Westinghouse OT1L Contact Block 450D818G01

The Westinghouse OT1L Contact Block (part number 450D818G01) is a legacy auxiliary contact block designed for use with OT series pushbutton stations, selectors, and control devices in industrial control systems. This compact component provides additional normally open (NO) or normally closed (NC) contacts to expand the functionality of pilot devices, enabling reliable switching in control circuits for machinery, automation, and electrical panels. Key features include a robust phenolic base for durability, screw terminals for secure wiring, and compatibility with Westinghouse's oiltight control stations. Advantages over similar products include its proven reliability in harsh industrial environments, easy snap-on installation, and adherence to NEMA standards for heavy-duty applications. Benefits include enhanced circuit flexibility and reduced downtime due to its modular design, while drawbacks may involve limited availability as a discontinued item and potential incompatibility with modern non-Westinghouse systems without adapters. Typical applications span manufacturing, oil and gas, and power distribution where reliable contact expansion is needed. This unit appears to be new old stock (NOS) based on the original packaging, though the item shows some dust and minor wear from storage. No parent/child assets are evident in the images. For detailed model decoding, refer to Westinghouse/Eaton legacy catalogs; the 'OT1L' likely indicates a single-pole left-mounted contact block.