Check the listing for details. Professional High Quality 40DA SSR SOLID STATE RELAY for Temperature Controller. Condition: New. Listed at 5.99 USD. About SSR:A solid state relay (SSR) is an electronic switch, which, unlike an electromechanical relay, contains no moving parts. The types of SSR are photo-coupled SSR, transformer-coupled SSR, and hybrid SSR. A photo-coupled SSR is controlled by a low voltage signal which is isolated optically from the load.The control signal in a photo-coupled SSR typically energizes an LED which activates a photo-sensitive diode. The diode turns on a back-to-back thyristor,silicon controlled rectifier, or MOSFET transistor to switch the load. 40A SSRFeatures: -Reliable SMT technology -High ultra insulation resistance over 50M¦¸/500V DC -High dielectric over more than 2.5KV -Low enable current less than 7.5mA/12V DC, compatible with CMOS IC or TTL -Low EMI/EFI & surge by zero cross trigger method -High surge current over 410A/one cycle (60Hz) -High surge voltage duration by snubber circuit Specifications: -Load Voltage: 24-380VAC -Load Current: 40 A -Input Voltage: DC 3-32V Package content: 1pcs Solid state relay for temperature controller On Mar-17-22 at 00:57:22 PDT, seller added the following information: