This is a Ranco (now part of Robertshaw/Invensys, Schneider Electric group) high-pressure control switch — a mechanical pressure-actuated safety switch used in refrigeration and air conditioning systems. It’s housed in a light-gray plastic enclosure with a scale-plate window showing pressure settings in both bar and PSI, a brass pressure-sensing fitting, and a wiring cover/knockout for electrical connections. It has a visible adjustment dial for cut-out pressure and differential.
Specs (from box label and cross-referenced documentation):
Manufacturer: RANCO, part of the Robertshaw/Invensys (Schneider Electric) group
Type: O16H6750
Function: High Pressure Control (H.P.)
Adjustment range (cut-out): 7→30 bar / (3)7→30 BAR marking on box = 100–435 PSI (two ranges shown: 7→30 bar / 100–435 PSI, and a second scale 2.5→8 bar / 35–115 PSI)
Contact configuration: SPDT (single-pole double-throw)
Reset type: Auto-reset (automatically resets once pressure drops back into normal range)
Certification: CE marked
Country of manufacture: Made in Romania
Connection: Flare/bördel-type pressure fitting
Ambient temperature range (from comparable O16H6750 data): −35°C to +60°C
