Specifications: The APY412GS is a Normally Closed (SPST-NC) PhotoMOS SSR in an SOP-4 package, rated for 500mA and 60V (AC/DC). It features a 0.8Ω on-state resistance and 2500Vrms isolation. Controlled by 1.2-1.4VDC, it has asymmetrical switching times of 500μs to open (turn-on) and 250μs to close (turn-off). Its operating temperature range is -40°C to 85°C.

Application Scenarios: Engineered for fail-safe medium-current control. Typical applications include safety shutdown circuits in power supplies, battery backup system disconnects that default to connected, industrial process controls requiring a normally energized state, and alarm system outputs where the alarm condition is represented by an open circuit.