Intertron Model 100 Single Phase Bench Welder Controller Features: Simple Operation 1-15 Impulses 1-15 Cool Time 00-99 Heat Time 1/2 Cycle Alternate Firing 00-99 Heat % # 1 00-99 Heat % # 2 Repeat or One Spot 75 Amp Built-in Air Cooled Contactor 300 Amp Built-in Air Cooled Contactor Intertron Products: Single Phase: 100 | PC100 | 105 | 108 109A | IN200/300 | 375 | 1000 Three Phase: 301B | 302A | 302C | 375