The Siemens 3RU1926-3AA01 is a SIRIUS stand-alone mounting kit designed to physically support a Size S0 overload relay (such as the 3RU11 or 3RB10 series) when it is installed independently of a contactor. It provides the mechanical interface and wiring terminals for the main circuit, accepting screw-type connections with conductor cross-sections of 1 to 6 mm² (or 1x 16 to 8 AWG).
Lifecycle status and sourcing reality
Per the manufacturer's documentation, the 3RU1926-3AA01 is a phased-out product. The official preferred successor is the SIRIUS 3RU2926-3AA01, which serves the same function — stand-alone mounting for Size S0 overload relays — and should be specified for new designs or BOM updates where possible.