The device has two connection terminals (38, 48) connecting the device to an electrical installation. An overvoltage protection component i.e. varistor (30), is electrically connected to the terminals. A thermal disconnector includes a conductor blade maintained in a position in which the blade assures electric connection between the component and one of the terminals. The disconnector moves the blade in another position when temperature of the component exceeds a present threshold value in which the electric connection is open in the latter position. The blade and the terminal are formed as a single part.
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