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Hairui LW8-40.5 Outdoor HV SF6 Circuit Breaker Factory

The LW8-40.5 outdoor high-voltage SF6 circuit breaker is designed for the control and protection of 35kV power transmission and distribution systems, with a rated voltage of up to 40.5kV. Available electrical ratings, operating voltages, current-transformer configurations, insulation levels, and accessories can be selected according to the project’s single-line diagram and technical specifications.

Why Choose Hairui Electric?

  1. Application-Oriented Product Selection
    We review your system voltage, rated current, prospective short-circuit current, operating sequence, environmental conditions, and protection requirements before recommending a suitable configuration.
  2. Support for Customized Requirements
    Project-specific options can include control and motor voltages, CT ratios and accuracy classes, creepage distance, terminal orientation, support frames, auxiliary contacts, and accessories.
  3. Quality Inspection Before Delivery
    Critical electrical, mechanical, operating, sealing, and appearance requirements are checked before shipment according to the confirmed technical specification and inspection plan.
  4. Engineering Documentation Support
    Technical datasheets, outline drawings, wiring diagrams, nameplate information, packing details, and other project documents can be provided to support design review and approval.
  5. Export and EPC Project Experience
    We support international utility, industrial, renewable-energy, and EPC projects requiring IEC-oriented technical documentation, export packaging, coordinated delivery, and responsive technical communication.
  6. After-Sales Technical Assistance
    Our team provides support for product selection, installation preparation, commissioning, operation, maintenance, spare parts, and technical troubleshooting.
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LW8-40.5 Outdoor SF6 Circuit Breaker 0.5MPa Rated Gas Pressure

LW8-40.5 outdoor SF6 circuit breaker with 0.5MPa rated gas pressure, 0.47MPa alarm pressure and 0.15MPa
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LW8-40.5 Outdoor SF6 Circuit Breaker 3000-Operation Mechanical Life

LW8-40.5 outdoor SF6 circuit breaker with 3000-operation mechanical lifespan, 40.5kV, 1600/2000A, spring mechanism, long-term low-maintenance
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LW8-40.5 Lightning Impulse Withstand Outdoor SF6 Circuit Breaker

LW8-40.5 outdoor SF6 circuit breaker with lightning impulse withstand capability for overhead-line connected 40.5kV substations,
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LW8-40.5 2000A Outdoor SF6 Circuit Breaker 95kV Power Frequency Insulation

LW8-40.5 outdoor SF6 circuit breaker with 95kV power frequency withstand voltage, 1600/2000A rated current, spring
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High Voltage 40 5kv Outdoor Medium Mounted Sf6 Gas Insulated Circuit Breaker

High Voltage 40.5kV Outdoor Medium Mounted SF6 Gas Insulated Circuit Breaker

LW8-40.5 outdoor medium mounted SF6 gas insulated circuit breaker, 40.5kV rated voltage, 1600/2000A rated current,
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Hairui Electric

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For decades, Hairui has been dedicated to helping numerous well-known enterprises and institutions customize reliable equipment. With strong production capabilities and professional expertise, we ensure that our equipment is fully compliant and meets your requirements.

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Our Advantage

  1. Reliable Short-Circuit Interruption: The optimized SF6 arc-extinguishing system provides stable breaking performance for load switching and fault-current interruption. It helps isolate electrical faults quickly and protects transformers, transmission lines, busbars, and other high-voltage equipment.
  2. High Dielectric Strength: SF6 gas offers excellent insulating properties, allowing the circuit breaker to maintain dependable insulation performance within a compact high-voltage structure.
  3. Durable Outdoor Construction: The equipment is designed for outdoor substation environments and can be configured for project-specific temperature, altitude, humidity, wind, pollution, and seismic requirements.
  4. Stable Spring Operating Mechanism: The spring operating mechanism provides consistent opening and closing performance. Motor-charged and manually charged configurations support both remote electrical control and local operation.
  5. Reduced Routine Maintenance: A sealed gas system, reliable mechanical components, and convenient density-monitoring arrangements help reduce routine inspection and maintenance requirements during normal service.
  6. Flexible Project Configuration: Rated current, short-circuit breaking capacity, control voltage, auxiliary contacts, current transformers, terminal arrangements, support structures, and other options can be configured to suit the project.
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Our technical consultants offer 24/7 online consultation to assist you through the entire process, from drawing design and equipment selection to installation guidance.

What is an LW8-40.5 SF6 circuit breaker?

The LW8-40.5 is a three-phase outdoor high-voltage circuit breaker that uses SF6 gas for insulation and arc extinction. It is primarily used to control and protect 35kV transmission and distribution systems with a highest equipment voltage of 40.5kV.

Is 40.5kV the normal operating voltage of the power system?

Not usually. The LW8-40.5 is commonly applied in nominal 33kV or 35kV systems. The 40.5kV value refers to the highest voltage rating of the equipment.

Does the circuit breaker comply with IEC standards?

The LW8-40.5 can be supplied for projects requiring design and testing in accordance with applicable IEC high-voltage switchgear requirements, including IEC 62271-100. The required standard edition, testing scope, and documentation should be specified during the inquiry stage.

Can current transformers be integrated into the circuit breaker?

Optional current transformers may be configured for measurement and protection purposes. Customers should provide the required ratio, accuracy class, burden, number of cores, and secondary wiring arrangement.

Is the LW8-40.5 suitable for high-altitude or heavily polluted areas?

Project-specific configurations may be available for high-altitude, low-temperature, high-humidity, coastal, or polluted environments. The actual altitude, minimum and maximum temperature, pollution level, creepage-distance requirement, wind speed, and seismic conditions must be provided before selection.

What maintenance does an SF6 circuit breaker require?

Routine work normally includes checking gas density or pressure indications, operating-mechanism condition, terminal connections, corrosion, auxiliary circuits, and operation records. Maintenance intervals should follow the supplied manual and the site’s operating procedures.

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