Siemens 3SB3400-0B Contact Block

The contact block, also known as an auxiliary contact block, switch module, or control contact, from Siemens with type number 3SB3400-0B is a mechanical attachment block for extending the switching functions of control devices. It has the dimensions 1 x 1 x 4 cm and a weight of 0.01 kg. Contact blocks are used to add additional electrical contacts to control devices such as pushbuttons or switches to implement complex control tasks in machines and systems. Typical applications can be found in control panels, operator consoles, and machine controls in mechanical engineering and automation technology.