| Brand | ROCKWILL |
| Model NO. | Indoor metal-clad withdrawable switchgear for Power plants-3.6kV to 24kV |
| Rated voltage | 12kV |
| Rated frequency | 50/60Hz |
| Series | KYN28 |
The KYN28 indoor metal-clad withdrawable switchgear(hereinafter short as switchgear) is a complete power distribution device for 3.6-24kV,3-phase AC 50Hz,single-bus and single-bus sectionalized system. It is mainly used for power transmission of small and medium-sized generators in power plants; power receiving, transmission for substations in power distribution and power system of factories, mines and enterprises, and starting of large high-voltage motor, etc,so as to control, protect and monitor the system.
The switchgear meets IEC 62271-200,GB/T 3906-2020.In addition to be used with domestic VS1 vacuum circuit breaker, it can also be used with VD4 from ABB,3AH3 from Siemens,domestic ZN65A,and VB2 from GE, etc,it truly is a power distribution device with good performance.
Centralized (Draw-out) Layout
Armored Compartmentalization
Standardized Modular Design
Excellent performance
Flexible Maintenance
| No. | Item | Unit | Parameter |
|---|---|---|---|
| 1 | Rated voltage | kV | 3.6/7.2/12/24 |
| 2 | Rated frequency | Hz | 50/60 |
| 3 | Rated current | A | 630,1250,1600,2000,2500,3150,4000 |
| 4 | Branch busbar Rated current | A | 630,1250,1600,2000,2500,3150,4000 |
| 5 | Main busbar Rated current | A | 630,1250,1600,2000,2500,3150,4000 |
| 6 | 1min Power frequency withstand voltage—phase-to-phase
1min Power frequency withstand voltage— Across open contacts |
kV
kV |
18/20/42/50 20/28/48/60 |
| 7 |
Lightning impulse withstand voltage —phase-to-phase Lightning impulse withstand voltage—Across open contacts |
kV |
40/60/75/125 46/70/85/145 |
| 8 | Rated short circuit breaking current (peak) | kA | 40/50/63/80/100 |
| 9 | Short time withstand current(4s) | kA | 20/25/31.5/40 |
| Ambient air temperature — upper limit | +40 °C |
| Ambient air temperature — 24 h average | +35 °C |
| Ambient air temperature — lower limit | –25 °C |
| Altitude above sea level | ≤ 1 000 m |
| Relative humidity — 24 h average | ≤ 95% (at +40 °C) |
| Relative humidity — monthly average | ≤ 90% |
| Water vapour pressure — 24 h average | ≤ 2.2 kPa |
| Water vapour pressure — monthly average | ≤ 1.8 kPa |
| Solar radiation | ≤ 1 000 W/m² |
| Wind speed (outdoor) | ≤ 34 m/s (mild) |
| Pollution degree (indoor) | Class II |
| SF₆ gas decomposition products | ≤ 1 μL/L (SO₂F₂) |
VS1 (domestic), ABB VD4, Siemens 3AH3, ZN65A (domestic), GE VB2 — freely exchangeable drawers.
Yes. The withdrawable design enables flexible maintenance — circuit breaker units can be withdrawn for inspection or replacement without de-energizing the entire system.
Yes. Features excellent performance through advanced design, high-quality materials, and proven reliability in diverse applications.
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