When UPSs are connected in parallel, connect loads to the pL terminal.

When a single UPS works and loads are of the same importance, connect all loads to the sL terminal.

When a single UPS works and loads are divided into two levels, connect the primary load to the sL terminal and the secondary load to the pL terminal.

When the UPS is overloaded, the loads connected to the sL terminal will be powered off first to ensure continuous power supply to the loads connected to the pL terminal.