Siemens 3SB3500-4LR11 Key-Operated Switch

Siemens 3SB3500-4LR11 is a 22 mm round, panel-mount key-operated selector switch that provides a two-position Off-On control in a maintained (latching) configuration. It includes two keys, with key removal possible in either position (O+I), and uses a CES-style lock (lock no. STGH10) with a holder included for mounting convenience. The actuator is a round keyswitch with a 50-degree operating angle, designed for secure state selection in control panels across industrial equipment. This part is sold under the 3SB3500-4LR11 designation by Siemens and is listed by multiple distributors as a two-position, key-operated switch with two keys and a holder.