Specifications: The APY414S offers a Normally Closed configuration tailored for medium-voltage, low-current applications, housed in a standard SOP-4 package. It carries a 120mA, 400V (AC/DC) rating with a 20Ω on-state resistance and 2500Vrms isolation. Its switching behavior is defined by a 500μs response to open and a 20μs response to close. Designed for enduring operation, it performs from -40°C to 85°C with a 1.2-1.4VDC control voltage.

Application Scenarios: This relay is versatile for control schemes requiring a default-on state. It finds use in keeping pilot lights or standby indicators energized, maintaining a calibration loop closed in instrumentation unless overridden, and serving as a safety shunt in current measurement circuits that must be normally shorted to protect a sensitive ammeter, providing a reliable and isolated switching function.