836-C3EX150 - 836 Pressure Controls - General Industrial, Device Style C, External Copper Alloy Bellows, Type 7 & 9 and 4 & 13 Combined Metallic Aluminum enclosure, X150, External Manual reset contact block. Single pole single throw, normally closed - contacts open on rise and remain open until system is restored to normal run conditions at which time contacts can be manually reset. - Quad Industry GmbH