The AQV258H5AX is a surface-mount, HE 1 Form A PhotoMOS relay designed for high-voltage switching. It is rated for a 1,500 V peak load voltage and a 20 mA continuous load current, with a peak load current capability of 0.06 A. This relay provides high electrical safety with an I/O isolation voltage of 5,000 Vrms and features a maximum on-resistance of 500 Ω. It is designed to operate reliably across an ambient temperature range of -40°C to +85°C. Common applications include industrial battery monitoring systems (BMS), isolation detection, voltage monitoring, and signal control.