Core Applications：
Suitable for 12kV power distribution systems in power plants, substations, industrial and mining enterprises, high-rise buildings, etc., for power receiving/distribution, line protection, and high-voltage motor starting. Adaptable to frequent operation and harsh environments (such as condensation and light pollution). Can be combined with ring main units for use in switchgear.
Core Structure and Characteristics：
Independent Functional Compartments: The cabinet is divided into circuit breaker compartment, busbar compartment, cable compartment, and relay compartment, separated by metal partitions for localized fault location; the circuit breaker compartment/busbar compartment is equipped with a pressure relief channel to enhance safety.
Reliable Air Insulation: Phase-to-phase/phase-to-ground air insulation distance ≥125mm, busbars arranged in a triangular pattern, supported by porcelain insulators, sufficient creepage distance, suitable for condensation and polluted environments.
Flexible main switch configuration: Standard configuration includes vacuum circuit breakers such as ZN28-12/ZN63A (VS1), with optional oil-limited/SF₆ circuit breakers; equipped with a rotary disconnect switch, supporting spring/electromagnetic mechanisms, manual/electric operation by Chint Electric.
Comprehensive "Five-Proof" Interlocking: Includes protection against accidental opening/closing, protection against live grounding, and protection against accidental entry into live compartments; reliable mechanical interlocking eliminates human error.
Convenient Maintenance: Circuit breaker compartment is located at the front/middle, allowing for the installation of integrated/split-type circuit breakers; cable compartment wiring height is 600–800mm, facilitating inspection and wiring.
