From Anderson Power Products, this range of connector housings with contacts are mechanically keyed colour coded housings prevent accidental mating of equipment operating at different voltages. Their genderless design assures versatility and convenience, and the single piece housing is robust and practical. A robust product, these connector housings and contacts are capable of 10000 connect / disconnect cycles, and the silver plated contacts offer longevity when using high power. The range also features flat wiping contacts and have a UL voltage rating of 600V.
Link to Anderson components web site for data sheet of this product
http://docs-europe.electrocomponents.com/webdocs/07b3/0900766b807b3ee1.pdf