The overall structure of the VXB-12P series indoor vacuum circuit breaker adopts a front-to-back arrangement, with the operating mechanism in the front and the interrupters in the rear. The primary conductive circuit features a three-phase floor-standing structure. This structural design better matches the mechanical operational characteristics of the operating mechanism with the switching requirements of the vacuum interrupters. By eliminating intermediate links, it reduces energy consumption and noise, rendering the circuit breaker's performance more reliable.
The operating mechanism is a planar-arranged spring mechanism with manual energy storage capability. It is housed in the mechanism enclosure located in front of the vacuum interrupters. This mechanism enclosure also serves as the structural frame for operation, allowing the operating mechanism and the frame enclosure to be assembled independently. The energy storage, closing, and tripping modules of the mechanism feature fewer components, a compact and simple structure, and high reliability.
Ambient Temperature: +35 °C to -25 °C (storage and transport allowed at -30 °C)
Altitude: Up to 2,000 m (above sea level)
Relative Humidity:
Daily average: ≤ 95%
Monthly average: ≤ 90%
Seismic Intensity: Up to 8 degrees (on the seismic scale)
Operating Environment: Free from risk of fire, explosion, severe pollution, chemical corrosion, and severe vibration.
Note: If the service conditions exceed the above limits, the user shall consult and settle the matter with the manufacturer.
High-Performance Interrupter Standard: Fully compliant with E2-C2-M2 performance classes for high-standard circuit breakers.
Low Restrike Rate: Demonstrates an extremely low probability of restrike during specified capacitive current breaking type tests.
Superior Corrosion Resistance: Key internal operating mechanism components undergo advanced surface treatment, delivering exceptional anti-fouling and anti-corrosion performance.
Excellent Electrical Conductivity: Employs advanced process controls to precisely manage the plating quality and thickness of main circuit components, ensuring consistently low loop resistance.
High Insulation Level: Features an optimized new vacuum interrupter, long creepage distance contact arm bushings, and extended contact arms, significantly raising the overall insulation capability to meet operating requirements at altitudes up to 2,000 m.
Ease of Maintenance: Modular operating mechanism designed with high manufacturing precision for simple, straightforward maintenance.
Generous Current-Carrying Margin: Successfully passed temperature rise type tests conducted by authoritative testing institutions.
Stable Performance: Manufactured on top-tier automated assembly and testing lines with specialized tooling, ensuring exceptional performance and batch-to-batch consistency.
High Interchangeability: High-precision component machining and assembly ensure excellent interchangeability.
Modular Design for Easier Assembly and Commissioning
Optimized Transmission Design
The mechanism cam directly drives the main shaft, reducing intermediate transmission links, improving transmission efficiency, and lowering energy consumption.
Fewer mechanism components ensure exceptionally high reliability.
The mechanism can be equipped with an integrated manual energy-storage handle.
Tool-less & Independent Maintenance
In the event of electrical component failure during operation, replacement does not involve mechanical transmission parts, leaving the overall performance of the product unaffected:
Snap-on Solenoid Mount: Replacement requires removing only a single screw.
Field-Replaceable Motor Module: Servicing and replacement do not interfere with mechanical components or affect product performance.
Extended Service Life & Low Maintenance
Combined with high-performance, long-life lubricants and superior corrosion-resistant surface treatment, the maintenance interval is significantly extended, reducing total maintenance costs.
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