Old Number PA404A-1033

Pressure actuated high limit safety control for steam heating boilers - Breaks an electrical circuit to shut down the burner if steam pressure rises above a safe level

Contains a single pole single throw (SPST) MICRO SWITCH snap acting switch

Sensitive pressure actuated diaphragm expands or contracts with pressure variations, moving a lever mechanism which operates the snap switch

A screw on top of the case allows set point adjustment without removing the cover - 1/4 inch FIPS connection

Differential is adjusted by means of a dial located inside the case with 1 to 5 PSI adjustment range