Thermal cutoff fuse

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Thermal cutoff fuse

A thermal cutoff is an electrical safety device either a thermal fuse or thermal switch that interrupts electric current when heated to a specific temperature. These devices may be for one-time use a thermal fuse , or may be reset manually or automatically a thermal switch. A thermal fuse is a cutoff which uses a one-time fusible link. Unlike a thermal switch which may automatically reset itself when the temperature drops, the thermal fuse is more like an electrical fuse : a single-use device that cannot be reset and must be replaced when it fails or is triggered. A thermal fuse is used when the overheating is a result of a rare occurrence, such as failure requiring repair which would also replace the fuse or replacement at the end of service life. One mechanism is a small meltable pellet that holds down a spring. When the pellet melts, the spring is released, separating the contacts and breaking the circuit. Another mechanism is more similar to an electrical fuse, a fusible element that melts when subjected to temperature above its threshold. The difference from the electrical fuse is in using the surrounding temperature, instead of the temperature generated by ohmic heating of the fusible element. The elements are conductive and usually consist of binary or ternary fusible alloy of tin , bismuth , antimony , indium , lead , and other metals.

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Most of us are familiar with the principle of fuses and how they work to help to keep electronics and other electrical systems operating smoothly. They protect overcurrents surging through a system and frying the other components or causing a fire. What is a thermal fuse and how does it work? According to SWE , a thermal fuse is a component that serves as a safety device. It is also known as a thermal cutoff. It opens circuits to prevent overheating.

Thermal cutoff fuse

A thermal cutoff is an electrical safety device either a thermal fuse or thermal switch that interrupts electric current when heated to a specific temperature. These devices may be for one-time use a thermal fuse , or may be reset manually or automatically a thermal switch. A thermal fuse is a cutoff which uses a one-time fusible link. Unlike a thermal switch which may automatically reset itself when the temperature drops, the thermal fuse is more like an electrical fuse : a single-use device that cannot be reset and must be replaced when it fails or is triggered. A thermal fuse is used when the overheating is a result of a rare occurrence, such as failure requiring repair which would also replace the fuse or replacement at the end of service life. One mechanism is a small meltable pellet that holds down a spring. When the pellet melts, the spring is released, separating the contacts and breaking the circuit. Another mechanism is more similar to an electrical fuse, a fusible element that melts when subjected to temperature above its threshold. The difference from the electrical fuse is in using the surrounding temperature, instead of the temperature generated by ohmic heating of the fusible element. The elements are conductive and usually consist of binary or ternary fusible alloy of tin , bismuth , antimony , indium , lead , and other metals.

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I would not recommend using a DC thermal fuse in place of one that is rated for AC. Any help would be very much appreciated, Thanks in advance, Paul Sojo. Typical use is for motor overheat protection. Product Examples. They function as safety devices to disconnect the current to the heating element in case of a malfunction such as a defective thermostat that would otherwise allow the temperature to rise to dangerous levels, possibly starting a fire. Another type of thermal switch is a PTC Positive Temperature Coefficient thermistor ; these thermistors have a "cutting off" temperature at which the resistance suddenly rises rapidly, limiting the current through the circuit. Hello, I was looking for a thermal fuse which would be used in a 24V DC application. A thermal cutoff is an electrical safety device either a thermal fuse or thermal switch that interrupts electric current when heated to a specific temperature. These devices may be for one-time use a thermal fuse , or may be reset manually or automatically a thermal switch. All Rights Reserved. Please help improve this article by adding citations to reliable sources.

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Similarly, the bimetal switch enhances the TCO solution by providing a higher operating current and precise control. A thermal fuse is used when the overheating is a result of a rare occurrence, such as failure requiring repair which would also replace the fuse or replacement at the end of service life. Unlike a thermal switch which may automatically reset itself when the temperature drops, the thermal fuse is more like an electrical fuse : a single-use device that cannot be reset and must be replaced when it fails or is triggered. Another mechanism is more similar to an electrical fuse, a fusible element that melts when subjected to temperature above its threshold. View our privacy notice and cookie notice to learn more about how we use cookies and how to manage your settings. Wikimedia Commons. Another type of thermal switch is a PTC Positive Temperature Coefficient thermistor ; these thermistors have a "cutting off" temperature at which the resistance suddenly rises rapidly, limiting the current through the circuit. Thermal Cutoffs Thermal Fuses are devices designed to keep components safe in situations when an excessive temperature occurs. Discover the optimal solution for your specific application. Current Rating Amps : Indicates the maximum current value at which a device is certified for operation. I was looking into models similar to this one: Digikey ref. Typical use is for motor overheat protection.