Specifications: The APV251G4E is the through-hole DIP-6 version of an ultra-high-current PhotoMOS SSR. It is a 1 Form A (SPST-NO) relay capable of handling 4.5A at 40V AC/DC. Its defining characteristic is an exceptionally low 33mΩ on-state resistance. It provides 5000Vrms isolation and has a turn-off time of 50μs. (Note: Turn-on time is not specified in the provided data). It operates from -40°C to 85℃ with a 1.3-1.5VDC input. Application Scenarios: Designed for the highest current density switching in a through-hole package. Ideal for driving very high-current loads in industrial automation panels, power tool controls, electric vehicle auxiliary systems, server power distribution, and welding equipment control, where the ultra-low Rds(on) ensures cool operation and the DIP package facilitates heat sinking and robust connections.