Provides reliable alternating operation of two pumps with automatic override control in residential or commercial installations. Common applications include sump basins, effluent or sewage pump chambers and lift stations. Available in 3-float or 4-float configurations and NEMA 1 (indoor) and NEMA 4X (outdoor) enclosures. All panels must be ordered with the proper amp rating matching the pump. See the AE series specifications or consult Liberty Pumps for ordering assistance. Liberty Pumps®, AE21L=3, Series: AE Series, 120/208/240 VAC, 1 ph, 0 to 14.9 A, Specifications: NEMA 1 Enclosure, 3-Float, 10 x 10 x 6 in Enclosure, 20 ft Cord, For Use With: Model FL102M-2 Pump and LE41M Submersible Pump