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Cast iron submersible sump pump, tether float switch, 115V AC

Zoeller

Zoeller BN2057 1/3 HP 115V Submersible Sump Pump Trap

SKU CH-R0YR-7QMCY MPN BN2057

Submersible 1/3 HP cast-iron sump pump with tether-float switch delivers 39.0 gpm at 5 ft head and 18 ft max head

  • TypeDrain Components
  • MaterialCast Iron
  • 1/3 HP motor delivers 39.0 gpm flow at 5 ft head
  • Cast iron body and impeller resist corrosion for long service life
  • Tether float switch activates at 13 1/4 in and shuts off at 4 1/4 in
  • 115 V AC, 60 Hz operation draws 9.7 A for standard household wiring
  • Maximum 18 ft head handles typical residential basement drainage needs

1/3 HP 115V Submersible Sump Pump

The Zoeller BN2057 is a cast-iron submersible sump pump rated at 1/3 horsepower for 115-volt, 60 Hz residential service. It delivers 39.0 gallons per minute at five feet of head and 31 gallons per minute at ten feet of head. Maximum shut-off head reaches 18 feet. A tether-float switch with piggyback plug actuates at 13 1/4 inches on and 4 1/4 inches off.

Pre-Installation Electrical and Pit Checks

Verify the circuit supplies 115 volts AC at 60 Hz and can handle the 9.7-amp running draw with a dedicated breaker. Confirm the sump pit diameter meets or exceeds the 18-inch minimum so the tether float swings freely without binding. Ensure the discharge piping accommodates 1-1/2 to 3-inch connections and that the 10 1/8-inch overall height fits the pit depth.

Integrated Switch and Durable Construction

The piggyback tether float switch allows plug-in operation without hard-wiring a separate control box. Cast-iron body, impeller, and carbon/Ni-Resist shaft seal resist wear from abrasive groundwater and high-temperature discharge. No external controller or check valve is included; those must be sourced separately for a complete installation.

Highlights

  • 1/3 HP motor delivers 39.0 gpm flow at 5 ft head
  • Cast iron body and impeller resist corrosion for long service life
  • Tether float switch activates at 13 1/4 in and shuts off at 4 1/4 in
  • 115 V AC, 60 Hz operation draws 9.7 A for standard household wiring
  • Maximum 18 ft head handles typical residential basement drainage needs

Specifications

TypeDrain Components
MaterialCast Iron
BrandZoeller
ModelBN2057

Questions about this item

What comes with the Zoeller BN2057 sump pump and what must be purchased separately?

The pump includes a tether float switch with piggyback electrical connection built into the unit. Discharge piping, check valve, and any required fittings for 1-1/2" to 3" connections are not included and must be sourced separately.

How do I choose between the flow-rate figures at 5 ft, 10 ft and 15 ft of head for the BN2057?

Match the pump to your system’s total dynamic head: at 5 ft head it delivers 39.0 gpm, at 10 ft head 31 gpm, and at 15 ft head 17.0 gpm. Select the figure that corresponds to the actual head your installation will see.

What does the 18 ft maximum head mean when the BN2057 is installed in a real sump pit?

The pump can lift water up to 18 ft vertically, but flow drops to zero at that height. For usable flow, size the system so the operating head stays well below 18 ft — for example 10 ft head still provides 31 gpm.

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