Product Overview

The VX3-12 series lower disconnect & lower earthing circuit breaker unit is a core modular component specially developed for 12kV environmentally friendly gas-insulated ring main units (RMUs). It adopts a unique lower-disconnect and lower-earthing layout, integrating a circuit breaker, disconnect switch and earthing switch into one frame. This integrated module realizes circuit breaking, visible isolation and maintenance earthing, perfectly matching the structural design of compact eco-gas ring main cabinets.

Key Advantages

1. Specialized Lower Layout Structure

   Disconnect and earthing switches are arranged at the lower section of the frame. This design optimizes the vertical space layout of the cabinet, leaving ample space for cable wiring at the upper part of the switchgear. It simplifies cable routing and field wiring work.

2. Complete Mechanical Interlock Protection

   Standard reliable mechanical interlock is equipped to prevent misoperation:

   • The disconnect switch and earthing switch cannot be operated when the circuit breaker is closed.
   • The circuit breaker is locked and cannot be closed when the earthing switch is engaged.

   Physical interlocking meets IEC safety standards and effectively protects maintenance personnel.

3. Excellent Insulation & Current Withstand Capacity

   High-performance red insulating covers are adopted for phase-to-phase and phase-to-earth insulation. Precision-machined conductive parts maintain stable contact pressure, ensuring outstanding performance under rated current and short-circuit withstand conditions.

4. Environmentally Friendly, SF₆-Free Design

   Compatible with dry air, nitrogen and other environmentally friendly insulating media. It avoids the use of SF₆ greenhouse gas, complies with global low-carbon power grid standards, and reduces later maintenance and gas processing costs.

5. Modular Pre-Assembly & Strong Compatibility

   Standardized mounting holes support offline pre-assembly, which significantly improves cabinet assembly efficiency. Manual and motorized operating mechanisms are optional, compatible with mainstream environmentally friendly gas-insulated RMU solutions.

Typical Application Scenarios

• Urban municipal 10kV ring distribution switchgear
• Power distribution rooms for industrial parks, commercial buildings, data centers and hospitals
• Feeder units of photovoltaic and wind power box transformers
• New construction and transformation projects of low-carbon eco-gas insulated ring main units

Reference Technical Specifications

• Rated Voltage: 12 kV
• Rated Frequency: 50 Hz
• Layout: Lower disconnect, lower earthing integrated circuit breaker unit
• Compatible Insulating Medium: Dry Air / Nitrogen (environmentally friendly gas)

Short E-commerce Version (Directly for Online Store)

VX3-12 lower disconnect & lower earthing circuit breaker unit is a core module for 12kV environmentally friendly gas insulated ring main units. Its unique lower layout reserves sufficient space for upper cable wiring. Equipped with complete mechanical interlocks to avoid dangerous misoperation. SF₆-free design supports dry air and nitrogen insulation. Widely used in municipal, industrial and new energy power distribution projects. Modular pre-installation available, with optional manual or motorized operating mechanisms.