Low Voltage Withdrawable Switch Cabinet
The Low Voltage Withdrawable Switch Cabinet is a state-of-the-art power distribution solution designed for safe, flexible, and efficient low-voltage electrical systems. Featuring modular withdrawable drawers (functional units), it allows quick extraction and insertion of circuit breakers, contactors, and other components without interrupting power to the entire system. This design significantly reduces downtime during maintenance, enhances operational safety, and supports high-reliability applications in modern industrial and commercial facilities. Built with robust compartmentalized construction, high-quality busbar systems, and advanced safety interlocks, the cabinet ensures excellent short-circuit withstand capability, thermal performance, and protection against arc faults. It integrates seamlessly with intelligent monitoring systems for real-time data on current, voltage, power quality, and predictive maintenance. Ideal for motor control centers (MCC) and power control centers (PC), this withdrawable switchgear optimizes space utilization while delivering superior flexibility for future expansions or modifications.
- Primary Voltage Ratings 380V / 400V / 415V / 690V
- Type Switchgear
- Standards IEC 61439 / IEC 60947 / ANSI
- Application industrial automation systems, utility substations
- Certificate UL, CESI, IEEE
- Cooling Method ONAN / ONAF
Technical Specifications
Customization Optional
Packing and Shipping
Manufacturer Test
Routine Testing
Application
Technical Specifications
Low Voltage Withdrawable Switch Cabinet
Low Voltage Withdrawable Switch Cabinet Data Sheet
| Parameter | Specification | Details |
| Rated Insulation Voltage | 690V / 1000V | - |
| Rated Operational Voltage | 380V / 400V / 690V | AC 50/60Hz |
| Rated Current (Main Bus) | 400A - 6300A | Customizable |
| Rated Short-Time Withstand Current | 50kA - 100kA / 1s | Peak up to 220kA |
| Degree of Protection | IP30 / IP40 / IP54 | As per requirement |
| Internal Separation | Form 3b / Form 4a / Form 4b | Compartmentalized |
| Drawer Types | 1/4, 1/2, 1, 2, 3 modules | Up to 36+ units per cabinet |
| Functional Unit Capacity | Incoming, Feeder, Motor Control | ACB, MCCB, Contactor based |
| Busbar Material | Copper / Tin-plated Copper | Silver-plated optional |
| Operating Temperature | -5°C to +40°C | Humidity ≤95% |
| Standards Compliance | IEC 61439, GB/T 7251, UL 1558 | Certified |
Customization Optional
Low Voltage Withdrawable Switch Cabinet
The Low Voltage Withdrawable Switch Cabinet can be extensively customized according to project load requirements, motor control applications, operational environments, and industrial automation architectures. Customers may select different drawer module sizes, breaker capacities, busbar configurations, and feeder unit arrangements depending on electrical load distribution and operational flexibility requirements. The cabinet can additionally integrate motor control centers, variable frequency drive systems, soft starters, capacitor compensation units, harmonic suppression devices, intelligent metering systems, and digital protection relays for advanced electrical management applications. Optional drawer locking mechanisms, intelligent fault diagnosis systems, and remote operation modules further improve maintenance safety and operational efficiency for critical industrial applications.
The enclosure and internal structural configuration can also be optimized for utility substations, industrial production lines, mining operations, petrochemical plants, renewable energy facilities, transportation infrastructure, and high-humidity electrical environments. Optional features include arc flash protection systems, anti-condensation heaters, thermal monitoring devices, intelligent ventilation systems, fire-resistant compartment structures, and remote communication interfaces for smart-grid integration. Customers may further customize cabinet dimensions, cable routing methods, enclosure coatings, branding labels, busbar layouts, and intelligent monitoring interfaces to simplify installation and improve automation integration capabilities. These advanced customization solutions ensure the withdrawable switch cabinet can fully adapt to modern industrial automation systems and low-voltage power distribution networks.
Packing and Shipping
Low Voltage Withdrawable Switch Cabinet
The Low Voltage Withdrawable Switch 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, coating quality assessment, and electrical component protection procedures to minimize transportation risks and environmental exposure. Sensitive devices including intelligent protection relays, communication modules, metering systems, PLC interfaces, and monitoring equipment are additionally protected using moisture-proof and vibration-resistant industrial packaging materials.
Each switch cabinet is internally reinforced using transportation locking systems and heavy-duty support structures to prevent component movement during road, railway, or sea transportation. Withdrawable drawer units are securely locked and mechanically protected to avoid vibration damage and maintain operational precision during shipment operations. Busbar assemblies, circuit breakers, cable compartments, auxiliary control devices, and intelligent monitoring systems are additionally reinforced to preserve assembly integrity and reduce transportation impact risks. External cabinet surfaces are protected using industrial waterproof wrapping film, reinforced corner guards, anti-scratch covers, and impact-resistant fastening systems to maintain enclosure quality throughout long-distance transportation and warehouse storage.
