The stirrer shall incorporate a biased-off switch that is recessed or guarded to prevent accidental operation. It conforms to the IEC60335-2-14 requirement. Appliance is checked by applying a cylindrical rod whose diameter is 40mm and which has a hemispherical end to touch the switch with a force not exceed 5N. The appliance shall not operated.

Standard :
IEC60335-2-14 “Household and similar electrical appliances – Safety – Part 2-14: Particular requirements for kitchen machines”