The **Siemens SIRIUS 3RH2131-2BB40** is a **contactor relay** with **3 NO + 1 NC** contacts, operating at **24 V DC** with a **spring-loaded terminal*
The 3RH2122-2A appears to be an auxiliary contactor relay, commonly used in industrial automation and control systems. It is associated with Siemens' SIRIUS 3RH2 series.
Contacts: 2 NO (normally open) + 2 NC (normally closed)