Baldor Electric
Baldor Electric M3531 1/4 HP 56 Frame Three-Phase Motor
Three-phase general-purpose motor delivering 1/4 HP at 1,140 RPM in a 56 frame with 230/460 V operation and 68 % nominal efficiency
- 1/4 HP three-phase power for continuous industrial duty
- 68 % nominal efficiency reduces energy consumption
- 35 service factor handles intermittent overloads
- Steel frame with ball bearings ensures durable operation
- 230/460 V dual-voltage suits common supply networks
1/4 HP 56 Frame Three-Phase Motor
This Baldor-Reliance M3531 is a general purpose motor rated at 1/4 horsepower with a 56 frame size. It operates on 230/460V AC three-phase power at 60 Hz with a nameplate speed of 1,140 RPM. The totally enclosed fan cooled design suits continuous duty in industrial environments.
Upgrade from single-phase or lower efficiency units
Replacing a single-phase motor with this three-phase model provides smoother torque and simpler starting without capacitors. The jump is worth it when your supply is three-phase and you need the 1.35 service factor for occasional overload capacity. The 68 percent nominal efficiency meets baseline requirements for general purpose applications.
Rigid base mount with dual voltage wiring
Installation uses the rigid steel base with standard 56 frame dimensions for direct replacement. The dual voltage design requires correct wiring for either 230V (1.4 A) or 460V (0.7 A) operation; miswiring is the most common error. No thermal protection is built in, so external overload protection must be provided per code. CW/CCW rotation is configurable by lead swap.
Highlights
- 1/4 HP three-phase power for continuous industrial duty
- 68 % nominal efficiency reduces energy consumption
- 35 service factor handles intermittent overloads
- Steel frame with ball bearings ensures durable operation
- 230/460 V dual-voltage suits common supply networks
Specifications
| Brand | BALDOR ELECTRIC |
|---|
Questions about this item
Does the 56 frame motor use a rigid base for mounting?
Yes, the motor has a rigid base mounting type designed for direct bolting to a flat surface.
How are the 230/460V leads connected for the correct voltage?
The nine-lead terminal box must be configured in parallel for 230V or series for 460V; the step often missed is verifying the nameplate diagram before energizing.
When should the ball bearings be inspected or replaced?
Inspect the ball bearings annually under continuous duty at 40 C ambient; replace them if noise, vibration, or excess heat develops.
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