Medium Voltage Air Insulated Switchgear for Primary Distribution
| Brand | ROCKWILL |
| Model NO. | Medium Voltage Air Insulated Switchgear for Primary Distribution |
| Rated voltage | 12kV |
| Rated frequency | 50Hz |
| Series | KYN28A |
Product Description
KYN28A-12 (GZS1) Indoor AC Metal-Clad Withdrawable Switchgear (hereinafter referred to as KYN28A Switchgear) is a single-bus and single-bus sectionalized switchgear designed for three-phase AC 50Hz systems with a rated voltage of 12kV. Primarily used in power plants, small generator transmission systems, consumer substations, industrial and mining enterprises, and for large high-voltage motor starting applications, it serves for power reception and distribution, circuit control, and protection. Equipped with five anti-misoperation interlock functions—preventing withdrawal/insertion of the circuit breaker cart under load, preventing incorrect opening/closing of the circuit breaker, preventing movement of the circuit breaker cart in the closed position, preventing entry into live compartments, and preventing earthing switch operation when live—it is a high-performance power distribution device.
Mechanical Data
| No. | Items | Unit | Value |
| 1 | Rated voltage | kV | 12 |
| 2 | Rated insulation level | ||
| 3 | Rated lightning impulse withstand voltage (peak) | kV | Phase-to-phase & phase-to-earth: 75, Fracture: 80 |
| 4 | Short-time power frequency withstand voltage (1min | kV | Phase-to-phase & phase-to-earth: 42, Fracture: 48 |
| 5 | Rated current | A | 630, 1250; 630–3150; 1250–4000 |
| 6 | Rated short-time withstand current | kA | 20; 25; 31.5; 40 |
| 7 | Rated withstand current (peak) | kA | 50; 63; 80; 100 |
| 8 | Secondary circuit frequency withstand voltage (1min) | V | 2000 |
| 9 | Rated duration of short circuit | s | 4 |
| 10 | Degrees of protection | - | IP4X |
| 11 | Net weight | kg | 1500 |
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