Part identity and deployment
The Siemens 3RF3125-2AA22 is a SIRIUS 3RF31 solid-state relay, one-pole, in the 22.5 mm housing. It is rated for 25 A continuous load current, with a control voltage range of 24-230 V AC and a load voltage range of 110-230 V AC. Termination is via spring-loaded terminals, which speeds wiring in panel builds and holds reliably under vibration.
Compliance documentation is in order: RoHS conformity effective since 15 January 2024, with a REACH Article 33 notification for lead (CAS 7439-92-1) above 0.1% w/w in the candidate list.
Catalog classification
Group code R711 and product group 3725 are the internal Siemens cataloguing fields. These are useful for cross-referencing against Siemens spare-parts lists or when ordering through Siemens Industry Mall filters — they confirm this is a standard solid-state relay, not a special or custom variant.