Siemens 6ES5 700-3LA12 Simatic S5 Rack Module

Siemens 6ES5 700-3LA12 is the CR 700-3 mounting rack (CR3) for the SIMATIC S5 family, a 19-inch backplane-style subrack designed to house the S5-115U/H central controller and its I/O modules within a standard control cabinet. This central mounting rack provides the mechanical frame and electrical interface required to configure S5-115U/H systems in either centralized or distributed configurations, keeping the legacy S5 hardware organized and accessible for maintenance. The 6ES5 700-3LA12 part number uniquely identifies this CR3 rack within Siemens’ SIMATIC S5 lineup, making it a common replacement or upgrade component for existing S5 installations that use CR3 backplanes. Typical applications include retrofitting or sustaining older automation lines that rely on the S5-115U central controller, where a compatible CR3 rack is needed to mount the CPU and expansion modules in a 19-inch cabinet environment.