Thermal Dynamics® Custmaster A120 460 V With SL100 25' Torch. The A-Series includes the SL100® SV 1Torch® with standard ATC Quick Disconnect in lengths of 25 ft. The 1Torch start technology eliminates the electronic interference that can occur with other designs. 1Torch provides quick, reliable starts and a strong pilot arc to pierce heavy plate. With auto-pilot restart, it can also cut expanded metal quickly and easily. With all the advantages of 1Torch and proven reliability, the automated A-Series delivers the best in productivity, precision and performance.