Thermal cutoff fuse

Bourns offers Design Kits that include several of these product lines.

We use cookies to provide our visitors with an optimal site experience. View our privacy notice and cookie notice to learn more about how we use cookies and how to manage your settings. By proceeding on our website you consent to the use of cookies. Thermal Cutoffs Thermal Fuses are devices designed to keep components safe in situations when an excessive temperature occurs. When the rated functioning temperature of the thermal cutoff is exceeded, the device will fail open in the electrical circuit, breaking the flow of current. Selection Characteristics.

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. Thermal fuses are usually found in heat-producing electrical appliances such as coffeemakers and hair dryers. 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. Unlike electrical fuses or circuit breakers , thermal fuses only react to excessive temperature and not to excessive current unless the excessive current is sufficient to cause the thermal fuse itself to heat up to the trigger temperature.

The elements are conductive and usually consist of binary or ternary fusible alloy of tinthermal cutoff fuse, bismuthantimonyindiumleadand other metals. Type the code from the image.

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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 fuses are designed to detect heat that arises from an overcurrent that occurs within an electrical system. The cause for the overcurrent could either be due to a breakdown in a component or a short circuit. Some of the functions of a thermal fuse are the same, e. When a thermal fuse is triggered it interrupts the current or stops it to stop the overheating of a circuit.

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.

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All Rights Reserved. This article needs additional citations for verification. 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 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. Any help would be very much appreciated, Thanks in advance, Paul Sojo. Thermal fuses are usually found in heat-producing electrical appliances such as coffeemakers and hair dryers. For protection from external heat, see thermal insulation. Available Lines. TCO devices have been proven to protect cables from damage from overheating by acting independently of any controller. 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.

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Unlike a thermal fuse, a thermal switch is usually reusable and is therefore suited to protecting against temporary situations which are common and user-correctable. 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. Do you have any other comments about how we can improve our website? The thermal switch may be a bimetallic strip , often encased in a tubular glass bulb to protect it from dust or short circuit. Download as PDF Printable version. Thermal fuses are usually found in heat-producing electrical appliances such as coffeemakers and hair dryers. Wikimedia Commons. Flashing incandescent Christmas lights take advantage of this effect. Bourns offers Design Kits that include several of these product lines. Tools Tools. When the pellet melts, the spring is released, separating the contacts and breaking the circuit. Another common design uses a bimetallic shallow dome-shaped cap which "clicks" to an inside-out inverted cap shape when heated, such as the "Klixon" brand of thermal cutouts. The elements are conductive and usually consist of binary or ternary fusible alloy of tin , bismuth , antimony , indium , lead , and other metals.