RS 55
The Ingersoll Rand RS 55 is an industrial oil-flooded rotary screw model size with fixed-speed and variable-speed versions in the current US lineup.
Current model Availability checked 17 Sep 2026The RS 55 is listed in Ingersoll Rand’s 45–75 kW product group. The current table includes RS55i, RS55n. Retain these suffixes when comparing performance or looking for instructions.
This model size includes more than one control choice. Compare fixed-speed and variable-speed versions using delivered airflow, package input power and the expected demand pattern at the same working pressure. Do not carry a rating from one suffix over to another.
Options and variations
The listed suffixes for this size are i/n. In current RS nomenclature i/ie identifies fixed speed and n/ne variable speed. Cooling, pressure, electrical supply and TAS availability depend on the version.
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