4″ Encapsulated Submersible Motors

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Franklin offers 4-inch motors in a full line of single- and three-phase voltages, frequencies, and application-specific models. Wherever there is an independent source of clean groundwater, you can find a Franklin motor.


  • These motors are built for dependable operation in 4” diameter or larger water wells.

Basic Features

  • Single-phase Voltage 230 V 60 Hz, 220 V 50 Hz
  • Three-phase Voltages 200 V, 230 V, 380 V, 575 V 60 Hz, 460/380 V 60/50 Hz
  • Corrosion-Resistant Construction
  • Stainless Steel Splined Shaft
  • Hermetically-Sealed Windings
  • Anti-Track Self-Healing Resin System
  • Water Lubrication
  • Filter Check Valve (Water Well)
  • Kingsbury-type Thrust Bearing
  • Pressure Equalizing Diaphragm
  • Built-in Lightning Arrestors (single-phase)
  • Removable Water-Bloc™ Lead installed in 60 Hz and dual frequency rated water well motors. Consult factory for additional leads
  • NEMA Pump Mounting Dimensions
  • UL 778 Recognized (North American Voltages)
  • CSA C22.2 #108 Certified
  • Sand Fighter Slinger

Special Features

  • 316 Stainless Steel: Special construction option for acid, low pH, and saline applications.
  • Oil Stripper: Special construction option for secondary oil recovery wells, geothermal, or other applications with high ambient temperatures. Consult factory for details.
  • Pollution Recovery: Motors equipped for use in monitoring and recovery wells in which hydrocarbons and other chemicals may be present. Special Viton® rubber parts and other chemical resistant materials as listed in Construction Materials chart.
  • CBM+: Increased bearing capacity. Kingsbury-type thrust bearing rated for 5-10 hp – 1,500 lbs. downthrust or 15 hp – 3,500 lbs. downthrust. Contains reinforced diaphragm housing and diaphragm filter shield.
  • World Wide Adaptability: All standard voltage and Hertz ratings are offered. Contact Franklin Electric for availability.
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