The HK1661 reset time relay is a ready-to-use enclosed device designed for cyclic control of electrical loads with long ON periods and short OFF intervals. The device operates as a timer that periodically switches the load OFF for a fixed reset time.
When power is applied, the relay switches ON and starts counting the preset ON time. After the ON time expires, the relay switches OFF for a fixed period of 1 or 5 minutes, selectable via jumper W2. Once the OFF time expires, the relay switches ON again and the cycle repeats continuously until power is removed.
The ON time is adjustable from 1 to 24 hours using a trimmer potentiometer. For easier setup, jumper W1 allows initial adjustment in seconds before switching to hours. All jumper settings must be changed with power OFF.
LED indicators show power status and relay activity.

Technical Specifications:
Operating principle: cyclic reset time relay with periodic OFF interval.
ON time: 1 - 24 hours.
OFF (reset) time:
- 1 minute - jumper W2 closed,
- 5 minutes - jumper W2 open.
Time adjustment: trimmer potentiometer.
Time scale selection (jumper W1):
- W1 closed - seconds (setup mode),
- W1 open - hours.
Indication:
- power LED,
- relay ON LED.
Dimensions:
- PCB: 49 x 29 mm,
- Enclosure: 55 x 35 x 20 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 boxed finished product.
It is also available as a fully assembled module (without box) - Product code 1611 (separate product).