Artifact Details


Relay assembly

Catalog Number



Physical object


One (1) relay assembly in covered metal case. The silver-gray metal case has a hammered-texture finish. A black, circular pull-switch protrudes through the cover at the lower-left edge. The front side of the cover has a 3/4 inch X 2 3/8 inch opening, which is mostly covered by a piece of cardboard attached within. A 5/8 inch by 3/4 inch opening has been cut into the cardboard. The back side of the cover has a matching opening cut through the metal cover, parallel to the opening in the front. Two metal tabs are attached at the back cover and act as hinges; the cover may be completely removed. A flathead screw with a silver collar/plug secures the cover to the base. The base of the assembly is covered with numerous components, within five major groupings. The grouping at the top-left is labeled " C1, C2, C3, C4, C5" on the base at the components left-side. The grouping at the bottom-left is marked "FRAKO, RPZ(X)-Nr.4291/1, A1 E1A2 E2, Bv 394 V32, 5.61" on the top of the square component. A round, black pull-switch is located just below this component. The middle grouping is labeled "Wi 1, Wi2, Wi3" on the base to the left of the grouping. The top-right grouping is labeled "A,B,C,V,VV" on the base to the right of the grouping. A sticker above this grouping reads "Rotkopfschraube dient nur zur Transportsicherung." The bottom-right component is labeled "Si1 and Si2" on yellow, oval stickers to the right of the component. The top-left corner of the exterior bottom of the case is marked "KR" in blue.

Identifying Numbers

Other number RPZ(X)-Nr.42291/1 Located on square component at lower-left corner of assembly (cover removed) just above pull switch
Other number Si1 Located at lower-right corner of assembly (cover removed) on yellow oval sticker
Other number Si2 Located at lower-right corner of assembly (cover removed) on yellow oval sticker


overall: 3 in x 12 1/4 in x 9 in



Collection Title

SAP Collection


SAP Collection, Computer History Museum

Lot Number