Memory & latching relay MR-42Memory, pulse relay with stepping relay function for gradual switching of lighting.DESCRIPTION Thanks to the 2-wire parallel connection of buttons, the impulse relay will save you money and time spent on installation.. Switches lights, staircases, corridors, large rooms, control systems, automation. Memorize its last state even after supply failure. During the failure relay will turn off and after re-energizing will automatically turns on. Options – 2x parallel contacts or the other relay is latching.