Industrial HC21A215 Miniature Watertight Pressure Switch

ASCO HC21A215 is a compact miniature watertight pressure switch from ASCO’s H-Series, designed for reliable pressure-controlled switching in damp environments. It is specified for a 40–120 PSIG operating range and uses a 1/8 in NPT connection for straightforward installation into piping or equipment lines. The Mfr part number HC21A215 identifies this exact unit, which is listed by distributors and in H-Series catalogs as a 40–120 PSIG option; variants exist with internal or external process connections and watertight enclosures (for example HC21A215L). This family is commonly used to sense system pressure and drive control circuits in applications such as water pump systems, where a compact, sealed switch is advantageous. Availability may vary, and some listings note the HC21A215 as discontinued.