Intertron Model 375 10 Station Interlock Scanner In NEMA 12 Cabinet Features: Interlocks One to Ten Welding Machines Enables Only One Welder at a Time by Polling in a Sequentially Wired System Optically Isolated Inputs Direct Interface to Single and 3 Phase Intertron Industries Inc. made Welding Controllers Relay Closure Contacts Input and Output for Interface with Other Types of Welding Controllers Power Input 110 VAC/30 VA Scanner Circuit Board: Intertron Products: Single Phase: 100 | PC100 | 105 | 108 109A | IN200/300 | 375 | 1000 Three Phase: 301B | 302A | 302C | 375