The AQY412EHA is a normally closed PhotoMOS relay featuring reinforced insulation rated at 5,000 V AC with a Form B output configuration. It utilizes Panasonic's proprietary DSD (Double-diffused and Selective Doping) MOSFET technology to achieve a typical on-resistance of 1 O and can control a maximum continuous load current of 0.55 A at 60 V with only 5 mA input current. The device maintains extremely low closed-circuit offset voltage, enabling precise control of low-level analog signals without distortion, and features low off-state leakage current of 10 µA maximum. With an operating temperature range of -40°C to +85°C and internal insulation distance exceeding 0.4 mm, this relay is ideal for power supplies, measuring equipment, security systems, modems, and telecommunications applications requiring galvanic isolation and reliable switching performance.