Square D Type HD 3 Pole 150 Amps HD Series Also called the following depending on AmperaGeneral Electric, HD 030, HD060, HD 100 and HD 150. The Interrupting Capacity of this type of Circuit Breaker is 18,000 @ 480 Volt and will fit in all Square D I-Line Panelboards old and new. This Circuit Breaker is Plug-in manufactured from 15 to 150 amp including half sizes 25,35 and 45 Amp