This series of products adopts imported American Fairchild optocouplers and high-performance microchips, advanced glue filling and heat dissipation technology, all products undergo 48-hour aging test, with long service life, high safety, fast switching speed, no sparks, No noise, no contact, no electromagnetic interference, strong anti-interference performance, etc., the entire series of products can be replaced in two years for quality problems. For selection, please refer to details or consult customer service.