Siemens 3SB3500-4DD11 Push Button Switch 30mm

Siemens 3SB3500-4DD11 is a 22 mm diameter, metal rotary key switch head from the Sirius 3SB3 family designed for panel mounting. This 3-position, maintained selector provides three stable positions: I, O, II, with a removable key to lock the chosen position and prevent unauthorized changes in operation. The 4DD11 variant specifies the exact keying/encoding configuration for this head, and the assembly is compatible with Ronis‑style locks that use two keys in many configurations. It carries an IP65 rating, offering protection against dust and water jets in demanding industrial environments. This head is typically paired with a matching 3SB3 switch body to form a complete panel-mounted switch used in applications such as control-panel mode selection, safety interlocks, and process-control enablement on equipment like conveyors, presses, and packaging lines. Because this is a head component, ensure your enclosure supports a 22 mm switch head and that the 4DD11 keying aligns with your security and maintenance requirements before purchasing.