Siemens 3SB3400-0C Contact Block

The contact block, also known as a switch contact or auxiliary switch, from manufacturer Siemens with type number 3SB3400-0C is a mechanical attachment part for electrical switching devices. It has the dimensions 1 x 1 x 4 cm and weighs 0.1 kg. Contact blocks serve to expand control and signaling circuits by providing additional switching points for signal processing or for feedback on the operating status. Typical applications are found in control systems for machines and plants, such as in automation technology for status reporting of contactors or in control panels for actuating signal lights and control circuits.