Key switch, 16 mm, round, plastic, Siemens, C, 2 switching positions O-I, latching, switching angle 62 degrees, key withdrawal O+I. SIRIUS 3SB2 key switch for higher access security requirements. The 3SB2 push buttons and indicator lights are modular, field-tested, and suitable for industrial use. Due to their compact design, they are particularly suitable for small control panels. They are highly functional, extremely robust, and comply with the standards IEC/EN 60947-5-1 and 60947-5-5. They can be installed without special tools and in a high packing density. Available versions: 2/3 switching positions, latching/pressing operation, various key withdrawal positions. Note: Complete unit, delivery includes holder and switching element(s). 3SB2 - space-saving, field-tested, and suitable for industrial use!.