R7023B1003-REB Rebuilt/Exchange per your model B 1003
These controls are used as flame detector relays and may be used to signal the presense of any source of ultraviolet light, including electric arcs in generators, motors, and switching gear.
These controls are OBSOLETE but can be purchased rebuilt with your exchange. The R7023 is a flame detector relay only. A suitable primary control must be used to provide safe-start check, safety lockout, load switching, and other required functions in flame safeguard systems.