Time Delay Relay Module (No Display) – Switch Trigger Timer Relay
This time delay relay module is designed for automation tasks where a delay is needed before switching ON or OFF an electrical load. It operates without a display screen and offers simple yet powerful timing control after receiving a trigger signal. Ideal for DIY electronics, automation, lighting control, fans, and more.
🔧 Key Features
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Working Voltage: 5V / 12V / 24V DC (based on version)
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Trigger Mode: Low-level (GND) signal to IN pin
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Timing Range: Adjustable (usually 0.1 – 10 seconds, or up to several minutes depending on potentiometer or capacitor settings)
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Relay Output: SPDT mechanical relay (NO/NC/COM terminals)
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Current Capacity: 10A @ 250V AC / 10A @ 30V DC
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Timing Mode:
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Trigger Delay ON (once triggered, relay turns ON after delay)
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Trigger Delay OFF (some versions support delay after turning OFF)
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📐 Specifications
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Control Input: 1× trigger pin (IN)
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Relay Type: Electromechanical 1-channel
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Board Size: ~50mm × 26mm × 18mm
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Timing Adjust: Onboard potentiometer or adjustable resistor
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Indicator LEDs: Power & relay status (on some versions)
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Isolation: Optocoupler protection in many models for safer triggering
🛠️ How It Works
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Power the module (connect +V and GND)
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Send a trigger (usually by pulling IN pin to GND)
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The relay will activate after the delay time set by the onboard potentiometer
🧰 Applications
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Delay start circuits (e.g. fans, lights)
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Auto shut-off after preset time
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DIY timing and automation systems
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Battery-powered or solar electronics
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Motor control with delay for safety
✅ Advantages
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No display – simple and reliable operation
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Precise timing with adjustable potentiometer
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Suitable for microcontrollers and discrete electronics
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Works in both home and industrial applications
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Small footprint – fits into enclosures and project boxes
⚠️ Note: Relay contact is mechanical; avoid switching high-frequency signals or inductive loads without snubber circuit.