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ABB TU518 (1SAP211200R0001) S500 interface terminal unit for serial protocols, with spring terminals, IP20.
ABB TU518-XC (1SAP411200R0001) S500 interface terminal unit for serial protocols, spring terminals, rated for extreme conditions (operation -30 to +70 C).
ABB TU520-ETH (3ABD00029576) S500 interface terminal unit for gateway modules with pluggable spring terminal blocks.
ABB TU531 (1SAP217200R0001) S500 I/O terminal unit for 230 VAC and relay modules, with screw terminals, IP20.