836-A4AX15A - 836 Pressure Controls - General Industrial, Device Style A, Internal Copper Alloy Bellows, Type 1 enclosure, X15A, External Manual reset contact block. Single pole double throw, one contact normally closed - contact opens on rise and remains open until system is restored to normal run condition at which time contact can be manually reset. A second contact closes when the first contact opens. - Quad Industry GmbH