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Replacement relay for the original White Rodgers relay. Terminals 4 & 7 are normally open while terminals 4 & 1 are normally closed. When 24V terminals A and B are energized, it closes terminals 4 & 7 and opens 4 & 1. This relay will not look anything like the old original relay but it will work perfect. 24V coil. Used on all the following units: GDI, GDE & GDP. Wire changes from your old relay to the new relay are as follows: Move wire from terminal 1 on old relay to terminal A on new relay. Move wire from terminal 3 on old relay to terminal B on new relay. Move wire from terminal 4 on old relay to terminal 7 on new relay. Move wire from terminal 5 on old relay to terminal 1 on new relay. You will need new mounting holes. An easy way to do that is use some shorter self-tapping metal screws (not included). Also known as part number B1370752, 134-20103-333B & B13707-52. Our 2-minute video below shows how a simple relay works.