Protectorelay oil burner control – 45 sec. Lock out timing. this 4-1/8″l x 2-1/2″w x 4-3/8″h unit controls oil burner, oil valve and the ignition transformer in response to a call for heat. Solid state flame sensing circuit. Led for lockout indication and manual trip lever on safety switch assures burner shutdown during servicing. Mounts on a standard 4 x 4 inch junction box or directly mounts on burner housing.