Description
Description
The Smart 12V Thermistor Relay Switch – Automatic Temperature Protection is a rugged, industrial-grade temperature monitoring and control module designed for 12V DC systems. Operating on a standard 12V supply—common in automotive environments, solar installations, battery-powered equipment, PLC panels, and industrial control cabinets—this module combines a sensitive NTC thermistor temperature sensor with a built-in relay to automatically switch external devices based on ambient or surface temperature.
When the temperature rises above or falls below your preset threshold, the onboard comparator circuit (LM393) instantly energizes or de-energizes the relay, allowing you to control high-power devices such as cooling fans, exhaust vents, heaters, pumps, compressors, or alarm systems up to 10A. The module features an adjustable potentiometer for setting the temperature trip point, a green LED indicator showing relay status, and both Normally Open (NO) and Normally Closed (NC) output terminals for flexible fail-safe design.
Unlike the 5V version, this 12V module offers superior noise immunity, longer cable runs (up to 30 meters for the sensor), and direct compatibility with automotive and industrial control systems. The module operates standalone—simply apply 12V power, adjust the potentiometer to your desired trigger temperature, and connect your load. No microcontroller, no programming, and no software required. The onboard LM393 comparator provides stable, noise-immune performance with a built-in flyback diode to protect the circuit from relay coil spikes.
Whether you need to activate a radiator fan in a vehicle, turn on a heater in a chicken coop, protect a solar battery bank from overheating, automate greenhouse ventilation, or provide temperature backup protection for industrial equipment, the Smart 12V Thermistor Relay Switch delivers reliable, plug-and-play temperature protection in a compact, easy-to-use package.
Key Features
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12V DC Operation – Compatible with automotive, marine, solar, PLC, and industrial control systems.
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Standalone Operation – No microcontroller or programming required; works immediately after power-up.
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Adjustable Temperature Trip Point – Onboard potentiometer lets you set the exact temperature for relay activation.
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Dual Mode Operation – Use NO (Normally Open) for “turn on when hot” applications, or NC (Normally Closed) for “turn off when hot” or fail-safe applications.
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High-Power Relay – 10A/250V AC or 10A/30V DC contact rating controls fans, heaters, pumps, and more.
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Sensitive NTC Thermistor with Extended Cable – Fast response with included external probe; supports cable runs up to 30 meters.
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LM393 Comparator IC – Provides stable, noise-immune threshold detection ideal for industrial environments.
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Status Indicator LED – Green LED illuminates when relay is energized.
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Flyback Protection Diode – Protects circuitry from voltage spikes when relay de-energizes.
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Wide Operating Temperature – Module and sensor rated from -40°C to +100°C.
Technical Parameters
| Parameter | Value |
|---|---|
| Operating Voltage | 12V DC (±10%) (10.8V – 13.2V) |
| Operating Current | ≤ 60 mA (relay idle) / ≤ 100 mA (relay active) |
| Temperature Sensing Range | -40°C to +100°C (-40°F to +212°F) |
| Adjustable Trip Point Range | Approx. 0°C – 100°C (depending on environment) |
| Relay Contact Rating | 10A / 250V AC or 10A / 30V DC (resistive load) |
| Output Terminals | 3-pin screw terminal (COM, NO, NC) |
| Comparator IC | LM393 (dual voltage comparator) |
| Sensor Type | NTC Thermistor (10KΩ ±1% at 25°C) with 1m cable (extendable) |
| Operating Temperature | -40°C to +100°C (module and sensor) |
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