Fuses and electrical protection symbols.
Thermal cut out symbol.
Thermal protectors can also be built into the windings see the illustration below.
In single phase motors up to a given motor size around 1 1 kw it can be mounted directly in the main circuit to serve as an on winding protector.
They operate as a sensitive power cut out for both single and three phase motors.
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Thermal fuse 10a 250v 228c 442f 480.
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Fuses are devices containing a small piece of special wire that melts when the intensity of the current flowing through it for a certain period of time exceeds a set value thus protecting the rest of the electrical circuit overloads.
The term thermal cutoff switch generally refers to how the switch is used ie.
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.
It cuts off the current to critical machinery when a temperature limit is exceeded preventing potential burn out or failure.
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