Reliance 45C166 Output Module

Reliance 45C166 Output Module is a Reliance Electric AutoMate dual contact output module with normally closed contacts, intended for legacy Reliance AutoMate DCS 5000 and AutoMax digital I/O racks. Each output channel provides a normally closed contact pair and is electrically isolated from the others, enabling independent switching of discrete loads without cross-talk. The module is rated for up to 3 A at 250 V AC per output, suitable for energizing relay coils and other relay-type devices in industrial control panels. In practice, the 45C166 sits in Reliance Electric AutoMate I/O backplanes and is documented in historical manuals and catalogs as compatible with AutoMate rails and modules, reflecting its role in older automation architectures that used relay-style I/O. The part is commonly referenced in catalogs under the 45C166 family and is sometimes cataloged as 45C-166A in vendor listings. As with many vintage I/O modules, availability today is through specialized distributors and secondary-market sources, and technicians maintaining these systems routinely verify pinouts and compatibility with their specific chassis before replacement.