1 uses: SRX-21 type low voltage power distribution box is suitable for the power plant and industrial and mining enterprises in the 50Hz, 500V of the following three-phase three wire, three-phase four wire is not frequent operation of power distribution system for power or lighting distribution.

2 applies to the following working conditions:

A: indoor use

B: no more than 2000 meters above sea level

C: ambient air temperature is not less than -5, not higher than +40

D: relative humidity: when the ambient air temperature is 40 DEG C does not exceed 50%, under the low temperature may have a higher relative humidity (such as + 25 DEG C to 90%) taking into account changes in temperature allowing modest gel

E: a place where there is no conductive dust and corrosive gases that destroy the metal

F: there is no danger of explosion.

G: no vibration and bumps and inclination of not more than 5 degrees place