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An assortment of thermal fuses. 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 fuse is a common type of circuit breaker that involves direct effect of Joule-overheating. A fuse is always placed in series with the path of current it will affect. Fuses usually consist of a thin strand of wire of definite-material. When more that the rated current flows through the fuse, the wire melts and breaks the circuit.
A time-delay fuse (also known as an anti-surge or slow-blow fuse) is designed to allow a current which is above the rated value of the fuse to flow for a short period of time without the fuse blowing. These types of fuse are used on equipment such as motors, which can draw larger than normal currents for up to several seconds while coming up to ...
Not only do they protect the equipment from danger, but they also prevent dangerous fires caused by overheating of circuits. Once a cylinder fuse has been overheated and the wire has been melted, it no longer functions. After the cause of the excessive current has been remedied, a new fuse must be installed to restore the current through the ...
This cools the heat sink and whatever it is in direct thermal contact with. Use of fluids (for example coolants in refrigeration) and thermal interface material (in cooling electronic devices) ensures good transfer of thermal energy to the heat sink. Similarly, a fan may improve the transfer of thermal energy from the heat sink to the air.
The very large thermal loads imposed by abnormal landing and braking conditions (such as a high-speed rejected takeoff, where an aircraft heavy with fuel must brake hard from a very high speed to a stop in a relatively short distance) can cause the already high pressure in the tyres to rise to the point that the tyre might burst, so fusible ...
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