div class=trans-pagebuttonPage 1button div class=trans-image a href=https:reader042fdocumenticomreader042viewer20220405135e675c95cf561c2b03681727html5page1jpg target=_blank amp-img class=trans-thumb alt=Page 1: Relè di minima tensione continua undervoltage relay Relè di frequenza frequency relay Relè di selezione o commutazione automatica automatic selective control or transfer relay src=https:reader042fdocumenticomreader042viewer20220405135e675c95cf561c2b03681727html5thumbnails1jpg width=142 height=106 layout=responsive amp-imga divdiv