4-Inch Encapsulated Motor

The Franklin Electric 4-Inch Encapsulated Stainless Super Submersible Motor is a durable, industry-trusted choice for residential and light commercial water well systems.

• Proven 4-inch stainless encapsulated submersible motor, trusted in residential and light commercial wells for decades.

• Designed for dependable operation in 4-inch diameter or larger clean groundwater wells.

• Available in a wide range of single- and three-phase voltages, frequencies, and application-specific models for global use.

• Corrosion-resistant construction with a stainless steel splined shaft for long service life.

• Hermetically sealed windings and an anti-track self-healing resin system to protect internal components.

• Water-lubricated design with a filter check valve for reliable performance in water well environments.

• Kingsbury-type thrust bearing and pressure-equalizing diaphragm to handle high down-thrust and changing well conditions.

• Built-in lightning arrestors on single-phase models and removable Water‑Bloc lead on 60 Hz and dual-frequency water well motors for easier installation and service.

• NEMA pump mounting dimensions for compatibility with a broad range of submersible pumps.

• Certified to UL 778, CSA C22.2 #108, and NSF/ANSI 61 for safety and drinking water applications.

• Optional 316 stainless steel, Oil Stripper, Pollution Recovery, CBM+ high-thrust, Sand Fighter, and other special constructions for challenging water quality and demanding applications.