wherein the key cannot be removed until the switch is returned to its original position

Introduced: September 1968

Last revised: January 2006

Full Title

Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings > Key inserted and then turned to effect operation of the switch > wherein the key cannot be removed until the switch is returned to its original position

Classification Context

Section:: ELECTRICITY
Class:: ELECTRIC ELEMENTS
Subclass:: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES