The HK1604 time relay is a fully assembled electronic module (without enclosure) designed to control electrical loads with an adjustable operating time. The device operates in Delay OFF mode.
When power is applied, the relay switches ON immediately and the preset time starts counting. After the time expires, the relay switches OFF and remains OFF until the power supply is removed. Each power-up restarts the timing cycle.
The operating time is smoothly adjustable from 1 to 30 units using a trimmer potentiometer. The time unit (seconds, minutes or hours) is selected via jumpers and must be set while the power is 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: Delay OFF time relay.
Operating 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 1654 (separate product).