Overview
The 6ES7403-1TA11-0AA0 is a Siemens SIMATIC S7-400 ER1 aluminum extension rack with 18 slots for signal modules, supporting up to two redundant power supplies. Siemens has phased this rack out, with discontinuation effective October 2025.
Lifecycle & availability
Siemens lists the 6ES7403-1TA11-0AA0 as phase-out with a discontinuation date of October 2025. No official successor rack is named, so sourcing now runs through surplus and broker channels. For a BOM freeze or line-down need, an RFQ is the fastest path to confirm available quantity and lead time.