... up to four stages.Could select relay, SSR drive, SCR as control methodCould select 5VDC, 12VDC, 24VDC as auxiliary ... (3A normal open and normal close)W1: contactless SCR output (100-240VAC/0.2A)G: Solid-state relay ... proffestional and experienced manufacturer, we supply process controller, regulator, PID process controller, program process controller, PID temperature controller, Program temperature ...