The 3SB3403-1PD part is a switch selector from Siemens designed for use in manual control. It is a key-operated selector switch with a maximum of three poles, four positions and a removable key. This switch is intended for use in applications with power ratings of up to 10A, 400VAC and 10A, 250VDC. The switch can be fitted with up to 2x additional pole and up to 4x additional positions for non-standard applications. It has a robust design and construction, with 1PVC insulation and a high contact quality, making it suitable for a wide range of control and load switching applications. The switch is also rated for operation in high vibration and corrosive environments, making it suitable for challenging industrial environments.