Low Voltage Distribution Cabinet
The Low Voltage Distribution Cabinet is an essential power management solution engineered for safe, reliable, and efficient electricity distribution in low-voltage systems. Designed for both indoor and outdoor applications, it organizes and protects electrical circuits while providing flexible feeder management for lighting, power outlets, motors, and auxiliary equipment. With robust construction and intelligent design, this cabinet minimizes energy losses, enhances system safety, and supports easy expansion in commercial, industrial, and infrastructure projects. Featuring high-performance circuit breakers, precision busbar systems, and comprehensive protection devices, the cabinet delivers superior short-circuit resistance, overload protection, and leakage prevention. Its modular layout allows for quick configuration changes and maintenance. Advanced options include digital metering, remote monitoring, and automatic transfer capabilities, making it ideal for modern smart grid integration. This distribution cabinet ensures stable power supply, reduces operational risks, and complies with the latest international electrical standards.
- Primary Voltage Ratings 220V / 380V / 400V / 415V / 690V
- Type Switchgear
- Standards IEC 61439 / IEC 60947 / ANSI / IEEE
- Application hospitals, data centers, petrochemical facilities
- Power Rating --
- Certificate UL, CESI, IEEE
- Cooling Method ONAN / ONAF
Technical Specifications
Customization Optional
Packing and Shipping
Manufacturer Test
Routine Testing
Application
Technical Specifications
Low Voltage Distribution Cabinet
Low Voltage Distribution Cabinet Data Sheet
| Parameter | Specification |
| Product Type | Low Voltage Distribution Cabinet |
| Rated Voltage | 220V / 380V / 400V / 415V / 690V |
| Rated Frequency | 50Hz / 60Hz |
| Rated Insulation Voltage | Up to 1000V |
| Rated Current | 400A – 7500A |
| Rated Short Circuit Withstand Current | 35kA – 120kA |
| Main Busbar Rated Current | Up to 7500A |
| Busbar Material | Electrolytic Copper / Aluminum |
| Incoming Breaker Type | ACB / MCCB |
| Outgoing Feeder Type | MCCB / MCB |
| Protection Functions | Overload / Short Circuit / Earth Fault |
| Power Distribution Type | Fixed / Modular |
| Form of Separation | Form 2 / Form 3 / Form 4 |
| Cabinet Material | Galvanized Steel / Stainless Steel |
| Surface Treatment | Electrostatic Powder Coating |
| Protection Degree | IP30 / IP40 / IP54 / IP65 |
| Metering System | Digital Multifunction Meter |
| Intelligent Monitoring | SCADA Compatible |
| Communication Protocol | Modbus / Profibus / Ethernet |
| Cable Entry Method | Top / Bottom Entry |
| Cooling Method | Natural Ventilation / Forced Air |
| Operating Temperature | -25°C to +55°C |
| Relative Humidity | ≤ 95% RH |
| Installation Altitude | ≤ 5000m |
| Seismic Resistance | Up to 8 Degree |
| Service Life | More than 30 Years |
| Applicable Standards | IEC 61439 / IEC 60947 / ANSI / IEEE |
Customization Optional
Low Voltage Distribution Cabinet
The Low Voltage Distribution Cabinet can be extensively customized according to project electrical load requirements, power distribution architectures, environmental conditions, and industrial automation standards. Customers may select different breaker capacities, busbar ratings, feeder configurations, and compartment layouts depending on operational demands and facility infrastructure requirements. The cabinet can additionally integrate motor control units, variable frequency drive systems, automatic transfer switches, capacitor compensation systems, harmonic filtering devices, intelligent metering modules, and digital protection relays for advanced energy management and electrical automation applications. Optional intelligent monitoring systems, remote communication interfaces, and automatic fault diagnosis functions further improve operational reliability and simplify maintenance procedures for industrial and commercial electrical networks.
