A solid S tate Relay (SSR) is an electronic switch, which contains no moving parts. Its load current is conducted by one or more semiconductors. The types of SSR are photo-coupled SSR, transformer-coupled SSR, and hybrid SSR. Specifications: Model NO: SSR-H5 Protective Characteristics : Open Relay Action Principle : Electronic Type Size: Subminiature Type: Electric Parameter Relay Out put :24-600VAC Input: 3-32VDC Package Includes: 1 x Tense Solid State Relay SSR-H5 450DA