The E111818 is an industrial Coleman Sanborn pressure switch with a four-port unloader, designed to automate air compressor cycling in industrial pneumatic systems. It switches on at 145 psi and switches off at 175 psi, establishing a 145–175 psi cut-in/cut-out range. The four-port unloader configuration provides an unloading path during start/stop cycles, supporting smooth motor starts and predictable pressure control. Typical applications include controlling air compressors and other pneumatic equipment that require reliable, automatic pressure switching with a four-port unloader.