The enclosure structure and internal electrical configuration can also be optimized for manufacturing plants, commercial complexes, utility substations, renewable energy facilities, petrochemical installations, transportation infrastructure, and high-humidity operating environments. Optional features include anti-condensation heaters, thermal monitoring systems, intelligent ventilation devices, arc flash protection structures, fire-resistant compartment partitions, and smart-grid communication modules for advanced digital integration. Customers may further customize cabinet dimensions, cable routing directions, enclosure colors, busbar arrangements, branding labels, maintenance access structures, and automation control systems to improve installation flexibility and operational efficiency. These advanced customization capabilities ensure the low voltage distribution cabinet can fully adapt to modern industrial automation systems and intelligent electrical infrastructure projects.
Packing and Shipping
Low Voltage Distribution Cabinet
The Low Voltage Distribution Cabinet is packaged using industrial heavy-duty export protection methods to ensure safe transportation, secure storage, and reliable international shipment under demanding logistics conditions. Prior to packaging, the complete cabinet assembly undergoes structural inspection, enclosure sealing verification, anti-corrosion coating assessment, and electrical component protection procedures to minimize transportation risks and environmental exposure. Sensitive electrical devices including intelligent relays, communication modules, digital metering systems, PLC controllers, and monitoring interfaces are additionally protected using moisture-proof and vibration-resistant industrial packaging materials.
Each distribution cabinet is internally reinforced using transportation locking systems and heavy-duty support structures to prevent component movement during road, railway, or sea transportation. Busbar systems, circuit breakers, cable compartments, auxiliary control devices, and intelligent monitoring components are securely fixed to reduce vibration impact and preserve assembly integrity throughout shipment operations. External cabinet surfaces are protected using industrial waterproof wrapping film, reinforced edge guards, anti-scratch covers, and impact-resistant fastening systems to maintain enclosure quality during long-distance transportation and warehouse storage.
Depending on project dimensions, transportation conditions, and customer logistics requirements, the low voltage distribution cabinet may be shipped using steel-frame export packaging, skid-mounted transportation systems, fumigation-free wooden crates, or direct container securing structures compliant with international logistics standards. Additional anti-condensation packaging solutions, anti-vibration reinforcement measures, and marine-grade corrosion protection systems are available for offshore projects, coastal installations, mining operations, and remote infrastructure facilities requiring extended transportation durations and complex logistics coordination.
Shipping documentation generally includes factory inspection certificates, electrical schematics, operation manuals, packing lists, wiring diagrams, export compliance certificates, and quality inspection reports. Customers may additionally request multilingual labels, customized shipping marks, installation guidance manuals, and project-specific logistics coordination support. The complete packing and shipping process is designed to maintain equipment reliability, reduce transportation risks, and ensure safe delivery to the final installation destination while preserving electrical and mechanical integrity.
Each distribution cabinet is internally reinforced using transportation locking systems and heavy-duty support structures to prevent component movement during road, railway, or sea transportation. Busbar systems, circuit breakers, cable compartments, auxiliary control devices, and intelligent monitoring components are securely fixed to reduce vibration impact and preserve assembly integrity throughout shipment operations. External cabinet surfaces are protected using industrial waterproof wrapping film, reinforced edge guards, anti-scratch covers, and impact-resistant fastening systems to maintain enclosure quality during long-distance transportation and warehouse storage.
Depending on project dimensions, transportation conditions, and customer logistics requirements, the low voltage distribution cabinet may be shipped using steel-frame export packaging, skid-mounted transportation systems, fumigation-free wooden crates, or direct container securing structures compliant with international logistics standards. Additional anti-condensation packaging solutions, anti-vibration reinforcement measures, and marine-grade corrosion protection systems are available for offshore projects, coastal installations, mining operations, and remote infrastructure facilities requiring extended transportation durations and complex logistics coordination.
