ZN28-12 Indoor Vacuum Circuit Breaker for 12kV Switchgear
ZN28-12 Indoor Vacuum Circuit Breaker for 12kV Switchgear is a fixed-type vacuum circuit breaker designed for indoor medium-voltage power distribution and metal-clad switchgear systems. With a reliable vacuum interrupter and side-mounted contact structure, it provides stable switching and interruption of load currents, overloads, and short-circuit currents.
Featuring a compact design, spring operating mechanism, and mechanical interlocking system, the ZN28-12 offers reliable operation and convenient integration with existing switchgear cabinets. It is suitable for substations, industrial power distribution panels, transformer protection, and switchgear retrofit projects requiring dependable 12kV circuit protection.
Get a QuoteOverview
The ZN28-12 Indoor Vacuum Circuit Breaker is a 12kV fixed-type vacuum circuit breaker designed for medium-voltage indoor switchgear and power distribution systems. Featuring a reliable vacuum interrupter and side-mounted contact structure, it provides stable switching and interruption performance for load currents, overloads, and short-circuit faults.
Equipped with a spring-operated mechanism compatible with CD10 and CD17 operating mechanisms, the ZN28-12 combines a compact structure with a reliable mechanical interlocking system. It is particularly suitable for fixed metal-clad switchgear, equipment upgrades, and retrofit projects where dependable circuit protection and convenient integration are required.
With its robust construction and reliable electrical and mechanical performance, the ZN28-12 is widely used in substations, industrial facilities, transformer protection systems, and indoor 12kV power distribution networks.
Key Advantages
The ZN28-12 Indoor Vacuum Circuit Breaker combines a fixed installation structure with reliable vacuum interruption technology, providing a practical solution for 12kV indoor medium-voltage switchgear applications.
- Fixed Installation Structure
Designed as a non-withdrawable circuit breaker for fixed-type indoor metal-clad switchgear, providing stable installation and reliable long-term operation. - Side Terminal Configuration
The side-mounted terminal structure facilitates cabinet wiring and simplifies integration with compatible switchgear systems. - Reliable Vacuum Arc Interruption
Uses vacuum interruption technology without insulating gas, providing effective arc extinction, stable switching performance, and reduced maintenance requirements. - Long Mechanical Service Life
Designed for reliable operation over frequent switching cycles, with a mechanical endurance of up to 10,000 operations. - Compliance with International Standards
Designed to meet applicable requirements of IEC 62271-100 and GB 1984, supporting reliable application in medium-voltage power distribution systems.
Technical Data
| Item | Unit | Parameter | |
| Rated Voltage | kV | 12 | |
| Rated Current | kA | 630 / 1250 | |
| Rated Frequency | Hz | 50 | |
| Rated Short-Circuit Breaking Current | kA | 25 / 31.5 | |
| Lightning Impulse Withstand | kV | 75 | |
| Mechanical Life | Times | ≥ 10000 | |
| Operating Mechanism | / | Spring-operated (manual or motor) | |
| Installation Type | Fixed panel-mounted | ||
Overall and mounting dimensions(mm)
Typical Applications
The ZN28-12 Indoor Vacuum Circuit Breaker is suitable for a wide range of 12kV indoor medium-voltage power distribution and switchgear applications:
- Fixed-Type Indoor Medium-Voltage Switchgear
Designed for installation in fixed metal-enclosed switchgear systems for reliable circuit control and protection. - Industrial Power Distribution Panels
Suitable for industrial facilities requiring dependable switching and short-circuit protection for medium-voltage equipment. - Municipal Power Distribution Systems
Used in municipal substations and power distribution facilities to support stable and reliable electrical operation. - Oil, Gas, and Petrochemical Facilities
Suitable as a backup or replacement circuit breaker in industrial power systems where reliable medium-voltage protection is required. - Switchgear Modernization and Retrofit Projects
Its fixed structure and side-terminal configuration make it suitable for upgrading or replacing older indoor switchgear equipment while maintaining cabinet compatibility.
