GCS and GCK motor-control and power centers plus fixed GGD boards, 380-660 V, 50 Hz, main bus to 6300 A.
Specifications
- Types
- MNS / GCS / GCK drawer-type; GGD fixed-type
- Rated working voltage
- GCK 380 V; GCS 400/660 V; MNS 380/660 V; GGD 380 V (main circuits)
- Rated frequency
- 50 Hz (MNS also rated 50/60 Hz)
- Main busbar
- To 6300 A (GCK); 1600-4000 A horizontal bus (MNS); to 4000 A horizontal, 1000 A vertical (GCS)
- Short-time withstand
- To 100 kA (GCK); 50/80 kA (MNS); 80 kA (GCS); 15/30/80 kA (GGD tiers)
- Peak withstand
- To 220 kA (GCK); 105/176 kA (MNS)
- Drawer units
- GCS: 1/2 to 3 unit sizes, up to 11 units or 22 half-units per section
- Drawer positions
- GCS: five marked working positions with mechanical interlocks and emergency release
- Modular frame
- GCK: 20 mm module holes; MNS: E=25 mm modular system
- Enclosure protection
- IP30-IP40 (IP32 for GCK)
- Cable entry
- Top, bottom or side cable entry (GGD); bottom cable outlets (GCK)
- Standards
- IEC 60439-1 / IEC 439-1, GB 7251.12 design basis
Low Voltage Switchgear for Plant Power Distribution and Motor Control
Low-voltage switchgear is the assembly that receives power from the transformer or generator at 380-660 V and distributes it to feeders, motors, and process loads. It is also where an operator isolates a failed circuit without shutting the plant down. UniRegal supplies factory-assembled LV switchgear in four families—drawer-type MNS, GCS, and GCK assemblies plus fixed-type GGD boards—engineered around your single-line diagram, load schedule, and site conditions.
Quick Answer: Drawer-Type or Fixed-Type LV Switchgear?
Drawer-type switchgear (MNS, GCS, GCK) houses each circuit in a withdrawable unit that can be pulled out for maintenance, testing, or replacement while the rest of the board stays energized. Fixed-type switchgear (GGD) has permanently wired compartments, costs less for a given rating, and suits circuits that rarely change. If your loads are motors, pumps, fans, or process equipment that must keep running during service work—or if your plant will grow—choose drawer-type. If the board is a simple radial distribution with stable feeders, fixed-type usually gives the lowest installed cost.
What Is a Drawer-Type (Withdrawable) LV Switchgear Assembly?
In a drawer-type assembly each outgoing circuit—motor starter, feeder, or control unit—lives in its own withdrawable drawer. The drawer connects to the vertical busbar through plug-in contacts and moves through clearly marked working positions—test, disconnected, withdrawn and isolated (GCS series), or connected, test and separated (MNS series)—with mechanical interlocks that prevent withdrawing or inserting a closed breaker. When a unit fails, a maintenance electrician withdraws that drawer, fits a spare or repaired unit, and restores the circuit in minutes—without de-energizing the section or touching the live busbar.
A single GCS section holds up to 11 unit drawers or 22 half-unit drawers in a five-drawer-size series from 1/2 unit to 3 units, which is why drawer assemblies are the standard choice for motor control centers where many small starters share one board.
MNS - Modular Drawer-Type Switchgear (E=25 mm)
The MNS assembly uses an E=25 mm modular frame, so standard functional units combine flexibly inside one board. The horizontal busbar is rated from 1600 A to 4000 A with 50/80 k. A short-time withstand, vertical busbar 1000 A, and peak withstand 105/176 kA. Drawers sit in clearly marked connected, tested, and separated positions with mechanical interlocks. Enclosure protection is IP30 or IP40. It suits power distribution and motor control centers in utilities, factories, buildings, and municipal systems and is designed to the IEC 439-1 / IEC 60439-1 and GB 7251.12 requirements.