Shipping documentation generally includes factory inspection certificates, electrical schematics, operation manuals, packing lists, wiring diagrams, export compliance certificates, and quality inspection reports. Customers may additionally request multilingual labels, customized shipping marks, installation guidance manuals, and project-specific logistics coordination support. The complete packing and shipping process is designed to maintain equipment reliability, reduce transportation risks, and ensure safe delivery to the final installation destination while preserving electrical and mechanical integrity.
32
32 years of industry experience
Manufacturer Test
Low Voltage Distribution Cabinet
Progress Test
Progress testing of the Low Voltage Distribution Cabinet occurs at critical production stages to maintain consistent quality. Early inspections cover material verification, dimensional accuracy of enclosures, and weld integrity. Busbar connections are torque-tested and continuity-checked. Wiring layouts undergo point-to-point verification and insulation resistance measurements. Partial assembly tests evaluate the mechanical stability of doors, locks, and mounting rails. Component installation (breakers, meters) is validated against design drawings for correct placement and secure fixing. Later stages include high-voltage dielectric testing, functional checks of protective devices, and simulation of operational loads. Communication interfaces and monitoring modules are loop-tested for data accuracy. Mechanical endurance tests on moving parts and final visual audits ensure compliance. All results are digitally recorded, with non-conformances addressed through corrective actions and retesting. These structured progress tests confirm the cabinet’s safety, reliability, and readiness for final acceptance.
Design Tests
All transformers will be tested after finishing the production, test items as follows:
♦ Insulation Power Factor
♦ Ratio, Polarity, and Phase Relation
♦ Winding Resistance
♦ Impulse Tests
♦ On load Loss Test
♦ No Load Loss Test
♦ Transformer Turns Ratio/TTR (All Tap Voltages)
♦ Impedance Voltage & Load Loss (Rated Voltage)
♦ Polarity, 1-Ph / Phase Relation, 3-Ph (Rated Voltage)
♦ Excitation & No-Load Loss (Rated Voltage)
♦ Insulation Resistance (Rated Voltage)
♦ Temperature Rise
♦ Dielectric Withstand (Hipot)
Factory Acceptance Test
Factory Acceptance Testing for transformers associated with Low Voltage Distribution Cabinets includes detailed routine examinations. Visual inspection verifies construction quality and nameplate data. Turns ratio, polarity, and vector group tests confirm electrical accuracy. Insulation resistance and power frequency withstand tests validate dielectric performance. No-load and load loss measurements assess efficiency, while temperature rise tests simulate real operating conditions using precision instruments. Further tests encompass partial discharge analysis, noise level measurement, and oil dielectric assessment for oil-immersed units. Functional integration testing with the distribution cabinet covers protection coordination and signaling. Comprehensive reports include performance curves, calibration certificates, and as-built documentation. These rigorous tests ensure reliable voltage transformation and seamless operation within the overall low voltage distribution system.
Routine Test - Circuit Breaker Timing & Motion Analysis
Purpose of Testing
Evaluate the integrity of the main circuit insulation and contact connections. Identify potential defects such as moisture ingress, aging, or contamination in the insulation system, and verify that contact resistance is within acceptable limits to prevent overheating.
Testing Equipment
For Insulation Resistance: Megohmmeter (typically 2500V or 5000V DC).For Circuit Resistance: Micro-ohmmeter (DC resistance tester) or Precision DC current source.Auxiliary Tools: Thermometer/hygrometer (for temperature correction).
Pre-Test Preparation
Ensure the switchgear is de-energized, isolated, and properly grounded. Clean the test terminals and bushings to remove dust or moisture. For insulation tests, discharge all capacitive loads (cables, busbars) thoroughly through the grounding switch or shorting links.
Test Progress
1. Insulation Test: Connect the megger leads to the busbar phases and ground. Apply the test voltage (e.g., 2500V DC) and hold for 1 minute.2. Circuit Resistance Test: Connect the micro-ohmmeter current leads to the main busbar or circuit breaker terminals. Pass a low DC current (e.g., 100A) and record the voltage drop.
