Thermosensitive Reed Relays are widely used electronic components for temperature control and overheat protection. With the rapid development of industries such as smart homes, industrial automation, and automotive electronics, the demand for thermosensitive reed relays continues to rise. Thanks to their precise temperature control, low power consumption, long lifespan, and other advantages, they have become an essential component in many electronic devices. This article will provide an in-depth look at the working principle, characteristics, advantages, and applications of thermosensitive reed relays.
I. What Are Thermosensitive Reed Relays?
A thermosensitive reed relay is an electrical component that uses temperature changes to control the switching of a circuit. It consists of a thermosensitive element and a reed switch. When the ambient temperature reaches a specific threshold, the physical properties of the thermosensitive element change, causing the reed switch to move and trigger the relay's switching action. Common thermosensitive elements include thermistors (NTC/PTC) and thermosensitive transistors, which change resistance or other physical properties as temperature increases, enabling temperature control functions.
II. Working Principle
The working principle of thermosensitive reed relays is based on temperature changes. The core of the relay is a switching mechanism made up of two metal reed contacts, usually sealed within a glass tube or another protective casing. As the temperature rises, the resistance of the thermosensitive element (such as a thermistor) changes, which causes the reed switch to bend. Specifically, when the temperature exceeds a set threshold, the change in resistance of the thermosensitive element causes the reed switch to bend, thereby triggering the relay to either open or close the circuit.
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