What is a PTC thermistor?

A PTC thermistor (Positive Temperature Coefficient Thermistor) is a component that increases its resistance as temperature rises. It is commonly used in overcurrent protection, temperature control, and temperature measurement applications. As the temperature increases, its resistance increases sharply, which limits the current flow in a circuit when the temperature exceeds a certain level. This helps to prevent overheating or overcurrent. PTC thermistors are widely used as safety devices that react to temperature changes, especially in protective circuits for electronic devices. They are small, durable, and cost-effective, making them suitable for a wide range of products.

Application of PTC thermistor

✅ Overcurrent Protection Circuit
PTC thermistors are used in overcurrent protection circuits. When excessive current flows through the circuit, the temperature increases, causing the resistance to rise. This limits the current flow, preventing damage from overcurrent.
✅ Power Supply Units
PTC thermistors are used in power supply units to protect against overheating. When abnormal temperature rises are detected, the thermistor increases its resistance, protecting the power supply from excessive heat, which helps prolong the device's lifespan.
✅ Motor Protection Circuits
In circuits for motors or fans, PTC thermistors are used to prevent overheating. When the temperature reaches a certain level, the thermistor limits the current flow, protecting the motor from damage.
✅ Temperature Control in Household Appliances
PTC thermistors are used in household appliances for temperature control. For example, in electric kettles or heaters, the thermistor works to prevent the temperature from rising too much, ensuring protection against overheating.

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