The S-XL dual power box is suitable for emergency power distribution systems with dual power automatic switching, automatic starting, and automatic stopping for AC 50Hz and rated current up to 630A. It has functions such as voltage detection, communication interface, and electrical mechanical interlock. The unit part has various functions that an automatic unit should have, including fully automatic, remote control, forced "0" setting, and emergency manual operation. It is widely used for automatic starting and automatic conversion of common and backup power sources in power supply systems. Mainly used in areas such as banks, hospitals, shopping malls, public places, hotels, data centers, factories, airports, fire protection systems, etc. that cannot be powered off.