Why Cotenele?

Innovation and Technology
Advanced R&D and patented solutions.
Quality
Assurance
ISO9001, ISO14001, ISO45001 certified products.
Global
Reach
Supplying clients in China and international markets.
Eco-Friendly Solutions
Sustainable switchgear for a green future.
Professional Support
Expert engineering and after-sales services.

Certifications and Quality

Certified for Quality, Safety, and Environment

ISO9001 Quality Management
ISO14001 Environmental Management
ISO45001 Occupational Health & Safety
National testing reports for GIS, AIS, RMU, and vacuum breakers
Certifications and Quality
What We Do

What We Do

We focus on research, development, and manufacturing of 3.6kV-40.5kV switchgear and internal core components, including:

  1. 1

    LV and MV Switchgears

  2. 2

    Ring Main Units

  3. 3

    Power Transformers

  4. 4

    Prefabricated substations

  5. 5

    New Energy Storage

As a professional power equipment manufacturer in China, we serve industries such as power generation, railways, petrochemical, municipal infrastructure, renewable energy, and industrial plants, providing reliable solutions from design to delivery.

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About Us

Cotenele International Trade (Wenzhou) Co., Ltd.

Cotenele International Trade (Wenzhou) Co., Ltd. is a professional China-based manufacturer and exporter of power transmission equipment, dedicated to providing reliable medium and high voltage solutions for global industrial applications. The company has a self owned factory covering an area of over 30000 square meters, is committed to the prosperous development of China's power industry, serving integrated power supply modes of medium voltage, high voltage, and complete sets; Focusing on the research and production of core components for 12kV-40.5kV switchgears, including Gas-insulated Switchgears (GIS), Environmental-friendly Switchgears, and Air-insulated Switchgears. The company’s comprehensive product portfolio also covers Low-voltage and Medium-voltage Switchgears, Ring Main Units (RMUs), Prefabricated Substations, Power Transformers, Load Break Switches, Circuit Breakers, and Disconnectors. These products are suitable for industries such as power, railway, petrochemical, subway, municipal construction, steel, coal, etc.

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China Switchgear Factory
Ring Main Unit
Ring Main Unit
A Ring Main Unit is a type of medium-voltage switchgear used in power distribution networks. It is a compact, factory-assembled, metal-enclosed set of switchgear components (such as load-break switches, fuses, and busbars), typically applied at rated voltage levels from 10 kV to 40.5 kV.
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Ring Main Unit Components
Ring Main Unit Components
Ring Main Unit components are the essential functional units that make up a complete RMU system. Their performance directly determines the safety, reliability, and stability of a medium-voltage power distribution network.
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Switchgear
Switchgear

Switchgear is one of Cotenele’s core electrical distribution products. Our product range includes low voltage switchgear, medium voltage switchgear, and ring main units (RMU), widely used in power generation, transmission, and distribution systems.

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Featured Products

Explore Cotenele quality medium voltage switchgear, RMU and power distribution solutions with OEM support, factory direct supply and reliable global export service.

24KV SF6 Free Environmentally Friendly Switchgear

24KV SF6 Free Environmentally Friendly Switchgear

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12KV Environmentally Friendly Gas-insulated Switchgear

12KV Environmentally Friendly Gas-insulated Switchgear

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33KV Medium Voltage Gas Insulated System

33KV Medium Voltage Gas Insulated System

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11KV Medium Voltage Gas Insulated Switchgear

11KV Medium Voltage Gas Insulated Switchgear

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33KV Medium Voltage Metalclad Switchgear Panels

33KV Medium Voltage Metalclad Switchgear Panels

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33KV MV Switchgear Medium Voltage Switch Gear

33KV MV Switchgear Medium Voltage Switch Gear

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22KV Medium Voltage Metal Clad Switchgear

22KV Medium Voltage Metal Clad Switchgear

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11KV Indoor Metal Clad Medium Voltage Switchgear

11KV Indoor Metal Clad Medium Voltage Switchgear

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Cotenele International Trade (Wenzhou) Co., Ltd.

