I. Product Introduction:

XL21 low-voltage power distribution box is suitable for the 50 hz, rated voltage of 400 v, rated current 630 a low voltage distribution network, the product has high dust, moisture, corrosion and other features, anti-aging, good impact resistance, has been widely used in steel, chemical, electric power, electronic, ports, airports, mines, oil exploration, food, subway and car manufacturing all kinds of industrial and mining enterprises in the distribution network.
XL21 low-voltage power distribution cabinet conforms to the requirements of IEC439-1 "Low-voltage Complete Switch Equipment and Control Equipment" and the standard GB7251 "Low-voltage Complete Switch Equipment and Control Equipment".
Equipment installation can be divided into ground installation type, suspension installation type, can be applied to different climate and different regional conditions of the place or occasion; According to the choice of components, the box can be divided into two types: high-end type and economic type, to meet the needs of different users.
The frame is processed into structural parts with high-quality cold-rolled steel plate and special hinge, which makes the box body extremely strong, flexible, convenient and universal. All panels, side seals and protection plates are of detachable type, easy to repair and test. The surface treatment of the cabinet is galvanized or electrostatic spraying, which is beautiful, durable and anticorrosive.
 
Environmental Conditions:
Altitude: ≤2000m;
Ambient temperature: -25℃~+40℃, and its average temperature within 24h ≤+35℃; The lower limit of ambient air temperature is -25℃ in temperate regions and -50℃ in severe regions.
Atmospheric conditions: the air is clean, the relative humidity is not more than 50% at ** temperature of +40℃, and higher relative humidity is allowed at lower temperature, such as 90% at +20℃, but temperature changes should be taken into account, it is possible to occasionally produce moderate condensation;
Tilt not more than 5 degrees from the vertical plane;
Surrounding environment: The pollution level is 3, the intensity of the earthquake is less than 9;
If the user has special requirements, they can negotiate with the manufacturer to solve.

• technical parameters：

project	Unit	Parameter
Rated voltage of main circuit	V	380(660)
Rated voltage of auxiliary circuit	V	380（220）
insulation voltage	V	660
rated frequency	Hz	50
Rated ** operating current	A	100-630
Rated short circuit switching current	KA	15
Main circuit power frequency withstand voltage1min	V	2500
electric clearance	mm	≥20
enclosure protection class		IP30-IP54
Overall dimension (Width × depth × height)	㎜	600（700、800）×400（500）×1600（1800、2000）

• ordering instruction

21. The main circuit scheme number and the auxiliary circuit scheme number of the product;
21. Main circuit system combination sequence diagram;
21. Electrical schematic diagram of auxiliary circuit;
21. Model specifications and relevant parameters list of components in the cabinet;
21. Other special requirements not in conformity with the normal conditions of use.