GCK low-voltage pull-out switch cabinet is composed of power distribution center (PC) cabinet and motor control center (MCC). It is suitable for power users such as power plants, substations, industrial and mining enterprises as ac 50Hz, the maximum working voltage to 660V, the maximum working current to 3150A in the distribution system.  As power distribution, motor control and lighting and other power distribution equipment conversion and distribution control. This series of products has high breaking capacity, good dynamic and thermal stability, advanced and reasonable structure, and practical electrical scheme. It has the advantages of strong versatility, any combination of various scheme units, more circuits accommodated in one cabinet, saving floor space, beautiful appearance, high protection level, safety and reliability, and convenient maintenance. This product complies with IEC 439 NEMA ICS 2-322 standard, as well as GB 7251-2005 (low-voltage switchgear) national standard and ZBK 36001 (low-voltage withdrawable switchgear) professional standard.1. Ambient air temperature: -5~+40 and the average temperature should not exceed +35 in 24h. 2. Install and use indoors. Altitude above sea level for operation site should not exceed 2000M. 3. Relative humidity should not exceed 50% at max temperature +40. Higher relative humidity is allowed at lower temperature. Ex. 90% at +20. But in view of the temperature change, it is possible that moderate dews will produce casually. 4. Installation gradient not exceed 5. 5. Install in the places without fierce vibration and shock and the sites insufficient to erode the electrical components. 6. Any specific requirement, consult with manufactory.