IEC 60335-2-30取暖器标准
22.109 The disconnection of the supply by a switch in the off position shall not rely on
electronic components.
IEC 60335-1中对off position的定义:
off position
stable position of a switching device in which the circuit controlled by the switch is
disconnected from its supply or, for electronic disconnection, the circuit is de-energized
NOTE The off position does not imply an all-pole disconnection.