Frequently Asked Questions

1.Who are we?
Our headquarters is located in the Zhejiang Province Quzhou City, China's power transmission and distribution industry base, established in 2007, selling to the domestic market (80.00%), export to overseas (20.00%). Our office has a total of about 101-200 people.

2.How do we ensure quality?
Batch production is always the sample before production.
Always conduct a final inspection before shipment.

3.What can you buy from us?
10kV-220kV oil-immersed power transformers, dry-type transformers, distribution transformers, rectifying transformers, electric furnace transformers, special-purpose transformers, high-voltage distribution cabinets, distribution boxes, power cabinets, box-type substations, pre-assembled box substations, and so on.

4.Why would you choose to purchase from us rather than from another supplier?
As a professional manufacturer of transformers and high-low pressure switchgears with a history of 20 years, we are proud to hold ISO9001-2008, OHSAS 18001:2008, ISO4001:2009L certificates. We adhere to IEC, ANSI, KEMA, GOST standards and offer high-quality products with fast delivery, a global after-sales service team, and competitive pricing.

5.What services can we provide?
Acceptance of delivery terms: FOB, CIF, EXW;
Accepted payment currency: US dollar, RMB.
Acceptance of payment: Telegraphic transfer, Letter of Credit.

Spoken English and Mandarin Chinese.

Alright, here is a professional and comprehensive introduction to the 380V distribution box products, which you can directly use in product catalogs, websites, or to introduce to customers.

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1. Product Overview

380V Distribution Cabinet, also known as a Low-Voltage Power Distribution Cabinet, is a core device in the power supply systems of industries, businesses, and large-scale residential buildings. It is primarily responsible for receiving and distributing 380V three-phase AC electricity from transformers, providing safe, reliable, and efficient electricity distribution and control protection for motors, production lines, lighting systems, and other high-power electrical equipment.

As the "nerve center" of the power system, it distributes the main power source reasonably to various power circuits, and ensures that when overloading or short circuits occur, it can quickly cut off the power supply to protect the safety of people and equipment.

II. Core Features and Advantages

1. High-reliability power supply
· High-quality core components: Utilizing well-known brands of circuit breakers, contactors, relays, etc., to ensure that opening and closing operations are sensitive and protection is precise.
· Stable voltage level: Designed specifically for 380V three-phase four-wire or three-phase five-wire systems, meeting the needs of the majority of power equipment.
· Robust Structure: The box has high mechanical strength, able to withstand the impact of internal arc faults, enhancing the overall system stability.
2. Comprehensive Security Guarantees
· Multiple protection mechanisms: Integrated short-circuit protection, overload protection, under-voltage protection, and more. Some advanced models also offer optional leakage protection and phase-loss protection.
· Comprehensive isolation and locking: Equipped with isolation switches to ensure complete circuit disconnection during maintenance, and can be equipped with mechanical interlocking devices to prevent inadvertent operations.
· Excellent protection and insulation: The shell protection level is usually IP54 or higher (dustproof, waterproof), and the internal materials have high insulation levels, effectively preventing electric shock.
3. Flexible Configuration and Scalability
· Modular Design: Utilizing standard rails (e.g., DIN rails) and modular electrical components, the system can be flexibly combined to meet the user's requirements for the number, capacity, and functionality of the circuits.
· Easy to expand: The box design leaves ample spare circuit space, making it convenient to expand the lines for future equipment increases.
Customized solutions: We can provide non-standard customized solutions based on the site conditions (such as the environment and load type), such as explosion-proof boxes and outdoor boxes.
4. The trend of intelligent management (for high-end models)
· Integrated Intelligent Metering: Equipped with power parameter monitoring meters, real-time monitoring of voltage, current, power, and electrical energy data.
Remote communication capability: Supports RS485, Ethernet, and other communication interfaces, and can be accessed through Modbus, Profibus, and other protocols to integrate into building automation or energy management systems, enabling remote monitoring, alarm, and energy consumption analysis.
5. Convenient Installation and Maintenance
· Clear identification system: internal wiring diagrams and loop identification are clear and specific, which is convenient for installation, debugging, and future maintenance.
Humanized structure: The front and rear doors can be easily opened, the internal space is spacious, which is convenient for wiring and component replacement.

Section Three: Major Components

A standard 380V distribution box typically includes the following components:

· Enclosure: Cold-rolled steel plate or stainless steel material, surface sprayed with plastic or zinc-coated, resistant to corrosion.
· Bus system: Includes horizontal main bus and vertical branch bus, responsible for the gathering and distribution of electrical energy, usually made of copper or aluminum busbars.
· Feeder Unit: Main Switch, usually using a frame circuit breaker or a plastic shell circuit breaker.
· Outlet Unit: Multiple branch circuit switch, generally using plastic shell circuit breakers or mini-circuit breakers.
Control and protection components: such as contactors (for starting and stopping control of motors), thermal relay (overload protection), inverters, soft starters, etc.
· Auxiliary components: Indicator lights, buttons, voltage/current meters, transformers, etc.

Section 4: Major Application Fields

380V distribution box is widely used in all situations where three-phase power is required:

· Industrial manufacturing: factory workshops, production lines, machine tools, injection molding machines, air compressors, etc.
Commercial buildings: large shopping malls, office buildings, hotels (central air conditioning, pumps, elevators).
· Infrastructure construction: wastewater treatment plants, pump stations, subway stations, airports.
· New Energy Field: Photovoltaic Power Stations, Charging Pillar Arrays.
· Specialized environments: mines, ships, port machinery.

V. Product Classification

· By installation method: divided into surface-mounted wall-mounted, embedded installation, and free-standing.
· According to functional use: divided into power distribution boxes, lighting distribution boxes, control boxes (such as fan and pump control boxes), power switching boxes (ATS) and so on.
· According to the structural form: divided into fixed-type and drawer-type (MCC-Motor Control Center). The drawer-type is convenient for quick maintenance and replacement, often used in large factories.
· By material: divided into steel, stainless steel (suitable for humid and corrosive environments), and engineering plastics.

Section Six: Guide to Selection

When selecting a 380V distribution box, please ensure to consider the following critical parameters:

1. Total Feeder Capacity: Determined based on transformer capacity and total calculated load, such as 400A, 630A, 800A, etc.
2. Outlet circuit number: The number of devices that need power supply.
3. Outlet Capacity: The rated current of each circuit breaker is calculated based on the load power.
4. Load Type: Is it an electrical motor load (considering start-up current), a resistive load, or a mixed load?
5. Protection Level: Choose based on the installation environment (indoor/outdoor, dusty and humid conditions), such as IP54, IP65.
6. Enclosure dimensions: Determined based on the number of components, wiring space, and installation location.
7. Special Function Requirements: Do you need intelligent monitoring, remote control, dual power supply switching, etc.



380V distribution boxes are an indispensable key equipment in modern electrical systems. They are not only simple units for electricity distribution but also integrated safety protection systems that combine protection, control, and monitoring. Choosing a well-designed and reliable distribution box is the foundation for ensuring the long-term, stable, and efficient operation of the entire electrical system.

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Statement: The design, installation, commissioning, and maintenance of the distribution box must be carried out by qualified professional electricians in accordance with local electrical standards and national standards (such as GB standards), to ensure absolute safety.