GCS - Drawer-Type Power and Motor Control Centers
GCS assemblies are built for high-density motor control and power distribution: horizontal busbar to 4000 A, vertical busbar 1000 A, short-time withstand 80 kA, with separate functional compartments so one unit does not affect its neighbor. Five drawer sizes (1/2, 1, 3/2, 2, and 3 units) cover circuits up to 400 A in a section of up to 11 full units or 22 half-units. Drawers have five working positions with visible indication and emergency release. Typical enclosure protection IP30/IP40; dimensions 2200 mm high by 400-1000 mm wide by 600-1000 mm deep.
GCK / GCK(L)—High-Current Drawer-Type Centers
GCK(L) is the high-capacity member of the family: main busbar to 6300 A, peak withstand to 220 kA, and short-time withstand to 100 kA, on a 20 mm module-hole frame with aluminum slide rails and screw-type insertion for light, positive drawer operation. Enclosure protection IP32. The same family assembles into GCL power centers, GCK motor control centers, and metering, lighting, or power-factor-compensation distribution units—a useful option when one manufacturer should cover both the incoming power center and the MCC.
What Is a Fixed-Type GGD LV Distribution Board?
GGD boards are fixed, non-withdrawable assemblies for 380 V power, lighting, and distribution duty. The bolted modular frame and all structural parts are phosphated and finished with polyester textured powder coating; uncoated parts are galvanized and passivated. The design uses natural ventilation, offers IP30 as standard with IP20-IP40 options for site conditions, and supports incoming cable from the top, bottom, roof, left, center, or right so it fits almost any switchroom layout. GGD is produced in three short-circuit tiers—15 kA, 30 kA, and 80 kA (1s)—with matching peak ratings, so you pay for exactly the fault level your network requires.
Choose the Right LV Switchgear for Your Project
Answer these six questions before requesting a quotation, and the board type, busbar rating, and enclosure class decide themselves:
1. What is the incoming transformer or generator rating and the calculated demand? This sets the main busbar size - up to 4000. A covers most MNS/GCS installations; choose the GCK 6300 A class for very large power centers.
2. What is the prospective short-circuit level at the board? Match the board tier (for example, GGD 15/30/80 kA, MNS/GCS 50/80 kA, or GCK to 100 kA) to the network fault level stated by the utility or your engineer.
3. Do the loads include motors that must keep running while others are serviced? Motor control centers with withdrawable starters are the reason to choose drawer-type MNS, GCS, or GCK.
4. Will the board change over its life—new feeders, bigger motors, repurposed sections? Drawer units make later changes and additions cheaper and safer.
5. Where will the board be installed? Indoor electrical rooms are typically IP30-IP40; confirm the environment (dust, humidity, washdown) before fixing the enclosure class.
6. What must the board contain beyond feeders—metering, power-factor compensation, bus-coupler, or standby incomer sections? State these in the single-line diagram; GCK can additionally integrate metering, lighting, and compensation sections in the same family.
Key Specifications to Check Before Purchase
Voltage and Frequency
Confirm the system voltage matches the family: GCK main circuits 380 V, GCS 400/660 V, MNS 380/660 V, GGD 380 V. State your nominal frequency in the inquiry—MNS is documented for 50 and 60 Hz, and the family rating is confirmed against your network.
Busbar Rating and Fault Withstand
Ask for three numbers in every quotation: main and vertical busbar current rating, short-time withstand current, and peak withstand current. They determine whether the board survives the network's worst-case fault and how much load it can carry in the future.
Drawer Positions and Interlocks
A safe drawer assembly shows clear connected/test/disconnected positions, mechanical interlocks, position indication, and an emergency release—not just a removable chassis. These features decide how fast and how safely your maintenance team can work on a live board.
Enclosure Protection and Environment
Match the IP class (IP30-IP40 depending on family; IP32 standard for GCK) to the room: clean indoor rooms differ from dusty plants or outdoor cubicles. If the board is outdoors, say so—the enclosure, finish, and ventilation change with it.
Standards and Documentation
The assemblies are designed to the IEC 439-1 / IEC 60439-1 and GB 7251.12 requirements. Tell us if your project references additional project- or client-specific standards so the proposal includes the right drawing and test package.
