Solid state relay (SSR), short for a relay state solid, provides versatile non-mechanical switching using semiconductors, achieving unparalleled reliability for high-cycle applications. Range of exposed shock, vibration and corrosion makes this device appropriate for aerospace, marine, and industrial environments. Base variants of SRR support current ratings from milliamp to kiloamp and triac based AC/DC while MOSFET based DC only, adding advanced models featuring LED status indicators for predictive maintenance in smart factory systems.