The Solid State Relay – SSR-40DA-S allows you to control high current AC loads from lower voltage DC control circuitry. Solid-state relays have several advantages over mechanical relays. One such advantage is that they can be switched by a much lower voltage and at a much lower current than most mechanical relays, and since there are no moving contacts, solid-state relays can be switched much faster and for much longer periods without wearing out. https://youtu.be/-pyzuONxZWU Features: Product Name: Solid State Relay SSR-DA Product Features: no sound, no spark, fast response, wide voltage wide, stable, and reliable performance. Applicable to: electric power, chemical, plastic injection, packaging, incubators, ovens, and other industrial equipment automatic switch 100% Brand New and High Quality. Solid State Relay SSR-40DA-S Fast switching Reduced electromagnetic interference Highly reliable, compact size designed to offer users maximum simplicity Specifications: Output current: 40A Input voltage: DC 3-32VDC Output voltage: AC 24-600VAC Control Method: DC to AC Mounting Method: Bolts fixed Package Includes: 1 x Solid State Relay Module SSR-40DA-S Tense