Input Supply - 230/ 415 V AC, 50/ 60 Hz; output - built-in back-to-back thyristors drive transformers up to 90 A primary current; weld time - 0-99 cycles (half cycles of input supply frequency); weld energy - 0-100% adjustable by potentiometer (corresponding to firing angle of 170° to 30°); trigger - external, normally open contact, actuates at contact closure; trigger delay - 0.1-3.0 sec (adjustable by potentiometer); indicators - mains On, Weld; and dimensions - 100 (W) x 192 (H) x 300 mm (D).

Easy to read thumbwheel switches for setting number of welding cycles; timings set in terms of "half cycles" of mains supply frequency to get better resolution; precise time and energy control ensures consistent weld quality; and built-in compensation against fluctuations in the mains supply voltage.