TU532 is an ABB I/O terminal unit for compatible AC-voltage and relay modules. It separates permanent field wiring from the plug-in I/O electronics and uses spring terminals for fast, repeatable conductor termination.

The base provides forty front terminals arranged for as many as thirty-two module-defined channels. Four groups allow the inserted I/O module to assign up to eight channels per group within the documented voltage and current limits.

• Spring-clamp terminal technology distinguishes TU532 from the screw-terminal TU531 counterpart.
• The plug-in I/O module determines the actual channel allocation, allowing the same base concept to serve compatible AC and relay functions.
• Mechanical locks retain the module after it is fully seated on the terminal unit.
• The field conductors remain attached to the base when a compatible I/O module is removed for service.
• The compact base supports both horizontal and vertical panel arrangements within the documented installation rules.

• AC500 and S500 distributed I/O stations using approved AC-input, AC-output or relay modules.
• Control panels where spring-terminal wiring is preferred for maintenance and production assembly.
• Machine and process-control cabinets requiring a removable I/O module above a retained field-wiring base.
• Retrofit work where the exact terminal technology and module class must match the existing station.

• Use order code 1SAP217000R0001 to distinguish this standard spring-terminal version from TU531, TU532-H and XC variants.
• ABB lists TU532 as an active product, but the host I/O module and field-voltage class still require independent confirmation.
• Record the inserted module, terminal labels and group wiring before exchanging an installed terminal unit.
• Check conductor seating, protective separation and both module locks before restoring power.