ABB 1SFN010720R3311 Auxiliary Contact Block

The auxiliary contact block, also known as auxiliary contact unit or additional contact switch, from ABB with type number 1SFN010720R3311 is an electrical component for extending the functionality of contactors. It has the dimensions 7 x 3 x 7 cm and weighs 0.055 kg. Auxiliary contact blocks extend the switching functions of contactors and circuit breakers by providing additional normally open and normally closed contacts. They find typical applications in automation technology, mechanical engineering, and the control of industrial plants for feedback on switching states and for implementing interlocking and control circuits.