RDL ST-LCR3 Logic Controlled Relay Module, Dual Alternate Pulse, 3.3-24V DC Input

For installers and system integrators who need precise, repeatable momentary control, the Radio Design Labs ST-LCR3 relay module converts a single logic signal into dual alternate pulses — one when the signal turns on and another when it turns off. This Radio Design Labs relay is purpose-built for security and surveillance applications where timed actions (door strikes, camera presets, alarm triggers) must occur at both the start and end of an input event. The ST-LCR3 accepts a wide control range from 3.3 to 24V DC, supports active-high or active-low inputs, and offers both a relay contact and open-collector output for maximum interfacing flexibility. Rated to operate across typical indoor environments, it integrates cleanly with access control panels, monitoring systems, and custom automation controllers. Reduce wiring complexity and add reliable pulse logic to your installations with the ST-LCR3. Order a unit today to streamline relay control in your next security or monitoring project.

• Convert a single logic input into separate momentary start and end pulses to simplify control of doors, alarms, or automation
• Accepts 3.3–24V DC inputs so it integrates easily with modern low-voltage logic, microcontrollers, and access-control panels
• Provides both relay contact and open-collector outputs for flexible interfacing with security, surveillance, and monitoring equipment
• Supports active-high or active-low control, enabling direct connection to switches, pushbuttons, or TTL/CMOS logic without extra circuitry
• Compact, board-mounted module design makes it simple to add pulse control to existing relay banks or custom control panels