A solid-state relay ( SSR ) is an electronic switching device that switches on or off when an external voltage (AC or DC) is applied across its control terminals. It serves the same function as an electromechanical relay , but has no moving parts and therefore results in a longer operational lifetime. Specifications: Place of Origin: China Brand Name: Tense Model Number: DTY-220V60P1 Theory: Solid State Relay Usage: PROTECTIVE Size: Miniature Protect Feature: Sealed Contact Load: Low Power Rated Current: 6 0A Input signal: 0-5V,0-10V,4-20mA or potentiometer Load voltage: 220Vac Power supply: 220Vac Weight: 0.5kgs Package Includes: 1 x TENSE DTY Single-Phase Isolation Solid-State Voltage Regulator AC