The GEYA GRT8-S1 is an asymmetric cycle timer relay, a device used to automatically turn electrical loads on and off in a repeating cycle with independently adjustable ON and OFF times. It's commonly used in applications like room ventilation, cyclic dehumidification, and controlling pumps or lights -1-2.
Here is a summary of its key specifications:
| Feature | Specification |
|---|---|
| Key Functions | Cyclic timing with two start modes: beginning with a pulse or a pause -1-5. |
| Output Contacts | 1 SPDT (Single Pole Double Throw) relay -1. |
| Contact Rating | 16A at 250V AC -1-3. |
| Supply Voltage | Wide range: 12-240V AC/DC -1-2. |
| Time Adjustment | Via two potentiometers (for time range and delay) -5. |
| Time Range | 0.1 seconds up to 100 days (divided into 10 sub-ranges) -1-2. |
| Mounting | 35mm DIN rail (compact, 18mm wide) -1-2. |
| Indicators | Green LED (power), red LED (output status) -1-3. |
| Operating Temp. | -20°C to +55°C -1-3. |
???? How It Works and Setup Tips
Core Function: It creates a continuous, repeating loop. You set one time for the output to be ON and a separate time for it to be OFF. The "asymmetric" name comes from the fact that these two times can be different -1-5.
Basic Wiring: The unit has terminals for power (A1, A2), a "function select" jumper (S, A1), and the relay output contacts (11, 12, 14) to connect your load -1-3.
Selecting Mode: A jumper between terminals S and A1 determines the start mode: "Cycler beginning with pulse" or "Cycler beginning with pause" -1-2.
Setting Time: Use the two adjustment dials.
First, use the range selector dial to choose one of the 10 time scales (e.g., 1 min – 10 min).
Then, use the delay adjuster potentiometer to fine-tune the timing within that selected range -5.
???? Where to Buy and Pricing
You can find this timer on major marketplaces. Please note that prices and availability fluctuate frequently, and the figures below are based on recent listings.
Amazon: Available for around SGD 34.33, plus shipping -2.
eBay: Listings have shown prices between USD 15.00 to USD 44.33, with significant shipping costs from international sellers -6-7.
Specialist Retailers: Stores like VB Industrial Supply also carry it -9 .https://store.unigulfsupply.com/product/asymmetric-cycler-time-relay-grt8-s1-geya/