Safety device for avoiding entrapment at a water reservoir drain

An electrical circuit adapted to shut-off power to a water reservoir pump having an intake coupled in fluid communication to a water reservoir drain whenever the drain becomes obstructed, the power being provided to the pump via first and second leads coupled between a power source and the pump, said electrical circuit comprising:

• a relay comprising a drive coil for driving a first associated switch and a second associated switch, said drive coil having a first end coupled to the first lead of the power source and a second end coupled through said first associated switch to the second lead of the power source, thereby defining a first return path;
• a parallel return path coupling said second end of said drive coil to the second lead of the power source through a vacuum-operated switch that is disposed at the intake of the pump, said vacuum-operated switch permitting a flow of current through said drive coil and through said vacuum-operated switch whenever said vacuum-operated switch experiences a partial vacuum draw of a predetermined pressure or greater partial vacuum;
• said first associated switch being closed whenever said flow of current exists;
• and said second associated switch being coupled in series between the power source and the pump and whenever said flow of current exists said second associated switch opens, thereby shutting-off power to the pump.