ESAB Transarc DC303iE is a portable, inverter-based power source for MMA or TIG welding using the scratch start method. The unit provides up to 300A welding current and operates from 415V three-phase electricity supplies. It is housed in an all-metal enclosure, with a fan at the rear providing cooling for the internal semi-conductor components. A thermal sensor built into the unit prevents excessive temperatures should the unit be overdutied. Output is disabled and a front panel warning light illuminated under such circumstances. The unit is fully “offshorised” and incorporates fan air filters.