W1209 12V -50°C to 110°C Digital Thermostat Temperature Control Switch Sensor Module

The W1209 Temperature Controller is a compact, cost-effective, and versatile thermostat module designed for precise temperature-based control of electrical devices. Equipped with a high-accuracy NTC thermistor temperature sensor, the W1209 allows users to automate the operation of cooling or heating systems based on real-time temperature readings. This module features a built-in relay (rated for up to 125V AC or 14V DC at 20A) that can switch power to connected devices such as fans, heaters, or coolers. The user sets the desired temperature thresholds - both activation (on) and deactivation (off) points - via the onboard interface, which includes a 3-digit digital display and three tactile buttons: Set, Increase, and Decrease. When the sensed temperature crosses the defined threshold, the W1209 activates or deactivates the relay accordingly, effectively functioning as an automatic power switch. The current temperature is continuously displayed in degrees Celsius, and an onboard LED ind