ABB 1SAP210400R0001 - TU552-CS31 Interface Terminal Unit (AC500 S500)

The ABB 1SAP210400R0001 is the order code for the TU552-CS31 interface terminal unit of the AC500 S500 I/O family: a spring-contact base unit for CS31 bus configurations with 24 VDC supply, recorded with EAN 4016779650236 in distributor catalogs. Listings across major distributors show consistent descriptions and stock, including refurbished units with warranty. The TU552-CS31 serves as the bus-coupling base for S500 I/O assemblies communicating over CS31; the screw-terminal counterpart is TU551-CS31 (1SAP210600R0001). Confirm terminal style and network type against your system documentation before ordering.