Ang XL-21 power distribution box ay isang panloob na device, na angkop para sa mga civil power plant at pang-industriya at pagmimina, AC frequency 50Hz, AC boltahe 380V, three-phase three-wire, three-phase four-wire power system. Ito ay ginagamit para sa power at lighting distribution at control, at maaari ding gamitin para sa iba pang okasyon na nakakatugon sa load performance ng power distribution box, tulad ng: indoor computer rooms, pabrika, urban electricity, construction industry.