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Dayton 31TT11 three-phase motor, steel frame, rigid base, open drip proof enclosure

Dayton

Dayton 31TT11 3-Phase Motor 1/2 HP 56 Frame 230/460V AC

SKU CH-YSW4-2CJ27

Three-phase general-purpose motor delivers 1/2 HP at 1,140 RPM with dual 230/460 V AC voltage and 75.3 % nominal efficiency

  • Runs on standard 230/460V three-phase power
  • Copper windings support efficient operation
  • 3% nominal efficiency reduces energy use
  • 25 service factor handles load peaks
  • 1140 RPM at 60 Hz suits HVAC fans

Dayton 3-Phase 1/2 HP 56 Frame Motor

The Dayton 31TT11 is a three-phase general purpose motor rated at 1/2 horsepower in a 56 frame size. It operates on 230/460V AC at 60/50 Hz with a nameplate speed of 1,140 RPM. The open drip-proof enclosure uses steel frame construction with ball bearings and Class B insulation. It is suited for continuous duty in industrial or commercial equipment.

Suitable for three-phase 230/460V systems only

This motor suits installations that supply three-phase power at 230 or 460 volts and require a 56 frame footprint with rigid base mounting. Buyers needing single-phase input, a different frame size, or built-in thermal protection should look elsewhere. The lack of motor thermal protection means external overload devices are required for safe operation.

Fits 56 frame rigid-base mounts with CW/CCW rotation

The rigid base and reversible shaft rotation allow direct replacement in existing 56 frame mounting patterns. Copper windings and a 1.25 service factor provide margin for continuous loads up to 40 °C ambient. Nominal efficiency of 75.3 percent and full-load currents of 2.8/1.4 A help size starters and conductors. The open enclosure requires a clean, dry environment.

How it compares

Measured against everything we stock in Heating & Cooling Controllers, at today’s prices. Recalculated every night.

Price $479.99
Pricier than about 91% of the 1,762 comparable items (median $45.99).

Specifications

Product
Brand nameDAYTON

Questions about this item

Do I need a three-phase 230/460V AC supply rated for at least 2.8 amps to run the 1/2 HP motor?

Yes, the motor requires a three-phase 230/460V AC source (60/50 Hz) and draws 2.8 A at 230 V or 1.4 A at 460 V.

Can I keep my existing rigid-base frame 56 mounting and CW/CCW shaft setup with this motor?

The motor uses a rigid-base frame 56 mount and supports CW/CCW rotation, so it fits the same footprint and shaft orientation.

How do I verify the motor is running at its rated 1140 RPM and 75.3 % efficiency after installation?

Measure shaft speed with a tachometer under load — it should read about 1140 RPM — and confirm current draw is near 2.8 A at 230 V or 1.4 A at 460 V.

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