KYN28-12(Z) (GZS1) Air-Insulated Metal-Clad Switchgear for indoor distribution equipment, is suitable for use in three-phase AC 50Hz power systems, for receiving and distributing electrical energy, as well as for controlling, protecting, and monitoring circuits.
All-metal modular construction – High-strength imported galvanized steel, CNC-formed, multi-bending technology, rivet nut & bolt assembly – high precision, light weight, strong.
Wide breaker compatibility – Accepts VS1, VD4, ZN65 series vacuum circuit breakers; good interchangeability.
Withdrawable truck – Service & test positions, each with position lock and indicator – safe & reliable.
Cable compartment – Holds up to 9 single-core cables.
Full interlocking – Mechanical & electrical interlocks fully meet "five-prevention" requirements.
Pressure relief – Each compartment has pressure relief channels for operator safety.
Operating Conditions
Ambient air temperature: Maximum +40℃， Minimum -15℃.
Relative humidity: Daily average relative humidity ≤ 95%， daily average water vapor pressure not exceeding 2.2kPa； Monthly average relative humidity ≤ 90%， monthly average water vapor pressure not exceeding 1.8kPa.
Altitude: ≤ 1000m.
Seismic intensity: Not exceeding magnitude 8.
The ambient air shall be free from significant contamination by corrosive or flammable gases, water vapor, etc..
No locations with severe vibration.
When used under conditions exceeding the normal conditions specified in GB3906, the user shall consult with our company.
Main Technical Parameters
| Parameter | Unit | Values |
| Rated Voltage | kV | 3.6 / 7.2 / 12 |
| Rated Frequency | Hz | 50 |
| Breaker / Switchgear Rated Current | A | 630 / 1250 / 1600 / 2000 / 2500 / 3150 |
| Short-Time Withstand Current (4s) | kA | 20 / 25 / 31.5 / 40 |
| Peak Withstand Current | kA | 50 / 63 / 80 / 100 |
| Short-Circuit Breaking Current | kA | 20 / 25 / 31.5 / 40 |
| Short-Circuit Making Current (Peak) | kA | 50 / 63 / 80 / 100 |
| Power Frequency Withstand (1min) | kV | 24 / 32 / 42 (phase/earth & across gap) |
| Impulse Withstand (Peak) | kV | 40 / 60 / 75 (phase/earth); 46 / 70 / 85 (across gap) |
| Protection Rating | Enclosure: IP4X; Doors open: IP2X |
