I need a way to keep the 24 volt signal from being sent after the power has stopped flowing through the lead until it is manualy reset. The smaller the better. Explained again: Once the power is shut off, I want to keep the power from flowing through again until it is reset. A kind of shunt trip. Any sugestions?

Unsure of what you have for equipment, but I would think a relay with a manual reset would work.

http://www.sick-automation.ru/images/File/pdf/UE43-3MF%20Catalog%20Sheet.pdf