TU532-H is the hot-swap version of ABB's spring-terminal base for compatible AC-voltage and relay I/O modules. The white product marking identifies the hot-swap-capable terminal-unit construction within the supported AC500 and S500 arrangement.

The base retains forty field terminals and provides four groups for up to thirty-two module-defined channels. Hot-swap capability applies only when the inserted I/O module, hardware index and system configuration also meet the documented conditions.

• The H designation separates this hot-swap base from the standard TU532 product.
• Spring terminals retain the installed field conductors while a compatible I/O module is exchanged under the approved procedure.
• Two module locks must fully engage before the associated load circuits are returned to operation.
• Four terminal groups keep the module-defined signal allocation organized for service work.
• The field base supports horizontal or vertical installation when ABB clearance and grounding requirements are followed.

• Maintenance-sensitive AC500 and S500 I/O stations where the selected I/O module explicitly supports hot swap.
• AC and relay signal groups that must preserve terminal wiring during a compatible electronics-module exchange.
• Industrial control panels using spring-clamp conductors and documented isolation procedures.
• Service strategies that require clear separation between the terminal base, plug-in module and live load circuits.

• Keep order code 1SAP215100R0001 and the H suffix together; TU532 and TU532-H are not the same service item.
• Before hot swap, remove output load current and switch off I/O voltages above SELV or PELV as required by ABB instructions.
• Hot swap applies to supported I/O modules, not to processor or communication modules mounted elsewhere in the station.
• After insertion, confirm both snap-fits are locked before reconnecting loads or higher I/O voltages.