Specifications: The APY414EH is a high-isolation, Normally Closed relay for medium-voltage circuits, presented in a miniature SMD-4 package. It manages 120mA at 400V (AC/DC) with a 20Ω conduction impedance. Its standout safety feature is 5000Vrms of input-to-output isolation. The relay exhibits a very fast 20μs opening time and a slower 500μs closing time. Built for reliability in demanding conditions, it operates from -40°C to 85°C and is controlled by a 1.2-1.4VDC input.

Application Scenarios: This device is engineered for fail-safe operation in high-voltage environments. It is critically employed in medical equipment where a sensor or probe must be normally powered for monitoring but requires instant disconnection for patient safety. It's also used in high-voltage power supply crowbar protection circuits that need to rapidly short the output in case of overvoltage, and in industrial interlock systems where a fast break is essential.