Temperature Correction
Correct the measured insulation resistance to a standard reference temperature (typically 20°C) using the appropriate exponential formula to ensure compliance with standards across different ambient conditions.
Circuit Resistance Test
Connect the tester leads to the main busbar or circuit breaker terminals. Pass a low DC current (e.g., 100A or 200A as per standard) and accurately record the voltage drop across the connection point. Ensure the equipment is energized only if it complies with specific hot-line testing safety protocols, otherwise perform cold-resistance measurement after de-energization
Mechanical Characteristic Test
Purpose: To verify the operational performance and timing of the circuit breaker mechanism, ensuring compliance with speed and travel requirements for arc extinction.Procedure: Use a dedicated Circuit Breaker Mechanical Tester. Connect the tester to the control circuit (closing/opening coils) and the secondary side of the travel transducer. Perform several opening and closing operations without load. Record key parameters: Opening/Closing time, Synchronization between three phases, Travel distance, Overshoot, and Contact pressure.
Power Frequency Withstand Test (AC Hipot)
Purpose: To validate the integrity of the main insulation system under high voltage stress.Equipment: AC high voltage test set.Procedure: Energize the equipment and apply the specified power frequency test voltage (e.g., 42kV for 1 minute for 10kV switchgear) between phases/inter-phase and ground. Monitor the leakage current. The test is considered passed if the insulation does not break down and the current remains stable within the standard limit. (Note: This is a destructive test; perform only on de-energized and properly discharged equipment).
Partial Discharge (PD) Measurement
Purpose: To identify internal insulation defects such as voids, cracks, or contamination that are not detectable by insulation resistance tests.Procedure: Inject the test voltage up to 1.3~1.5 times the rated voltage. Use a PD detector connected to the coupling capacitor or directly to the test object to measure the apparent charge (pC). Ensure the background noise level is below the detection threshold. Analyze the PD patterns to locate the faulty chamber.
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
Ideal for data centers ensuring uninterrupted power to servers, hospitals with critical medical equipment distribution, wastewater treatment plants operating pumps and blowers, and renewable energy sites connecting solar or wind inverters. Versatile for infrastructure projects and large-scale retrofitting applications.
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
Product Packaging
Transformers Packaging (1)
Transformers Packaging (2)
Transformers Packaging (3)
Transformers Packaging (4)
Transformers Packaging (5)
Transformers Packaging (6)
Transformers Packaging (7)
Transformers Packaging (8)
Related Products
SVR-3 Type Feeder Automatic Step Voltage Regulator
The SVR-3 Type Feeder Automatic Step Voltage Regulator is an advanced, three-phase on-load automatic voltage regulation system designed specifically for distribution feeders. Equipped with a high-speed motorized on-load tap changer, premium copper windings, and low-loss silicon steel core, it delivers precise and rapid voltage stabilization with minimal waveform distortion. The intelligent microprocessor controller continuously monitors line voltage and automatically adjusts taps to maintain stable output voltage, even under rapidly changing load conditions. Built for harsh outdoor environments, the SVR-3 features a fully sealed oil-immersed tank with excellent corrosion protection, advanced cooling system, and comprehensive protection functions including over-voltage, under-voltage, overload, short-circuit, and reverse power protection. With remote monitoring capability and high overload capacity, the SVR-3 significantly improves power quality, reduces energy losses, and enhances reliability across distribution networks.
225kVA Three Phase Pad Mounted Transformer
The 225kVA three-phase pad transformer is an efficient and reliable power conversion device designed for commercial, industrial and distribution systems. With a high power capacity of 225kVA, the transformer is able to provide a stable three-phase power supply for large-scale equipment to meet high load requirements. Its rugged housing is made of weather-resistant materials and meets NEMA 3R standards, ensuring long-term stable operation in outdoor environments and preventing the influence of external factors such as water, dust and corrosion.
