VZG-12GD Indoor 12kV Three-Station Vacuum Circuit Breaker
VZG-12GD Indoor 12kV Three-Station Vacuum Circuit Breaker is a compact integrated switching device designed for 3.6–12kV indoor medium-voltage power systems. It combines vacuum circuit breaking, circuit isolation, and grounding functions in one modular assembly, providing reliable protection and control for industrial, mining, and power distribution applications.
Featuring fixed sealing technology, reliable mechanical and electrical interlocking, and a modular operating mechanism, the VZG-12GD ensures safe switching and prevents incorrect operation. Its compact structure, maintenance-friendly design, and manual or remote operating options make it suitable for modern indoor metal-enclosed switchgear requiring reliable isolation, grounding, and long-term stable operation.
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The VZG-12GD Indoor High-Voltage Three-Position Vacuum Circuit Breaker is a compact and reliable switching device designed for 3.6–12kV power systems. It combines dependable electrical and mechanical performance with a stable operating mechanism and long service life, making it suitable for power distribution, protection, and control applications in industrial and mining facilities.
Featuring fixed sealing technology and modular construction, the VZG-12GD integrates a sealed vacuum circuit breaker, rotary disconnector, grounding switch, sensors, interlocking mechanisms, and operating mechanism into a compact assembly. The fixed sealed main circuit improves environmental adaptability and insulation reliability while supporting maintenance-free operation.
The breaker incorporates complete mechanical and electrical interlocking between the circuit breaker, disconnector, and grounding switch to help prevent incorrect operation. The rotary disconnector provides a visible isolation position after opening, while the grounding switch and cabinet door are equipped with additional safety interlocks to protect operators during inspection and maintenance.
With a modular operating mechanism, the main operating components can be independently replaced or maintained, providing good interchangeability and convenient servicing. Manual operation and remote control are available through AC or DC energy-storage configurations. Compatible with 450 × 1000 × 1800mm cabinet dimensions, the VZG-12GD provides a compact solution for modern indoor medium-voltage switchgear.
Technical Data
| Item | Unit | Parameter | ||
| Rated voltage | kV | 12 | ||
| (1 minute) Rated short-time power frequency withstand voltage: phase to phase/fracture | 42 / 48 | |||
| Rated lightning impulse withstand voltage (peak): phase to phase/fracture | 75 / 85 | |||
| Secondary circuit power frequency withstand voltage (1min) | 2 | |||
| Rated frequency | Hz | 50 | ||
| Rated current | A | 20 | 25 | 31.5 |
| Rated short-circuit breaking current | kA | 50 | 63 | 80 |
| Rated peak withstand current | 50 | 63 | 80 | |
| Rated short-circuit closing current | 20 | 25 | 31.5 | |
| 4s rated short-time withstand current | 20 | 25 | 31.5 | |
| Rated short-time withstand current duration | s | 4 | ||
| Rated breaking current of single/back-to-back capacitor bank | A | 630 / 400 | ||
| Rated capacitor bank closing inrush current | kA | 12.5 (frequency not exceeding 1000Hz) | ||
| Rated short-circuit current breaking times | Times | 30 | ||
| Mechanical lifespan (isolating switch/circuit breaker/grounding switch) | / | 3000/10000/3000 | ||
| Allowable cumulative thickness of wear for dynamic and static contacts | mm | 3 | ||
| Rated closing operation voltage | V | AC24/48/110/220
DC24/48/110/220 |
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| Rated opening operation voltage | ||||
| Rated voltage of energy storage motor | AC24/48/110/220
DC24/48/110/220 |
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| Rated power of energy storage motor | W | 70 | ||
| Energy storage time | S | 15 | ||
| Contact opening distance | mm | 9±1 | ||
| Overtravel | 3.5±1 | |||
| Contact closing bounce time | ms | ≤2 | ||
| Three phase asynchronous opening and closing | ≤2 | |||
| Opening time (rated voltage) | 40 | |||
| Closing time (rated voltage) | 60 | |||
| Average opening speed (contact just opened~6mm) | m/s | 0.9~1.3 | ||
| Average closing speed (6mm~just closed contact) | 0.5~1.1 | |||
| Contact opening rebound amplitude | mm | ≤2 | ||
| Contact closing contact pressure | N | 2400±200(20-25kA)3100+200(31.5kA) | ||
| Rated operating sequence | / | O-0.3s-CO-180s-CO | ||
Overall and mounting dimensions(mm)
