The 03-041149-00 is a pressure switch manufactured by Omron. It is a Non-Enclosed Pressure Switch with a 1/4" PT connection, and a differential pressure range of 30–600 mbar. The switch has a single changeover point and includes 4-pin terminal blocks, manual reset, and voltage ratings of 24 VDC/250 VAC. It is waterproof, dustproof, and oil-proof, and can be used in a variety of industrial applications, such as controlling pumps and compressors.