17.5KV Fixed Type Indoor Circuit Breaker

The 17.5KV Fixed Type Indoor Circuit Breaker is designed for medium-voltage power distribution systems requiring reliable switching, protection, and control. It adopts an integrated VET operating mechanism and vacuum circuit breaker design, providing compact dimensions, stable operating performance, and long service life. The sealed pole structure minimizes maintenance requirements while improving insulation reliability and operational safety.

Designed for modern power systems, the 17.5KV Fixed Type Indoor Circuit Breaker is compatible with metal-clad switchgear as well as XGN fixed indoor AC metal-enclosed switchgear. It is widely used in substations, industrial facilities, commercial buildings, utility networks, and renewable energy projects where dependable medium-voltage protection is required.

Actual Product Photos

Product Features

• Integrated VET operating mechanism ensures stable opening and closing performance.
• Fully sealed vacuum interrupter technology delivers maintenance-free operation and extended electrical life.
• Compact fixed-type structure reduces installation space while improving overall reliability.
• The 17.5KV Fixed Type Indoor Circuit Breaker offers excellent dielectric insulation, fast arc extinction, and low contact wear.
• Supports frequent switching operations with mechanical life up to 10,000 operating cycles.
• Compatible with KYN series withdrawable switchgear and XGN fixed switchgear.
• High reliability under continuous industrial operation.
• Easy installation and low lifecycle maintenance cost.

Technical Parameters

Product Dimensions

Structural Design

The circuit breaker integrates the operating mechanism and vacuum interrupter into a compact fixed-mounted structure. Fully encapsulated pole assemblies improve insulation performance while protecting internal components from dust, moisture, and environmental contamination. This design significantly increases operational reliability and reduces routine maintenance requirements.

The spring-operated mechanism ensures fast opening and closing actions with stable mechanical transmission, making the breaker suitable for long-term operation in medium-voltage switchgear systems.

Applications

The 17.5KV Fixed Type Indoor Circuit Breaker is widely used for switching, protection, and control in medium-voltage electrical distribution systems.

• Medium-voltage metal-clad switchgear
• XGN indoor metal-enclosed switchgear
• Utility substations
• Power generation plants
• Industrial manufacturing facilities
• Mining operations
• Metallurgical industries
• Chemical processing plants
• Commercial buildings
• Renewable energy distribution systems

Operating Environment

• Ambient temperature: -10°C to +40°C (storage down to -30°C)
• Installation altitude: ≤1000m (higher altitude available upon request)
• Daily average relative humidity: ≤95%
• Maximum seismic intensity: 8 degrees
• Suitable for environments free from fire hazards, explosion risks, corrosive gases, severe pollution, and excessive vibration.

Why Choose This Product?

• Maintenance-free sealed vacuum interrupter
• Compact fixed installation design
• Long electrical and mechanical service life
• High insulation reliability
• Excellent short-circuit interruption capability
• Compatible with mainstream medium-voltage switchgear
• Stable performance under frequent switching conditions
• Lower operating and maintenance costs

Frequently Asked Questions

What is a 17.5KV Fixed Type Indoor Circuit Breaker used for?

It is used to protect and control medium-voltage electrical equipment by interrupting overload and short-circuit currents in substations, industrial facilities, and power distribution systems.

What switchgear is this breaker compatible with?

It is suitable for KYN series metal-clad withdrawable switchgear as well as XGN fixed indoor AC metal-enclosed switchgear.

What are the advantages of vacuum interruption technology?

Vacuum interrupters provide fast arc extinction, long electrical life, minimal maintenance, high insulation performance, and environmentally friendly operation without SF6 gas.

Can the breaker handle frequent switching operations?

Yes. With a mechanical life of up to 10,000 operations and a durable operating mechanism, it is well suited for applications requiring frequent switching.

Which industries commonly use this product?

It is widely used in utility substations, industrial manufacturing, mining, metallurgy, chemical processing, commercial facilities, and renewable energy power distribution systems.