circuit-breaker unit(B)
This ASNA circuit breaker unit (Symbol: B) adopts natural air insulation. It is composed of an atmospheric-pressure sealed tank fitted with a circuit breaker and a three-position disconnector (closed / open / earthed), as well as a cable compartment. It is capable of switching load currents of distribution circuits and interrupting short-circuit fault currents, and features isolation and maintenance earthing functions.
The sealed tank operates under equal internal and external atmospheric pressure. No gas pressure monitoring is required, there is no risk of gas leakage, and zero maintenance is needed.
HM Power, a trusted ASNA switchgear manufacturer,
offers available configurations including single-bay single tank, 2-bay common tank and 3-bay common tank.circuit-breaker unit(B)
The ASNA circuit breaker unit（symbol B）is insulated by nature-air and consists of a atmospheric pressure sealed tank with a circuit breaker, a disconnector (close / open / earth),and a cable room. It can achieve the switching of load current on distribution lines, the breaking of short-circuit faults, and has the functions of isolation and maintenance grounding.
The atmospheric pressure sealed tank, with equal pressure of inside and outside, no need to monitor pressure, no risk of gas leakage, and no maintenance required. There is a solution of one bay, two bays common tank, and three bays common tank.
Introduction
Core functions
Protecr Function
Incoming/outgoing feeder circuit: A relay protection device integrated with three-stage overcurrent protection, zero-sequence protection and
Transformer outgoing feeder circuit: Self-powered relay protection devices are recommended. Powered by current transformers (CTs), they require no external operating power and satisfy short-circuit and overload protection requirements for distribution transformers.
The type of relay protection device can be selected in accordance with actual project conditions.
Operating Function
The circuit breaker is fitted with an electric operating mechanism capable of both manual and motorised energy storage. It can be equipped with one closing coil as well as one or two tripping coils.
Tripping coils are available in three types: conventional tripping coils, low-consumption coils (for use with self-powered relay protection devices), and coils with undervoltage trip function. The standard operating voltage is DC 48 V; custom options including AC 230 V, DC 110 V and DC 24 V are available.
The three-position switch is equipped with a manual operating mechanism, while a motorised three-position operating mechanism is supplied as an optional component.
The circuit breaker switchgear can be fitted with sensors for temperature, humidity, smoke detection, water immersion and video surveillance. Data from these sensors is uploaded to the SCADA system to enable real-time monitoring of the switchgear operating conditions. This allows potential risks to be eliminated at the early stage and guarantees reliable power supply of the circuit.
Multiple ASNA circuit breaker switchgears can be configured into a ring main power supply architecture. Leveraging the circuit breaker’s capability of fast fault interruption, the units can be interconnected to build a self-healing distribution network. Upon fault occurrence, faulty sections are automatically isolated, while power supply to fault-free sections is rapidly restored. This drastically cuts power outage duration and improves the overall power supply reliability of the distribution grid.
Parameter List
Structure Of The Circuit Breaker Switchgear
Closing Knob
Opening Knob
Circuit - Breaker Operating Mechanism
Vacuum Circuit - Breaker
Interlock Push Pedal
Disconnector Operation Hole
Earthing Operation Hole
3 - position Disconnector / Earthing Operating Mechanism
3 - position Disconnector / Earthing Switch
Observation Window
Cable Room
Pressure Balance Device
Voltage Presence Indicating System
Application
In China's industrial policy framework, the designation of "National Little Giant" enterprise carries a specific and demanding meaning. The ...
Italy has witnessed rapid growth in installed capacity of wind and solar new energy, with steadily rising demand for energy storage on both grid-side and commercial & industrial sides. By charging and discharging to implement peak shaving and valley filling, energy storage systems effectively smooth grid fluctuations and reduce power consumption costs. As a critical component for grid connection, the medium-voltage switchgear supporting energy storage power stations is subject to growing attention on environmental compliance. Relevant EU greenhouse gas control regulations impose mandatory constraints on equipment selection. The EU F-Gas Regulation (EU) 2024/573 clearly stipulates that SF₆ greenhouse gas shall be prohibited for new medium-voltage switchgear with rated voltage ≤24kV starting from 1 January 2026.
The Tanzania Sapphire Float Glass Industrial Park is a benchmark project under China’s Belt and Road Initiative. The glass manufacturing process imposes extremely stringent requirements on power supply continuity, power quality and voltage stability. Meanwhile, the park features complex operating conditions including high temperature, high humidity, dust and tin fog corrosion, which pose severe challenges to the corrosion resistance and long-term operational reliability of power distribution equipment.
Stockholm, Sweden, is a benchmark for smart city and green low-carbon urban development in Northern Europe. It was awarded the world’s first "European Green Capital" title in 2010. As a key supporting initiative for the grid intelligence and urban low-carbon transition of Stockholm, this smart city power distribution project comprehensively improves the stability and environmental performance of urban public power supply and serves as an important pillar for long-term sustainable development.
In 2014, the first batch of Tesla Superchargers in Västerås, Sweden, supporting this project was completed and put into operation. It serves as a highly representative energy replenishment infrastructure for new energy vehicles in Northern Europe. As a high-power dynamic electrical load scenario, the supercharger station imposes stringent requirements on the 10kV distribution system in terms of power supply reliability, equipment stability, fault handling capability and low-carbon compliance.
The commercial Wenchang Space Launch Site is located on the coast of Hainan, featuring year-round high humidity and salt spray. Its core power distribution room supports uninterrupted critical services including launch telemetry & control, command communication and data computation. It imposes aerospace-grade stringent requirements far exceeding ordinary industrial standards on the safety level of the power distribution system, power supply continuity, environmental weather resistance and long-period maintenance-free performance.
As the core aviation hub of the Hainan Free Trade Port, Haikou Meilan International Airport undertakes key functions including passenger and cargo transportation as well as air traffic control (ATC) navigation support. The ATC station room renovation required an upgrade of the power distribution system under non-stop flight and uninterrupted ATC service conditions. The project demands absolutely continuous and secure power supply, while the equipment must adapt to on-site conditions featuring densely arranged devices and complex electromagnetic environments.
Tencent Data Center in Guizhou is China’s first large-scale cave-type data center, undertaking core services including data storage and AI training. Power outages may result in data loss and computing capacity loss, so extremely high reliability requirements are imposed on power supply. Its unique geographic location also raises stringent requirements for anti-condensation performance and maintenance-free operation.
Qualification
Certification And Qualification
Questions and answered
A: Yes. All switchgears are equipped with standard pressure relief channels，The IAC grade is AFLR 20kA/1s, 25kA/1s, and 31.5kA/0.5s.
A: When the secondary top box is not included, the minimum height of the 24kV switchgear is 1700mm. This height has a significant impact on the installation of CT and busbar PT. It is recommended that the to select 1A for the secondary current. For specific precision and capacity parameters, please communicate with us. If busbar PT is selected, please communicate the installation method with us.
A: The opening coil can be selected from conventional electric opening coils, low-power coil (for self-powered relay protection), and under-voltage trip coil. The closing coil can be selected as a conventional electric closing coil.
The manual energy storage operating mechanism can be equipped with two opening coils but no closing coils. The electric energy storage operating mechanism can be equipped with 2 opening coils and 1 closing coil.
A: The air filtration device is composed of a casing, filter materials, etc. When there is a pressure difference between the air inside and outside the sealed box, the air can exchange and breathe through this device. At the same time, it can effectively prevent solid particles such as dust and salt spray from entering the sealed box.
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