Depending on project dimensions, transportation conditions, and customer logistics requirements, the low voltage withdrawable switch cabinet may be shipped using skid-mounted transportation systems, steel-frame export packaging, fumigation-free wooden crates, or direct container securing structures compliant with international logistics standards. Additional anti-condensation protection systems, anti-vibration reinforcement measures, and marine-grade corrosion protection solutions are available for offshore projects, coastal installations, mining operations, and remote industrial facilities requiring extended transportation durations and complex logistics coordination.
Shipping documentation generally includes factory inspection certificates, operation manuals, electrical schematics, wiring diagrams, packing lists, quality inspection reports, and export compliance certifications. Customers may additionally request multilingual labels, customized shipping marks, installation guidance manuals, and project-specific logistics coordination support. The complete packing and shipping procedure 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 switch cabinet is internally reinforced using transportation locking systems and heavy-duty support structures to prevent component movement during road, railway, or sea transportation. Withdrawable drawer units are securely locked and mechanically protected to avoid vibration damage and maintain operational precision during shipment operations. Busbar assemblies, circuit breakers, cable compartments, auxiliary control devices, and intelligent monitoring systems are additionally reinforced to preserve assembly integrity and reduce transportation impact risks. External cabinet surfaces are protected using industrial waterproof wrapping film, reinforced corner guards, anti-scratch covers, and impact-resistant fastening systems to maintain enclosure quality throughout long-distance transportation and warehouse storage.
Depending on project dimensions, transportation conditions, and customer logistics requirements, the low voltage withdrawable switch cabinet may be shipped using skid-mounted transportation systems, steel-frame export packaging, fumigation-free wooden crates, or direct container securing structures compliant with international logistics standards. Additional anti-condensation protection systems, anti-vibration reinforcement measures, and marine-grade corrosion protection solutions are available for offshore projects, coastal installations, mining operations, and remote industrial facilities requiring extended transportation durations and complex logistics coordination.
Shipping documentation generally includes factory inspection certificates, operation manuals, electrical schematics, wiring diagrams, packing lists, quality inspection reports, and export compliance certifications. Customers may additionally request multilingual labels, customized shipping marks, installation guidance manuals, and project-specific logistics coordination support. The complete packing and shipping procedure 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 Withdrawable Switch Cabinet
Progress Test
The Low Voltage Withdrawable Switch Cabinet undergoes a comprehensive multi-stage production testing program designed to maintain strict quality control and electrical safety throughout the manufacturing process. The testing procedure begins with enclosure structural verification, dimensional tolerance analysis, busbar installation inspection, drawer mechanism alignment inspection, and coating thickness measurement to ensure mechanical durability and environmental protection performance under industrial operating conditions. As production advances, engineers inspect breaker installation accuracy, drawer movement stability, cable termination reliability, grounding system continuity, compartment segregation performance, and ventilation structure integrity. Particular attention is given to insulation spacing, electrical connection stability, and thermal dissipation pathways to ensure safe continuous-load operation. Auxiliary devices including anti-condensation heaters, intelligent communication modules, thermal monitoring sensors, cooling systems, and PLC interfaces are also verified during installation.
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)
♦ Applied Voltage
♦ Induced Voltage
♦ Lightning Impulse
♦ Insulation Resistance (Rated Voltage)
♦ Temperature Rise
♦ Dielectric Withstand (Hipot)
Factory Acceptance Test
The transformer Factory Acceptance Test program for transformer-integrated Low Voltage Withdrawable Switch Cabinet systems is designed to guarantee manufacturing quality consistency and dependable field operation in industrial and commercial power distribution applications. The testing procedure begins with visual inspections and dimensional verification of transformer tanks, bushings, grounding terminals, cooling systems, enclosure coating quality, and accessory installation to confirm conformity with approved engineering drawings. The transformer insulation system is evaluated using insulation resistance testing, polarization index analysis, dielectric withstand testing, and induced overvoltage testing to verify insulation stability under electrical stress conditions. Additional electrical performance tests include transformer ratio measurement, impedance voltage testing, polarity confirmation, load loss analysis, and winding resistance measurement to ensure efficient transformer performance and accurate voltage regulation.
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
Perfect for industrial manufacturing plants with motor control centers driving conveyors, pumps, and HVAC systems; commercial buildings requiring reliable power distribution panels; and data centers needing high-availability feeder cabinets. Combines effectively in food processing facilities and automotive assembly lines.
