Lever Switch (Hook Switch)
Lever switch, The lever switch has two contacts which are
operated by a hinged lever and plunger. The switch is held depressed
by the weight of the handset which is hung on it. and is automatically
raised by a spring when the handset is removed. The contacts are open
when the lever switch is depressed and closed when the switch is released.
The lever switch is used only on common battery circuits.