How to Set Up a Relay Timer Delay Module

By Kunkune | Published: 2026-10-23

Category: How-to Guides

Learn how to wire and adjust a 6-30V relay timer delay module for time-delay or cycle-timer applications. Step-by-step instructions with common mistakes to avoid.

Quick Answer

To set up a relay timer delay module, connect power and load per the module’s markings, then adjust the potentiometers or DIP switches to set your desired delay or cycle time.

Understanding the Module’s Controls

Most 6-30V relay timer modules have two or three adjustment trimmers: one for the time range (e.g., 0–10 seconds or 0–10 minutes), one for fine-tuning, and sometimes a mode selector for delay-on, delay-off, or cycle operation. The exact labeling varies, so check the silkscreen or included diagram.

The module you choose may lack a mode switch, meaning it only supports one timing function (e.g., delay-on). If your project needs both delay-on and delay-off, confirm the module’s capabilities before wiring.

Power Supply Considerations

The module accepts 6–30V DC, but the relay coil and control circuit draw current proportional to the voltage. At 12V, expect around 70–100 mA for the module alone, plus the load current through the relay contacts.

A common mistake is using an undersized power supply that cannot deliver the inrush current when the relay switches. Always use a supply rated at least 20% above the measured current.

Setup Steps

Identify the Input and Output Terminals: Locate the DC+ and DC- terminals for power input, and the COM (common), NO (normally open), and NC (normally closed) terminals for the relay output. Connect your power supply (6–30V DC) to DC+ and DC-. Check the polarity: reverse voltage can damage the module.
Connect the Load: Wire your load (e.g., a light, motor, or solenoid) between the COM terminal and either NO (load on when relay is energized) or NC (load on when relay is off). Use appropriately rated wire for your load current. Do not exceed the relay’s rated contact current (typically 10A at 30V DC / 250V AC).
Set the Time Adjustment Trimmers: Turn the time-range trimmer to select the maximum delay (e.g., 10 seconds or 10 minutes). Then adjust the fine-tuning trimmer to set the exact delay within that range. Use a small screwdriver and turn slowly. If the module has no markings, start with both trimmers at minimum and increase gradually while testing.
Select the Operating Mode (if available): If your module has a mode jumper or DIP switch, set it to delay-on (T-on), delay-off (T-off), or cycle mode. In cycle mode, the relay alternates between on and off based on the two time settings. In cycle mode, the on-time and off-time are usually set by separate trimmers; verify which trimmer controls which interval.
Power Up and Test: Apply power to the module. The relay should click after the set delay (or begin cycling). Use a multimeter to confirm voltage at the load terminals. Adjust trimmers as needed while the module is powered. Always test with a low-current load first (e.g., an LED with resistor) to avoid damaging equipment if wiring is wrong.

Product Facts

6-30V Relay Module Switch Trigger Time Delay Circuit Timer Cycle Adjustable: 6-30V Relay Module Switch Trigger Time Delay Circuit Timer Cycle Adjustable This module works with a wide voltage range and includes both time-delay and cycle-timer adjustments, making it suitable for automation, lighting control, and motor sequencing projects.
6-30V Relay Module Switch Trigger Time Delay Circuit Timer Cycle Adjustable