When selecting complete sets of low-voltage power distribution cabinets, users should not only familiarize themselves with technical parameters-such as rated voltage, rated current, rated frequency, and cabinet dimensions-but also pay close attention to the following aspects:
Maximum Rated Current of Main Busbar: The rated value of the maximum current that the main busbar is capable of carrying.
Rated Short-Time Withstand Current: The RMS value of the short-time withstand current-specified by the manufacturer-that a specific circuit within the complete switchgear assembly can safely carry under the test conditions prescribed in the national standard GB7251.1-2005.
Rated Peak Withstand Current: The peak current value-specified by the manufacturer-that a specific circuit within the complete switchgear assembly can withstand under the test conditions prescribed in the national standard GB7251.1-2005.
Degree of Protection (IP Code): The degree of protection provided by the switchgear enclosure-in accordance with the IEC 60529-1989 standard-against access to live parts, as well as against the ingress of foreign solid objects and liquids. Specific classification levels are defined in the IEC 60529 standard.
Internal Segregation: A method-in accordance with the IEC 60529-1989 standard-of physically dividing the switchgear assembly into distinct compartments with different functions, primarily for the purpose of ensuring personal safety.
Functional Unit Form: The method by which components are installed within the complete switchgear assembly, as defined by the national standard GB7251.1-2005.
