Fuses and electrical protection symbols.
Thermal cut out symbol.
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.
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The term thermal cutoff switch generally refers to how the switch is used ie.
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Thermal fuse 10a 250v 228c 442f 480.
Thermal protectors can also be built into the windings see the illustration below.
They operate as a sensitive power cut out for both single and three phase motors.
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.
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.