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11KV Medium Voltage Circuit Breaker Isolator Mechanism
Cotenele is one of the core partners of State Grid Corporation of China,our products such as medium-voltage ring main units and environmentally friendly switchgears is widely popular in their medium voltage power distribution projects.The KDVM-12/630-20-S series 11KV Medium Voltage Circuit Breaker Isolator Mechanism manufactured by Cotenele is a matching equipment suitable for the closing and opening operations of circuit breakers in rechargeable medium-voltage ring main units.This product complies with the requirements of relevant standards and specifications such as GB1984-2014 "High Voltage AC Circuit Breakers" and GB/T1985-2023 "High Voltage AC Disconnectors and Grounding Switches".
Ring Main Units (RMUs) are widely used for power supply reliably in medium voltage power distribution networks such as urban power grids, industrial parks, and commercial complexes . Contenele Company has long been committed to the research and development of core components for this sort of medium voltage ring main units and environmentally friendly switchgear.
The 11KV Medium Voltage Circuit Breaker Isolator Mechanism is core components of RMU and eco-friendly switchgear or gas-insulated switchgear, The operating mechanisms we manufactured have received high praise from our customers for many years.these operating mechanisms are divided into two types: manual and electric based on control models, this ensures a flexible, safe and efficient power distribution.
Model and meaning
| KD | VM | 40.5 | 630 | 20 | S |
|
Company code |
Vacuum circuit breaker operating mechanism |
Rated voltage |
Rated current |
Rated Short-time withstand current | Upper isolator |
Definition of Operating Mechanism
The 11KV Medium Voltage Circuit Breaker Isolator Mechanism is the power execution unit of medium-voltage switchgear. It is a mechanical component that provides the energy required for the opening and closing of the main contacts of switching devices such as load switches, circuit breakers, and disconnectors.
It has four core parts including energy storage components (typically springs), transmission linkages, latching systems, and auxiliary contacts.
The operating mechanism converts manual force or electrical energy into controlled mechanical motion, this can ensure precise and rapid operation of medium-voltage switches. The operating mechanisms often feature spring mechanisms energy storage that can be charged either manually with operating handles or electrically through motors, which will allow for both local and remote control.
Application Scope
The 11KV Medium Voltage Circuit Breaker Isolator Mechanism is widely used in various types of medium voltage switchgears and RMUs:
Ring Main Units
The operating mechanism is core component of the RMU often used to control the operation for the vacuum circuit breaker or disconnector, The circuit breaker operating mechanism and isolating switch operating mecnanism usually are combinated to use in a compact RMU.
Gas-Insulated Switchgear
Commonly known as gas-filled panels, these use SF6 gas for insulation and arc extinction, requiring sealed operating mechanisms .
Eco-Friendly Switchgear
New-generation eco-friendly panels using solid insulation or environmentally friendly gases instead of SF6, such as the solid-insulated switchgear and eco-friendly switchgear with specialized operating mechanisms .
Fixed-Type Metal-Enclosed Switchgear
Such as HXGN series switchgear widely used in rural and urban power distribution system and power grid upgrade .
These operating mechanisms are suitable in various environments reliably, from -40°C to +40°C, with Protection grade up to IP3X ensuring protection against dust and water ingress
Classification of Operating Mechanisms
The operating mechanism in the ring main unit is usually classified according to the functional units it serves. Each unit type has its specific characteristics and application areas.
C-Unit (Load Switch Unit)
The C-unit is equipped with a load break switch mechanism, typically using a single spring energy storage mechanism for closing and opening operations under normal load current. It serves as the incoming unit, controlling the main power supply enter the power distribution . The C-type mechanism features independent operating axis for the load switch and can be equipped with motor operation for remote control .
V-Unit (Circuit Breaker Unit)
The V-unit contains a vacuum circuit breaker mechanism, utilizing tension spring energy storage for closing and compression spring energy storage for opening operations . This mechanism offers high breaking capacity for short-circuit currents and includes anti-pumping functionality to prevents witch sticking faults . V-units are used for both incoming and outgoing applications where enhanced protection and frequent operation are required .
G-Unit (Disconnector/Earthing Switch Mechanism)
The G-unit refers to the disconnector and earthing switch mechanism, employing compression spring over-center release principle . It provides visible isolation gaps for maintenance safety and is typically interlocked with the main switch. The mechanism features separate operating axis positions for disconnector (right side) and earthing switch (left side), with clear mechanical indication .
F-Unit (Load Break Switch-Fuse Combination Unit)
The F-unit combines a load break switch mechanism with fuse protection, typically using a dual-spring mechanism (A-type) where one spring is for closing and another for opening . When a fuse blows, its striker triggers the mechanism to open all three phases simultaneously, preventing single-phasing . This unit is the standard outgoing feeder for transformer protection .
Incoming Mechanism
The incoming mechanism is the operating device at the power entrance of the distribution system, typically implemented as C-unit (load switch) or V-unit (circuit breaker) depending on requirements . It controls the total power supply to the entire switchgear assembly and must reliably handle the full load current .
Outgoing Mechanism
The outgoing mechanism controls and protects individual distribution circuits, typically implemented as F-unit (load switch-fuse combination) for transformer feeders or V-unit for higher capacity requirements . It must selectively trip on downstream faults while maintaining supply to healthy circuits.
Production Workshop
Appearance and Dimensions
Real Project Experience
Cotenele products have been applied in multiple large-scale power and energy projects, including:
110kV substations and 35kV gas-insulated switchgear systems
Offshore wind power projects (China Resources Power)
1600MW photovoltaic base projects in Qinghai
Railway infrastructure projects (China Railway / PowerChina)
Overseas mining power systems (Tajikistan gold mine project)
FAQ
1. What is the 11kV Medium Voltage Circuit Breaker Isolator Mechanism?
It is the core operating unit in medium-voltage switchgear, responsible for opening and closing circuit breakers, load break switches, and disconnectors. It converts manual or electrical energy into precise mechanical motion, ensuring safe and reliable operation under normal and fault conditions.
2. What standards does this mechanism comply with?
GB1984-2014: High Voltage AC Circuit Breakers
GB/T1985-2023: High Voltage AC Disconnectors and Grounding Switches
Manufactured under ISO9001, ISO14001, and ISO45001 certified systems.
3. What support does Cotenele provide for buyers?
Technical datasheets and drawings
Installation guidance
OEM customization and branding
Fast delivery for bulk orders
Suitable for EPC contractors, switchgear manufacturers, and global distributors.
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Building 2, Changhong Industrial Park, No. 501 Liule Road, Liushi Town, Yueqing City, Wenzhou City, Zhejiang Province, China
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