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News

Stay updated with Cotenele latest switchgear innovations, industry trends and power distribution project news from a trusted China manufacturer.

What Factors Should Engineers Consider When Selecting Medium Voltage Switchgear?

13

2026-07

What Factors Should Engineers Consider When Selecting Medium Voltage Switchgear?

Selecting medium voltage switchgear is not a transaction. It is a design decision that will shape a facility's electrical safety, operational flexibility, and maintenance budget for twenty to thirty years. Unlike components that can be swapped out during a routine shutdown, switchgear is structural. Once the busbars are installed, the panels are bolted together, and the cables are terminated, changing the equipment configuration becomes a major capital project.

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How Aging Power Infrastructure Is Driving the Need for Modern Medium Voltage Solutions

10

2026-07

How Aging Power Infrastructure Is Driving the Need for Modern Medium Voltage Solutions

COTENELE explores how aging power infrastructure, with equipment over 30 years old, is driving the need for modern medium voltage solutions. The article covers challenges like rising maintenance costs, SF6 regulations, and grid changes, and presents how vacuum circuit breakers and SF6-free RMUs provide reliable, cost-effective upgrades for utilities, data centers, and industrial plants.

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Power Transformers: Core Components for Voltage Conversion and Energy Transfer

13

2026-04

Power Transformers: Core Components for Voltage Conversion and Energy Transfer

Power transformers are fundamental equipment in AC power systems for voltage conversion, energy transfer, and electrical isolation. Through electromagnetic induction, a transformer converts electrical energy from one voltage level to another at the same frequency, meeting requirements for generation step-up, long-distance transmission, regional distribution, and end-user utilization.

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Medium-Voltage Switchgear: A Critical Hub in Power Distribution Networks

13

2026-04

Medium-Voltage Switchgear: A Critical Hub in Power Distribution Networks

Medium-voltage switchgear plays an indispensable role in modern power infrastructure. Serving as the control node between power generation, transmission, and end-user consumption, this equipment is responsible for closing and opening normal load currents while automatically interrupting fault currents under short-circuit conditions, thereby protecting connected transformers, lines, and generators.

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How to Select the Right RMU for Medium Voltage Distribution Applications

17

2026-07

How to Select the Right RMU for Medium Voltage Distribution Applications

COTENELE publishes a practical guide for engineers and procurement professionals on selecting the right Ring Main Unit (RMU) for medium voltage distribution applications. The article covers RMU module functions (ring feeder, transformer protection, bus coupler, direct metering), SF6-free dry air insulation technology, rating verification against site conditions, and maintenance philosophy. The guide helps ensure reliable, cost-effective RMU selection for utilities, wind farms, data centers, and commercial buildings across international markets.

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How to Evaluate the Quality of Medium Voltage Switchgear Before Purchase?

15

2026-07

How to Evaluate the Quality of Medium Voltage Switchgear Before Purchase?

COTENELE publishes a comprehensive guide for engineers, procurement professionals, and asset managers on evaluating medium voltage switchgear quality before purchase. The 7-step framework covers factory visits, IEC 62271 type-test verification, vacuum interrupter and insulation component quality, operating mechanism and mechanical interlock assessment, low-voltage compartment wiring inspection, documentation completeness, and after-sales support. The guide helps ensure reliable equipment selection for utilities, data centers, industrial plants, and renewable energy projects across international markets.

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How Medium Voltage Switchgear Works in Power Distribution Systems

09

2026-07

How Medium Voltage Switchgear Works in Power Distribution Systems

Medium voltage switchgear is a critical component in power distribution systems, serving as the control point between high voltage transmission networks and low voltage user equipment. This article covers how MV switchgear works, its four core functions—switching, fault protection, isolation, and measurement—and the different configurations used in substations, factories, data centers, and commercial buildings. It also explains vacuum circuit breakers, protection relays, and the industry trend toward SF₆-free switchgear. Cotenele provides a range of MV switchgear solutions, including KYN28 withdrawable switchgear, ring main units, and 24 kV SF₆-free RMUs.

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