Siemens 3TY2520-0A Auxiliary Contact Block Module

The Siemens 3TY2520-0A is a main contact set that mounts with Siemens 3TC52 contactors, providing eight main contacts for three-phase switching. Designed as an add-on/replacement module, it extends the contact capacity of a 3TC52 for heavier or more complex loads. Part number 3TY2520-0A is listed as the main contact set for use with 3TC52 in Siemens IC10 documentation and is shown in RS Online product listings as "Main Contact Set for use with 3TC52." This accessory is commonly used in motor control and other industrial automation applications where the 3TC52 is employed to switch three-phase loads. Siemens’ spare parts literature also documents 3TY2520-0A among main-contact accessories for contactors, reinforcing its role as a dedicated replacement or extension module rather than a standalone device. When selecting this part, ensure the 3TC52 model in use matches Siemens’ listed compatibility to maintain proper fit and electrical characteristics.