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
1250kVA Three Phase Pad Mounted Transformer
NPC ELECTRIC's 1250kVA Three Phase Pad Mounted Transformer is a high-performance, oil-immersed distribution transformer engineered for reliable underground power distribution in demanding environments. It delivers exceptional efficiency (up to 99.2% or higher), low no-load and load losses, and a 65°C average winding rise for extended service life exceeding 30-40 years. Key components include high-grade silicon steel core, aluminum or copper windings, 5-position tap changer (±2x2.5%), pressure relief valve, oil level gauge, and tamper-resistant enclosure in Munsell green finish.
33kV Cast Resin Dry Type Transformer 1000kVA–5000kVA Three Phase
The 33kV Cast Resin Dry Type Transformer 1000kVA–5000kVA Three Phase is a high-capacity, oil-free power solution engineered for demanding indoor medium- and high-voltage distribution networks. This robust three-phase cast resin transformer utilizes premium low-loss grain-oriented silicon steel cores and high-conductivity copper windings (aluminum optional) fully encapsulated in high-grade epoxy resin under vacuum pressure, delivering exceptional energy efficiency (typically 98.5–99.5%), significantly reduced no-load and load losses, and superior partial discharge performance (<10pC). Fully compliant with IEC 60076-11, IEEE/ANSI, and relevant energy efficiency standards, this transformer steps down 33kV primary (with ±2×2.5% to ±10% off-circuit taps standard) to secondary voltages such as 0.4kV, 0.69kV, 6.6kV, or 11kV (Dyn11 vector group typical).
10kVA Completely Self-protected(CSP) Single Phase Pole Mounted Transformer
NPC ELECTRIC the production of 10 kVA Completely Self-Protected (CSP) single-phase overhead transformers, meticulously engineered to meet international standards such as IEEE C57.12.00, IEEE C57.12.20, DOE-2016 Efficiency, CSA C2.1, and CSA C2.2. The 10kVA fully self-protected (CSP) single-phase pole-mounted transformer is an efficient and reliable power equipment designed for small and medium-sized power needs. The transformer adopts advanced fully self-protection technology and has built-in overload, short-circuit and overvoltage protection functions to ensure that the transformer can automatically cut off power under abnormal conditions, avoid equipment damage and improve system safety. It has a simple design, is easy to install, saves space, and is suitable for all types of power distribution systems. This transformer is suitable for residential, commercial areas and small industrial places, providing stable single-phase power output.
260 kV 20MVA 28 MVA Substation Power Transformer
The robust 260 kV 20/28 MVA substation power transformer, engineered for high-voltage applications in modern electrical grids. This oil-immersed unit features dual capacity ratings for flexible operation under varying loads, ensuring efficient power distribution and voltage step-down in utility substations. With advanced insulation systems and low-loss core materials, it minimizes energy dissipation while handling peak demands reliably. Ideal for integrating renewable energy sources or industrial power systems, this transformer complies with IEC 60076 standards, offering superior performance in harsh environments. Its compact design facilitates easy installation, making it a top choice for upgrading aging infrastructure or expanding grid capacity.
35kV Oil Immersed Transformer
NPC ELECTRIC's 35kV Oil Immersed Transformer is a premium three-phase power transformer optimized for high-voltage step-down in 50/60Hz AC systems with primary ratings of 35kV (or 33-38.5kV range). It incorporates a robust conservator or fully sealed tank design with efficient radiator cooling (ONAN standard, ONAF optional), ensuring exceptional thermal dissipation, moisture exclusion. Outdoor-rated with pollution-resistant bushings (BIL 170-200kV), Dyn11/Ynd1 vector groups, and low noise (<62dB), it provides stable 35kV to secondary voltages (e.g., 10kV/6.3kV/0.4kV) conversion, enhancing grid stability, minimizing transmission losses, and supporting demanding applications in harsh or high-altitude conditions.
11/0.4kV 630kVA Oil-Immersed Power Transformer Distribution Type
Discover our premium 11/0.4kV 630kVA Oil-Immersed Power Transformer, engineered for superior high-efficiency distribution in modern electrical grids. This robust transformer features advanced silicon steel cores that minimize energy losses, ensuring up to 98% efficiency under full load. Ideal for urban and rural power networks, it incorporates eco-friendly insulating oil with high dielectric strength, providing reliable voltage step-down from 11kV to 0.4kV while handling demanding loads up to 630kVA. Built with corrosion-resistant tanks and precision-wound copper coils, this distribution transformer guarantees long-term durability, reduced maintenance, and compliance with international standards like IEC 60076. Whether for residential complexes, commercial facilities, or industrial applications, it optimizes power delivery, lowers operational costs, and supports sustainable energy practices. Experience unmatched performance with this high-efficiency oil-immersed transformer designed for seamless integration into your power system.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