Siemens 6EC1652-3A Industrial Proximity Relay Module

Siemens 6EC1652-3A is a SIMATIC C1 Module in the "Simple Block" format, a compact plug-in unit designed for use within older Siemens automation systems. In packaging listings, the part is identified as "6EC1652-3A" with status "In Package," signaling that the component is offered in its original packaging. The 6EC1652-3A appears in the historic SIMATIC ST11 catalog (1981) as part of the C1 family of modules, which were used as modular building blocks within early PLC configurations. As a Simple Block, the 6EC1652-3A represents one of the modular elements that would be combined with other C1 or SIMATIC components to create a tailored control solution, aligning with Siemens' long‑standing practice of building block‑style automation hardware. While contemporary references focus on newer S7 platforms, the 6EC1652-3A remains relevant for collectors, refurbishers, or maintenance engineers working with legacy Siemens installations that rely on the C1 module ecosystem.