Where LV Switchgear Is Used
Drawer-type assemblies are the workhorse of motor-intensive plants: pumping stations and water/wastewater treatment, HVAC and chiller plants, food and beverage lines, manufacturing and packaging machinery, and compressors and conveyors—anywhere dozens of motors share one electrical room. Fixed GGD boards appear as plant incoming and distribution boards, building main boards, and utility or infrastructure panels where feeders are stable. Both families commonly sit with metering, power-factor compensation, and bus-coupler sections in the same switchroom.
Quality, Testing, and Factory Evidence
Quality claims are only as good as the inspection behind them. The factory operates an ISO 9001-certified quality management system with a three-stage inspection routine—incoming material and component checks, in-process inspection during fabrication and assembly, and outgoing inspection of every finished assembly before packing.
The electrical test line covers the checks that matter for LV switchgear: a 100 kV-class AC/DC high-voltage withstand test set (applied at the routine test voltages for each family), insulation-resistance and earth-resistance testers, a loop (contact) resistance tester for busbar joints, a DC resistance rapid tester, a switch mechanical-characteristic tester for drawer mechanisms and interlocks, and a primary current injection test set for protection checks. Routine inspection records are available on request with your order.
What to Send for an LV Switchgear Quotation
To return a section layout, busbar rating, and price, our engineers need: (1) the single-line diagram or a feeder list with load kW and starting method for motors; (2) nominal voltage, earthing system (TN-S / TN-C-S / TT) and frequency; (3) incoming supply rating and short-circuit level if known; (4) enclosure location (indoor/outdoor, IP class required); (5) whether future feeders are planned—if yes, choose drawer-type now. No single-line diagram yet? Send a load schedule and we will suggest a typical arrangement to comment on.
Frequently Asked Questions
1. What is the difference between MNS, GCS, GCK, and GGD switchgear?
MNS, GCS, and GCK are drawer-type (withdrawable) assemblies—circuits can be pulled out for service while the board stays live; they differ in frame system and capacity (MNS E=25 mm to 4000 A, GCS to 4000 A high-density units, and GCK to 6300 A). GGD is fixed-type: lower first cost, simpler construction, and natural ventilation, and it is used where feeders rarely change.
2. Can a motor control center also serve as the main distribution board?
Yes - the same family combines incoming, bus-coupler, feeder, metering and compensation sections. GCK(L) in particular is designed to assemble as power centers (GCL), motor control centers and metering or compensation units, so one consistent board line covers the switchroom.
3. How do I know which short-circuit rating my board needs?
The board's short-time withstand must be at least the prospective fault current at its busbar, which your utility or electrical consultant can state from the transformer size and network impedance. Send us that figure; we will select the matching tier (GGD 15/30/80 kA, MNS/GCS 50/80 kA, GCK to 100 kA).
4. Can the board include power factor correction?
Yes. Drawer-type assemblies (GCK especially) can integrate capacitor and compensation sections, and fixed GGD enclosures are a common host for compensation units. Tell us the target power factor and the load profile so the kvar step sizing is included in the same board.
5. Do you build to IEC standards or client specifications?
The assemblies are designed to IEC 439-1 / IEC 60439-1 and GB 7251.12 requirements. If your project references additional standards or requires a specific component brand list, include it with the enquiry and we will confirm feasibility before quoting.
6. How is the switchgear documented and shipped?
Assemblies are factory-assembled, checked and documented before shipment - arrangement drawings, schematic and wiring documentation and a pre-shipment check per the agreed scope. Confirmed delivery time is stated in the proposal after engineering review of your single-line diagram.
7. What testing does each assembly pass before shipment?
Finished assemblies pass the factory's outgoing inspection under its ISO 9001 system - workmanship, wiring, marking, and the electrical routine checks for the family (insulation and withstand tests, resistance and mechanical-operation checks as applicable). Ask for the routine inspection record with your quotation, and tell us if your project requires witness testing or third-party inspection so it is planned before production.
Request a Low Voltage Switchgear Quote
Send us your single-line diagram and load schedule - or just a description of the plant and its motors. Our engineers will confirm the board type, section layout, busbar and withstand ratings, enclosure class and delivery time before you commit. Use the contact form, or mention your WhatsApp number in the message - most inquiries receive a response within 24 hours.