EN60335-Household and similar electrical appliances Safety —Part 1: General requirements

electronic component
part in which conduction is achieved principally by electrons moving through a vacuum, gas or semiconductor
NOTE Neon indicators are not considered to be electronic components.

electronic circuit
circuit incorporating at least one electronic component

protective electronic circuit
electronic circuit that prevents a hazardous situation under abnormal operating conditions
NOTE Parts of the circuit may also be used for functional purposes."

software class B
software that includes code intended to prevent hazards if a fault, other than a software fault,occurs in the appliance

software class C
software that includes code intended to prevent hazards without the use of other protective devices