Siemens 3SB3500-4AD01 is a 22 mm round, key-operated selector switch with a Ronis lock and two keys, designed for non-illuminated panel mounting. It offers two maintained positions (O and I) with a 50-degree clockwise actuation; the activation element is a silver metal head with a 28.5 mm outer diameter, mounted behind a metal front ring. The lock is SB30 and removal is possible with the holder; optional locks SB31, SB455, or SB421 are available for specialty applications. This compact selector switch is used for mode or function selection in control circuits and machinery where a keyed two-position switch is required.
