Why the submersible pump takes high current or burnt after some time if it is run wihout water?
I designed a submersible pump for my company. Ours won’t burn up if run dry along with some others, but many will. This is because submersible pumps are generally designed to run in their intended environment – underwater. This means the engineer will design the motor to run hot because he or she knows that there will be plenty of cooling. This allows the motor to be cheaper and stronger than an air cooled motor. Pumps won’t usually draw higher amps running dry, though. I’m not sure if you measured current or not. Water is much more viscous and puts a higher load on the motor, drawing more current. This is my experience with the pumps I’ve dealt with, mostly sewage and sump pumps. Air is actually a pretty good insulation medium, and will keep the heat on a submersible pump pretty well. A good strong fan might provide enough air cooling to prevent the motor from burning up, but that doesn’t mean your pump is entirely safe… Submersible pumps generally have a carbon face seal sealing th
