Siemens 3RH1921-1EA20 Interruptor auxiliar 2 contactos NA Compatible con la marca (relé): Siemens 1 UD(S).

first lateral auxiliary switch 2 NO contacts, screw terminal, for contactors 3RT1 auxiliary switch SIRIUS 3RH19 for the expansion of auxiliary contacts in the control circuit.
This 3RH19 auxiliary switch can be fitted to 3RT1 contactors of sizes S0 - S12 without tools.
The 3RH19/3RH29 auxiliary switches are available as versions for front or lateral mounting, with up to four instantaneous contacts or up to two leading NO and NC contacts. The auxiliary switches can be designed as positively driven contacts in 3RH contactor relays or also as mirror contacts in the case of 3RT power contactors. All of them are available with screw terminal and spring-type terminal.
Simple, efficient and always up to date - SIRIUS modular system.