The VCB ZN63(VS1)-12 handcart type vacuum circuit breaker is a medium-voltage switching device designed for reliable operation in power distribution systems up to 12 kV. This draw-out (removable) design combines advanced vacuum interruption technology with a compact, modular construction, making it suitable for indoor switchgear applications in industrial plants, commercial buildings, and utility substations.Key Features:1. Vacuum Interruption Technology The breaker utilizes a vacuum interrupter as the arc-quenching medium, providing maintenance-free operation with high dielectric strength and consistent performance over thousands of operations. The vacuum chamber ensures rapid arc extinction, limiting contact erosion and extending service life.2. Handcart (Draw-Out) Design The breaker is mounted on a movable chassis with rolling wheels, allowing easy insertion/withdrawal from switchgear compartments. Mechanical interlocks prevent operation when disconnected, while racking mechanisms ensure proper alignment. The design supports three positions: "Connected," "Test," and "Disconnected."3. Compact Modular Construction With dimensions optimized for standard switchgear panels, the breaker features a space-saving vertical arrangement of components. The insulated housing provides protection against environmental contaminants.4. Spring-Operated Mechanism A motor-charged spring mechanism enables quick closing/opening (typically 2–3 cycles per second) with low energy consumption. Manual charging options are available for backup.5. Protection & Monitoring Integrated with overcurrent, short-circuit, and earth fault protection relays. Auxiliary contacts facilitate remote monitoring of breaker status (open/closed/spring charge).Technical Specifications: - Rated Voltage: 12 kV - Breaking Current: 25–31.5 kA - Continuous Current: 630–1250A - Mechanical Life: ≥10,000 operations - Insulation: 42 kV power frequency withstand Applications: - Primary power distribution in industrial facilities - Transformer protection in ring main units - Feeder control in renewable energy plants Advantages: - Safety: Fully insulated live parts and grounded chassis. - Reliability: Minimal maintenance due to vacuum technology. - Flexibility: Compatible with various protection schemes. The VCB ZN63(VS1)-12 exemplifies modern medium-voltage protection, combining robust performance with user-friendly maintenance features for critical power infrastructure.