315kVA Single Phase Pad Mounted Transformer
315kVA Single Phase Pad Mounted Transformer, engineered for seamless integration into underground power distribution systems, particularly in residential and commercial loop-feed setups. This compact, oil-filled transformer utilizes advanced high-permeability steel cores and precision-engineered windings to offer exceptional energy efficiency, low operating temperatures, and reduced sound levels for discreet urban installations. Compliant with ANSI C57.12.38 and IEEE standards, this single-phase padmount transformer ensures reliable voltage conversion from primary voltages up to 34.5kV to standard secondary outputs like 120/240V, supporting radial or loop configurations with high short-term overload capability for growing communities.
5000kVA Dry Type Transformer
The NPC ELECTRIC 5000kVA Dry Type Transformer is a high-capacity, reliable power solution designed for large-scale industrial and commercial operations. With a robust 5000kVA rating, it features advanced dry-type insulation technology for enhanced safety, low maintenance, and long-lasting performance. Engineered for demanding environments, this transformer ensures stable, efficient, and quiet operation while minimizing environmental impact. It achieves efficiencies around 99.48% at 35% load per DOE 2029 levels for three-phase low-voltage dry-type at 5000 kVA (aligned/interpolated from published tables showing progressive gains and 20% loss reduction from prior baselines), accommodates high harmonics, overloads, and ensures long-term reliability with reduced environmental footprint and operational expenses.
33kV Oil Immersed Transformer
33kV Oil Immersed Transformer is a high-voltage, three-phase power distribution and step-down unit engineered for reliable operation in 50/60Hz AC transmission and distribution networks with primary voltages up to 33kV (or 30-38.5kV range). It features a hermetically sealed or conservator-type tank with corrugated radiators or detachable coolers for superior thermal management and oil expansion compensation, providing excellent moisture barrier, oxidation resistance, and service life exceeding 35 years. Utilizing premium cold-rolled grain-oriented silicon steel cores with optimized step-lap joints and low-loss designs (S11/S13 series equivalents), it achieves substantial reductions in no-load losses (often 20-40% below older models), paired with high-conductivity copper windings.
110kV 115kV Power Transformer
NPC ELECTRIC's 110kV and 115kV power transformers are designed with advanced low-loss silicon steel sheets and efficient cooling systems, complying with international standards such as IEC 60076 and GB 1094, ensuring stable and reliable operation in high-voltage transmission systems. They are widely used in large power plants, substations, and industrial parks, providing safe and efficient power conversion and transmission solutions for power grids. It primary voltages (110kV or 115kV grounded wye/delta, dual-voltage options), secondary voltages (10.5kV, 11kV, 13.8kV, 33kV/34.5kV, or bespoke e.g., 115kV/13.8kV), copper/aluminum windings, ONAN/ONAF/ODAF cooling, BIL 350–550kV (up to 650kV optional), impedance 8–12% (±7.5% tolerance), ±8×1.25% or ±2×2.5% off-load taps (OLTC available), conservator/sealed tank.FAQ From Customers
-
What is a Transformer?A transformer is an electrical device used to change the voltage of alternating current (AC). It works on the principle of electromagnetic induction, converting high-voltage current into low-voltage current or low-voltage current into high-voltage current. Transformers are widely used in power transmission, distribution systems, and various electronic devices.
-
What are the main uses of a transformer?The main use of a transformer is voltage conversion. Transformers are used in power transmission systems to help transfer electricity from power plants to consumers. In addition, transformers are also used in electronic devices such as chargers, televisions, power adapters, etc., to adjust the voltage to meet the requirements of different devices.
-
Do you have UL listed?Yes, our transformer has UL listed. We have exported to America many pad mounted transformer,substation transformer and HV.
Welcome your inquiry
Honesty, Integrity, Frugality, Activeness and Passion