12V actuator delay, normallyopen relay module — repeatable trigger, adjustable timing Key benefits Provides a reliable timed delay for 12V DC systems, preventing immediate switching and reducing mechanical/electrical stress on downstream equipment. Flexible triggering: accepts either level or lowlevel actuator signals, making integration with a wide range of controllers and sensors simple. Builtin reversepolarity protection on the power supply terminal reduces risk from incorrect wiring. Repeatable triggering and an easytoadjust delay make it suitable for automation tasks that require repeated timed operations. What it does (function) Uses a normallyopen relay to switch loads after a userdefined delay. Delay time is adjustable from the default 0–25 seconds via an onboard potentiometer. If longer delays are required, timing can be extended by replacing the timing capacitor or using a largervalue potentiometer. The module can be retriggered repeatedly during operation, supporting cyclic or eventdriven control. Compatibility and performance Designed for 12V DC power systems. Trigger input is compatible with both active and activelow signals, enabling direct interfacing with a variety of sensors, PLCs, or microcontroller outputs. Electrical protection: antireverse diode on the power terminal protects against accidental reverse polarity connection. Practical applications Industrial control: delay sequencing for actuators, solenoids, and safety interlocks to prevent simultaneous starts. Motor and pump control: provide ramped or delayed starts to reduce inrush current and mechanical shock. Access control and automation: delayed release or timed locking for doors, gates, or conveyor diverters. Quick integration notes Supply with 12V DC and connect the trigger input according to required active level ( or low). Adjust delay with the onboard potentiometer; to exceed 25 seconds, the timing capacitor or use a larger potentiometer value. Observe correct polarity despite the antireverse diode—do not rely on protection as a substitute for correct wiring. Core specifications Operating voltage: 12V DC Relay contact type: Normally open (NO) Delay range: Default adjustable 0–25 seconds (extendable via capacitor/potentiometer) Trigger: level or lowlevel compatible Protection: Power terminal antireverse diode This module is practical for engineers and technicians seeking a compact, repeatable delay relay solution that integrates into existing 12V control systems without complex configuration.