To provide a tap changer facilitating access to a measuring point for measuring a contact sequence in the tap changer.

The tap changer 4 includes a cylinder 1 and a shaft 2 that is rotatably arranged inside the cylinder; the cylinder 1 is provided with fixed contacts; the shaft 2 is provided with a contact circuit extending toward the cylinder 1 and including mechanical contacts; the mechanical contacts are structured to selectively mate with the fixed contacts of the cylinder 1 upon rotation of the shaft 2; the contact circuit also includes at least two measuring points for measuring the function of the contact circuit. The tap changer 4 includes at least one measuring contact device 140-142, which is electrically connected to the respective measuring points in the contact circuit, and the measuring contact device 140-142 is arranged inside the shaft 2. This facilitates access to the measuring points of the tap changer 4.

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