Thermal fuse, also called thermal fuse (national standard GB9816.1-2013), is a temperature-sensing loop cut-off device. Thermal fuses can sense the overheating generated during the abnormal operation of electrical and electronic products, thereby cutting off the circuit to avoid the occurrence...
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Limitor Thermal Fuse, also called thermal fuse (national standard GB9816.1-2013), is a temperature-sensing loop cut-off device. Limitor Thermal Fuse can sense the overheating generated during the abnormal operation of electrical and electronic products, thereby cutting off the circuit to avoid the occurrence of fire. Commonly used in: hair dryer, electric iron, rice cooker, electric stove, transformer, electric motor, water dispenser, coffee pot, etc. The thermal fuse cannot be used again after operation, and only operates once at the fusing temperature.
Limitor Thermal Fuses have a variety of construction methods. The following three are more common:
The first: organic type thermal fuse
The thermal fuse (5 sheets) consists of a movable contact (sliding contact), a spring (spring), and a fusible body (electrically nonconductive thermalpellet). Before the thermal fuse is activated, current flows from the left lead to the sliding contact, and through the metal case to the right lead. When the external temperature reaches a predetermined temperature, the organic matter can melt and the compression spring will become loose. That is, the spring expands, and the movable contact (slidingcontact) is separated from the left lead. The circuit is opened, and the current between the sliding contact and the left lead is cut off.
The second type: Porcelain tube type thermal fuse
It is composed of an axisymmetric lead, a fusible alloy that can be melted at a specified temperature, a special compound and a ceramic insulator to prevent it from melting and oxidizing. When the ambient temperature rises, the specific resin mixture begins to liquefy. When the melting point is reached, with the help of the resin mixture (increasing the surface tension of the molten alloy), the molten alloy rapidly shrinks around the leads at both ends under the action of surface tension. spherical, thus permanently severing the loop.
The third type: square shell type thermal fuse
A piece of fusible alloy wire is connected between the two pins of the thermal fuse. The fusible alloy wire is covered with special resin. The current can flow from one pin to the other pin. When the temperature around the thermal fuse rises to its operating temperature , its fusible alloy melts and shrinks into a spherical shape and attaches to the ends of the two pins under the action of surface tension and the help of special resin. In this way, the circuit is permanently cut off.
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