I-WLD2975 Frequency Voltage Protection Device (eyaziwa nangokuthi i-Low Frequency Low Voltage Load Shedding Device) iyisistimu yokuvikela ehlakaniphile esetshenziselwa ukulawula ukuzinza kwamandla kagesi kanye nevoltheji, esetshenziswa kakhulu ezindaweni ezifana neziteshi zamandla elanga (photovoltaic power stations), amapulazi omoya (wind farms), iziteshi zamandla ezishisa amalahle (thermal power plants), neziteshi zikagesi (substations). Umsebenzi wayo oyinhloko ukugadla amapharamitha omfutho kagesi kanye nevoltheji enethelini, futhi uma kukhona okungajwayelekile ohlelweni, izosika ngokuzenzakalelayo ingxenye yemithwalo (loads) noma yenze imisebenzi yokuhlukanisa (disconnection), ukuqinisekisa ukusebenza okuphephile nokuzinzile kwenetheli.