Specifications: The APY412E is a Normally Closed (NC) configuration relay in a through-hole DIP-4 package, designed for fail-safe circuit design. It is rated to carry 500mA at 60V (AC/DC) in its default state, with a 1Ω on-resistance. A high 5000Vrms isolation rating ensures safety between control and load circuits. Upon activation, it opens the circuit in 500μs and re-closes it in 250μs. Engineered for reliability, it operates from -40°C to 85°C with a control input range of 1.2-1.5VDC.

Application Scenarios: This relay is fundamental for implementing safety and redundancy schemes. It is extensively used in uninterruptible power supply (UPS) systems to maintain a default bypass path, in industrial machinery for emergency stop circuits that must be normally closed, in alarm systems where the alarm condition is triggered by opening a loop, and in power sequencing circuits to ensure a default voltage rail is present unless explicitly disabled by the control logic.