12/24V Adjustable Timer Relay - Delay ON / Delay OFF

ATR1224 - Universal multi-timer relay 12/24V Adjustable Timer Relay - Delay ON / Delay OFF - 30A at 12V One compact adjustable timer relay for 12V and 24V DC systems. Set Delay ON or Delay OFF from 0.5 seconds to 6 hours. Rated up to 30A at 12V and 15A at 24V. How to set a 10-minute Delay OFF Example: keep an engine cooling fan running for 10 minutes after ignition is switched off. Simple set-up 1. Set A to position 2. This selects Delay OFF with a 0.5-10 minute range. 2. Turn B fully clockwise. This sets the delay to approximately 10 minutes. 3. Wire the fan to terminal 87. Connect terminal 30 to a permanent fused positive supply, 85 to ground and 86 to the ignition-switched positive signal. When ignition is switched off, the fan stays powered for the selected 10 minutes, then turns off automatically. Terminal 87a is unused in this application. Set, test, fine-tune: choose the range with A, set B, test one full cycle, then make a small adjustment if needed. What is it? BAYWATT ATR1224 is a 12/24V adjustable timer relay in a compact 5-pin SPDT automotive relay format. It combines a high-current changeover relay with an adjustable electronic timer, so you can customize how long a circuit waits before switching on or how long it remains powered after its trigger is removed. This is one bi-voltage 12/24V timer relay, not separate 12V and 24V references. Its switching capacity is clearly rated at 30A at 12V or 15A at 24V. 12/24V DCOne timer relay for either DC system. 30A at 12V15A at 24V switching capacity. Delay ON / OFFAdjustable from 0.5 sec to 6 hrs. How does the adjustable timer work? Delay OFF: power stays ON after trigger OFF When terminal 86 receives a positive trigger, terminal 87 powers the load immediately. When the trigger disappears, the selected timer begins. Terminal 87 stays powered, then switches off at the end of the delay. Trigger ON - 87 ON - trigger OFF - selected delay - 87 OFF Delay ON: wait before power turns ON When terminal 86 receives a positive trigger, the timer starts. Terminal 87 remains off during the selected delay, then powers the load when the timer ends. Trigger ON - selected delay - 87 ON Use terminal 87a intelligently: in a Delay ON application, 87a can power a red WAIT light while the timer is counting. When the timer ends, 87a switches off and 87 can power a green READY light and the instrument. A. Time Range / B. Time Adjust A selects the mode and broad time range. B adjusts the exact time within that range. Turn B counter-clockwise for the shortest delay and clockwise for the longest delay. Delay mode A. Time range B. Time adjust Delay OFF Output switches OFF after the trigger is removed 0 0.5 - 10 seconds 1 5 - 60 seconds 2 0.5 - 10 minutes 3 5 - 60 minutes 4 0.5 - 6 hours Delay ON Output switches ON after the trigger is applied 5 0.5 - 6 hours 6 5 - 60 minutes 7 0.5 - 10 minutes 8 5 - 60 seconds 9 0.5 - 10 seconds 5-pin timer relay wiring diagram Use conventional automotive relay terminals. Terminal 30 is the permanent fused positive supply, 85 is ground, 86 is the positive trigger, 87 is the normally open timed output, and 87a is the normally closed alternate output. 30Permanent fused +12/24V supply 85Negative / ground 86Positive trigger signal 87Normally Open timed output 87aNormally Closed alternate output Use a fuse matched to the cable and load. Terminal 30 must remain powered during a Delay OFF cycle. Applications Customize your own timer instead of using a fixed-delay relay. The ATR1224 suits boats, vans, RVs, 4x4s, trucks, agricultural machines and auxiliary DC equipment. Engine cooling fans and ventilation blowers Delayed instrument or accessory activation after ignition Cabin, cockpit, deck and courtesy lights Fresh-water, circulation and washdown pumps Solenoid valves, compressors and auxiliary motors Sequential start-up to reduce peak current draw Control signal for a separate high-current relay or contactor Mini screwdriver included: adjust gently A mini flat screwdriver is included to reach the recessed A and B adjustments. Use the supplied screwdriver or a very thin flat blade. Do not push hard on the potentiometer; turn it with light pressure only. Do not use a large screwdriver or a wide blade. When B reaches the end of its travel, stop. Never force it. Set A first, then set B and test the timer before final installation. Electrical safety: fuse terminal 30 correctly, disconnect power before changing wiring, and never connect terminals 87 and 87a together. Questions & answers Does this relay work on 12V and 24V? Yes. This is one universal 12/24V DC timer relay. Its rating is 30A at 12V and 15A at 24V. What is the difference between Delay ON and Delay OFF? Delay ON waits before powering terminal 87. Delay OFF powers terminal 87 immediately, then keeps it powered for the selected time after the trigger at terminal 86 disappears. Can I set a 10-minute delay? Yes. For a 10-minute Delay OFF, set A to position 2 and turn B fully clockwise. What can I use terminal 87a for? 87a is the normally closed output. In Delay ON mode, it can power a red WAIT light until terminal 87 switches on to power a green READY light and the instrument. Can I connect a load above the relay rating? Not directly. Use terminal 87 to control the coil of a correctly rated high-current relay, contactor or solenoid. Why must terminal 30 be fused? Terminal 30 is the main positive supply. Fuse it according to the cable size and load. It must stay powered while a Delay OFF timer is running. Technical specifications The essential technical data for the ATR1224 12/24V adjustable timer relay. Voltage: 12/24V DC Switching capacity: 30A at 12V / 15A at 24V Functions: Delay ON / Delay OFF Timing range: 0.5 second to 6 hours Contact type: 5-pin SPDT changeover Terminals: 30 / 85 / 86 / 87 / 87a Format: Compact Mini ISO-style relay Included: Mini flat adjustment screwdriver