GN19-12 Series Indoor High Voltage AC Disconnect Switch – 12kV 60Hz Three-Phase Double Power Isolation Knife Switch for Circuit Control
The GN19-12 and GN19-12C series are high-performance indoor high-voltage disconnect switches designed for power systems with a rated voltage of 12kV and three-phase AC 60Hz. These switches are specifically engineered for dividing and closing circuits under voltage but no-load conditions, making them ideal for safe electrical isolation. Featuring a robust three-pole design, the assembly includes a reinforced base frame, high-strength porcelain pillar insulators, and precision-welded gate knives for reliable long-term operation. The versatile rotating shaft extends from the bottom frame, allowing for seamless connection to various operating mechanisms on either side.
GN19-12 Indoor High Voltage AC Disconnect Switch (12kV)
Product Overview
The GN19-12 and GN19-12C series are high-performance indoor high-voltage disconnect switches designed for power systems with a rated voltage of 12kV and three-phase AC 60Hz. These switches are specifically engineered for dividing and closing circuits under voltage but no-load conditions. Known for their versatility, they can function as double power isolation knife switches, providing a clear and visible safety gap for equipment maintenance in indoor power distribution systems.
Core Features & Technical Advantages
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Enhanced Thermal Performance: The contact knife is composed of two slotted copper plates, which increases the heat dissipation area to lower operating temperatures.
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Superior Dynamic Stability: The dual-plate knife design improves mechanical strength and enhances the dynamic stability of the switch during operation.
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Magnetic Locking Technology: Models rated for 1000A and 1250A include a magnetic locking plate that enhances contact attraction during large short-circuit currents.
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Robust Insulation Structure: Each phase is supported by two high-strength pillar insulators (GN19-12) or a combination of pillar and porcelain casing insulators (GN19-12C).
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Flexible Operating Connection: The rotating shaft extends beyond the base frame, allowing it to be easily connected to manual or electric operating mechanisms from either side.
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Proven Three-Pole Design: Features a parallel three-phase installation consisting of a base frame, rotating shaft, lever, and gate knife assembly for synchronized action.
Technical Specifications
| Item | Unit | Data |
| Rated Voltage | kV | 12 |
| Rated Frequency | Hz | 60 |
| Rated Current Options | A | 400, 630, 1000, 1250 |
| Phase Configuration | – | Three-pole parallel |
| Compatible Mechanism | – | CS6-1 type moving mechanism |
Standard Working Conditions
To ensure safe operation, the following environmental standards must be met:
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Ambient Air Temperature: Upper limit +40°C, lower limit -10°C (Storage/Transport allowed at -25°C).
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Altitude: Not exceeding 1,000 meters.
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Relative Humidity: Daily average ≤95%; monthly average ≤ 90%.
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Air Quality: The surrounding area must be free from corrosive or combustible gases, water vapor, and obvious pollution.
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Mechanical Stability: The installation site must be free from regular and violent vibrations.
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