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This product is a gas-puffer load-break switch–fuse combination unit, suitable for three-phase distribution systems at 12kV and below, used for the control and protection of transformers, cables, overhead lines, and other electrical equipment, particularly suited to terminal substations and box-type substations on urban and rural grids.
Features:
Adopting the gas-puffer arc-extinguishing principle, the switching operation is simple and reliable; combined with a fuse, it delivers the dual functions of load control and short-circuit protection, with a compact and small structure that is easy to install and maintain, and offers good operating stability.
Applications:
Suitable for the control and protection of ring-main supply units and dual-radial supply units, widely serving terminal substations, box-type substations, and various industrial/mining distribution locations on urban and rural distribution grids, and is a commonly used combination switching electrical appliance in medium- and low-voltage distribution systems.
| Item | Unit | FKN12-12/630 | FKNR12-12/100-31.5 |
| Rated Voltage | kV | 12 | |
| Rated Frequency | Hz | 50 | |
| Rated Current | A | ||
| Lightning Impulse Withstand Voltage | kV | Phase to earth and phase to phase: 75, isolating break: 85 | |
| 1min Power Frequency Withstand Voltage | kV | Phase to earth and phase to phase: 42, isolating break: 48 | |
| Rated Thermal Withstand Current | kA | 20(4S) | |
| Rated Dynamic Withstand Current | kA | 50 | |
| Rated Short-Circuit Making Current (Peak) | kA | 50 | 50 |
| Rated Short-Circuit Breaking Current (Prospective Value) | kA | 31.5 | |
| Rated Transfer Current | kA | 1.5 | |
| No-Load Transformer Breaking Capacity | kVA | 1250 | |
| Rated Cable Charging Current | A | 10 | |
| Mechanical Life | 次 | 4000 | |
Zhejiang Yingchuang Electric Co., Ltd. was established in March 2018 and is a qualified approved supplier for State Grid and China Southern Power Grid. We specialize in the R&D and manufacturing of high-voltage electrical equipment, including primary-and-secondary integrated pole-mounted circuit breakers, indoor/outdoor vacuum circuit breakers, disconnecting switches, ring main units, and complete switchgear assemblies. Guided by "craftsmanship quality and sincere service," we offer full OEM/ODM customization across our entire product range. In 2024, we were recognized as a Provincial Innovative SME and a National High-Tech Enterprise.
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