The RNSbot W1209 DC12V Thermostat Module is a compact yet powerful digital temperature controller designed for precise monitoring and control of heating and cooling applications. Built with a high-precision NTC temperature sensor and a reliable microcontroller, this module offers stable performance, easy configuration, and versatile use in both industrial and DIY projects.

With its user-friendly LED digital display, three-button interface, and programmable temperature range, the W1209 allows users to set target temperatures, control thresholds, and operational modes with high accuracy. Whether you need to manage a DC-powered cooling fan, heater, incubator, aquarium, or laboratory equipment, this miniature temperature control switch board delivers exceptional reliability at an affordable price.

Key Features

• Wide Control Range: Supports temperature control from -50°C to +110°C, ideal for multiple environments.

• High Precision Sensor: Equipped with an NTC 10K thermistor probe for accurate and stable temperature measurement.

• Versatile Power Input: Operates on DC 12V, compatible with a wide range of low-voltage power systems.

• Compact Design: Small form factor, perfect for integration into equipment and DIY projects.

• LED Display: Clear three-digit display for real-time temperature monitoring.

• Programmable Settings: Adjustable temperature setpoint, hysteresis (differential), and working mode (heating or cooling).

• Relay Output: Supports up to 20A relay output, allowing direct control of fans, heaters, motors, and pumps.

• Easy Operation: Three tactile push buttons make it simple to configure parameters.

• Durable Construction: Built with high-quality components for long-lasting performance.

• Applications: Suitable for aquariums, incubators, PC cooling systems, industrial machines, and climate-controlled storage.

Technical Specifications

• Brand/Model: RNSbot W1209

• Operating Voltage: DC 12V

• Temperature Control Range: -50°C to +110°C

• Measurement Accuracy: ±0.1°C (display precision)

• Control Accuracy: ±0.1°C to ±1°C (adjustable)

• Sensor Type: NTC 10K waterproof thermistor probe

• Sensor Cable Length: Approx. 50 cm

• Relay Output: 20A, 125VAC / 20A, 14VDC

• Display Type: 3-digit red LED

• User Interface: Three push-button controls

• Working Modes: Heating mode / Cooling mode

• Hysteresis Setting: Adjustable

• Refresh Rate: 0.5 seconds

• Power Consumption: ≤ 50mA

• Board Size: Approx. 48mm × 40mm × 14mm

• Mounting: Standard PCB mounting holes for easy installation

• Operating Temperature: -10°C to +60°C

• Storage Temperature: -20°C to +85°C

Applications

The RNSbot W1209 Thermostat Module can be integrated into a wide variety of temperature-sensitive systems:

• Aquariums – Maintain water temperature for fish and aquatic life.

• Incubators – Ensure stable heating conditions for egg incubation.

• Greenhouses – Control fans and heaters for optimized plant growth.

• Refrigeration Systems – Protect against overcooling or overheating.

• PC Cooling – Automate cooling fans for temperature-regulated computer builds.

• Laboratory Equipment – Maintain consistent conditions for testing and experiments.

• Home Appliances – Modify or repair refrigerators, heaters, or other electronics.

• DIY Projects – Widely used by electronics enthusiasts for custom automation solutions.

Unlike conventional thermostats, the RNSbot W1209 offers flexibility, compact size, and precise digital control. It is ideal for both professionals who require dependable thermal management in their equipment and hobbyists building custom projects. Its affordable cost, high-current relay output, and user-friendly interface make it one of the most popular and reliable temperature controllers on the market.

By using the W1209, you not only extend the life of your electronic systems but also improve efficiency by maintaining stable temperature conditions. The combination of programmable logic, high precision, and strong relay control ensures it can handle both small and medium-scale applications.