I have a sump pump that I would like to be able to monitor. When it turns on it draws power from a plug box on the side of my house. Can anyone tell me if there is anyway to monitor the current flow in a circuit? If I had a way to tell me when the pump turns on and off it would be great.
It'll be overkill in your case, but it'll help you see what it is you're looking for and what options are out there (CTs w/ relays, adjustable trip points, etc). In commercial/industrial installs, I use these to know when water pumps, fans, and other motors are running as confirmation to some other 'smarter' signaling method.
If you have trouble finding a smaller/cheaper option let me know; I just yanked this one out of memory, and I know it's bulletproof and covers a decent range of currents