The HK1605 time relay is a fully assembled electronic module (without enclosure) designed to control electrical loads using a positive +12 V trigger pulse. It operates as a pulse-activated timer with an adjustable ON time.
When power is applied, the module remains in standby mode waiting for a trigger pulse. Upon receiving a positive +12 V pulse, the relay switches ON and remains active for the preset time. After the time expires, the relay switches OFF and returns to standby mode, waiting for a new trigger pulse.
If the trigger pulse duration is longer than the preset time, the relay switches OFF after the time expires and can be activated again only by a new trigger pulse.
The ON time is smoothly adjustable from 1 to 30 units using a trimmer potentiometer. The time unit (seconds, minutes or hours) is selected via jumpers with the power OFF.
The module features LED indicators for power supply and relay status. It is intended for integration into an enclosure or control panel.

Technical Specifications:
Operating principle: positive pulse activated time relay (+12 V).
ON time: 1 - 30 seconds, minutes or hours.
Time range selection:
- W1 closed, W2 closed - seconds,
- W1 closed, W2 open - minutes,
- W1 open, W2 closed - hours.
Time adjustment: trimmer potentiometer.
Indication:
- power LED,
- relay ON LED.
Dimensions:
- PCB: 49 x 29 mm.
Relay output:
- Normally Open contact (NO),
- Common contact (COM),
- Normally Closed contact (NC).
Relay ratings:
- 15 A / 125 V DC,
- 15 A / 24 V DC or AC,
- 10 A / 250 V AC.
Supply voltage: 10 - 14 V DC.
Current consumption:
- relay OFF: 8 mA,
- relay ON: 48 mA.

This product is a fully assembled module.
It is also available as a boxed finished product - Product code 1655 (separate product).