350991-4 is a 12-circuit Universal MATE-N-LOK socket header connector designed for wire-to-board power circuit applications in home appliances, particularly gas appliances. This connector features a long tail configuration optimized for 0.125 inch (3.18 mm) thick PCB mounting with pre-tin duplex plating (gold mating area over nickel underplate with matte tin on solder tail). The connector has a 1.050 inch (26.67 mm) A dimension and UL94V-0 flammability rating, providing reliable electrical connections with positive locking mechanisms. The duplex finish ensures excellent corrosion resistance and reliable mating performance. This connector is commonly used in power distribution circuits where robust, keyed connections are required to prevent incorrect mating and ensure safe operation in demanding thermal environments.