Siemens 3RH1911-2FA40 Auxiliary contact block

The auxiliary contact block, also known as auxiliary switch block or additional switch block, with type number 3RH1911-2FA40 from Siemens is an electrical component for contactors. It serves to extend the functionality of main contactors by providing additional switching contacts for control circuits. It has the dimensions 5 x 5 x 5 cm and weighs 0.05 kg. Auxiliary contact blocks are typically used in industrial control systems, in automation technology, and in complex machines and plants for monitoring and controlling various operating states.