Auto-Fuse

The Auto-Fuse (自動切断 (オートヒューズ) ) is an unnamed mental protection spell used by various magicians, including members of the British Royal Family, the Knights of England and the Anglican Church.

Principles
The spell uses the symbol of a temporary funeral and creates a mental auto-fuse which automatically shuts down the user's mind when something tries to take control of it, allowing them to avoid being controlled but rendering them unconscious until the auto-fuse cuts out.

Kamijou Arc
In the incident at Windsor Castle during the celebratory party after Coronzon's defeat, when the other Touma caused Shokuhou Misaki to lose control of her power, most of the magicians present were able to avoid being directly controlled via the mental auto-fuses, with only 20% of the people present falling under the effects of Mental Out.