I. Outline Dimension Drawing
The XL-21 type power distribution cabinet is suitable for power plants and industrial and mining enterprises. It is used in three-phase three-wire, three-phase four-wire, and three-phase five-wire systems with an AC voltage of 500V or below, serving as power and lighting distribution.
The XL-21 type power distribution cabinet is an indoor device, installed against the wall, and maintained from the front of the panel.
II. Operating Environment Conditions
1.Ambient Temperature: -5℃ to +40℃, and the average temperature within 24 hours shall not exceed +36℃;
2.Altitude: Not more than 2000 meters;
3.Relative Humidity: When the ambient air temperature is +40℃, the relative humidity shall not exceed 50% (note: the original “500%” is a typo, corrected to the industry-common “50%”); higher relative humidity is allowed at lower temperatures (e.g., 90% at +20℃, note: the original “900%” is a typo, corrected to “90%”). Moderate condensation is permitted considering temperature changes;
4.Installation Inclination: The inclination angle of the device relative to the vertical plane shall not exceed 5°. The device shall be installed in a place free from severe vibration, impact, and corrosion.
III. Product Structure
The XL-21 type low-voltage power distribution cabinet is an indoor power distribution device installed against the wall, with a single front-opening door. Its basic structure is made of bent steel plates and welded angle steel. A knife switch operating handle can be installed on the front right side for cutting off and connecting the power supply. Operation buttons, indicator lights, and display instruments can be installed on the cabinet door. When the cabinet door is opened, all internal equipment of the distribution cabinet is exposed, facilitating maintenance and service.
In addition to air circuit breakers and fuses for short-circuit protection, this distribution cabinet is also equipped with contactors and thermal relays. Grounding screws are welded on both the door and the cabinet body to ensure reliable connection between the cabinet body and the ground.