The KT12-1A-40L-SMD is a high-voltage reed relay in a compact, surface-mount package, designed for applications requiring high isolation. It features a 1 Form A rhodium contact, a nominal coil voltage of 12 VDC, and can switch up to 1000 V or 1.0 A with a maximum power rating of 100 W. Key characteristics include a maximum contact resistance of 150 mOhm, a typical coil resistance of 475 Ohm, and a wide operating temperature range of -40°C to 100°C. Tested in accordance with AEC-Q200, this relay is well-suited for demanding applications such as automotive battery management systems, photovoltaic inverters, and isolation measurement equipment.