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Dayton 3-phase motor, open drip-proof steel frame, rigid base, silver-grey finish

Dayton

Dayton 31LH33 3-Phase Motor 1 1/2 HP 56H 230/460V

SKU CH-TBEK-58WJH

Three-phase general-purpose motor delivers 1 1/2 HP at 1760 RPM in a 56H frame with 230/460V dual-voltage operation and 86.5% nominal efficiency

  • Three-phase design delivers 1 1/2 HP for demanding applications
  • 230/460 V dual-voltage wiring suits varied supply systems
  • 1760 RPM nameplate speed matches standard equipment requirements
  • 5 % nominal efficiency reduces operating energy cost
  • 304 stainless steel construction resists corrosion in harsh environments

Motor Specifications

The Dayton 31LH33 is a three-phase general-purpose motor rated at 1 1/2 HP with a 56H frame. It operates on 230/460V AC at 60/50 Hz and suits industrial equipment requiring continuous-duty rotation. The rigid base mounting simplifies installation on flat surfaces. Buyers needing single-phase power or a different frame size should look elsewhere.

Thermal and Electrical Behaviour

The motor carries Class F insulation and a 1.15 service factor for sustained loads up to 40 °C ambient. Full-load current draws 4.2 A at 230 V or 2.1 A at 460 V with nominal efficiency of 86.5 %. No built-in thermal protection is fitted so external overload devices are required. Open drip-proof enclosure allows airflow but does not seal against moisture or dust.

Build Integration

A 304 stainless steel shaft and steel frame resist corrosion in damp environments. Ball bearings support bidirectional CW/CCW rotation for flexible drive configurations. The unit meets CSA and UL standards for North American installations. No mounting hardware or coupling components are included in the package.

Highlights

  • Three-phase design delivers 1 1/2 HP for demanding applications
  • 230/460 V dual-voltage wiring suits varied supply systems
  • 1760 RPM nameplate speed matches standard equipment requirements
  • 5 % nominal efficiency reduces operating energy cost
  • 304 stainless steel construction resists corrosion in harsh environments

Specifications

BrandDAYTON

Questions about this item

How do I wire the Dayton 31LH33 motor for 230 V versus 460 V, and which step is often missed?

Follow the nine-lead diagram on the nameplate: connect for low voltage (230 V) or high voltage (460 V) as shown, then verify rotation direction before coupling; the step most often missed is swapping any two supply leads to reverse CW/CCW rotation if the shaft turns the wrong way.

What maintenance will the ball bearings in this 56H frame motor require over time?

The motor uses sealed ball bearings that are lubricated for life; no re-greasing is needed, but plan to replace the bearings if noise or vibration appears after extended continuous duty at the 1.15 service factor.

At what ambient temperature does the Class F insulation reach its thermal limit during sustained full-load operation?

The motor is rated for a maximum ambient temperature of 40 °C; running continuously at 1 1/2 HP above this temperature will cause the insulation system to exceed its design limit first.

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