I. Overview
The KYN28A—12(z) (GZSI) type armored drawout AC metal-enclosed switchgear (hereinafter referred to as "switchgear") is suitable for three-phase AC 50Hz power systems. It is used for receiving and distributing electrical energy, as well as controlling, protecting, and monitoring electrical circuits.
This product complies with the following standards:
GB 3906 3～35kV AC Metal-Enclosed Switchgear
GB/T 11022 Common Technical Requirements for High-Voltage Switchgear and Controlgear Standards
IEC 60298 AC Metal-Enclosed Switchgear and Controlgear for Rated Voltages Above 1 kV

II. Normal Service Conditions
1.Ambient air temperature: Maximum temperature +40℃, minimum temperature -15℃;
2.Relative humidity:
 Daily average relative humidity: ≤95%, with daily average water vapor pressure not exceeding 2.2 kPa;
 Monthly average relative humidity: ≤90%, with monthly average water vapor pressure not exceeding 1.8 kPa;
3.Altitude: Below 1000 meters;
4.Seismic intensity: Not exceeding Grade 8;
5.Ambient air shall be free from obvious pollution by corrosive gases, flammable gases, water vapor, etc.;
6.No severe vibration;
7.If the switchgear is used under conditions beyond the normal scope specified in GB 3906, it shall be negotiated between the user and our company.