BaldorEM31158Three-Phase ODP General Purpose Motor, 3 HP, 3450 RPM, 208-230/460 V, 56H Frame, 5/8 in Shaft

Product Description

What this part is

Baldor-Reliance EM31158 three-phase general purpose AC induction motor. Manufacturer: Baldor. Part Number: EM31158. Horsepower: 3 HP. Full Load Speed: 3450 RPM. Synchronous Speed Class: 3600 RPM, two pole. Phase: 3. Frequency: 60 Hz. Voltage: 208-230/460 V. Full Load Amps: 7.6 A at 230 V, 3.8 A at 460 V. NEMA Frame: 56H. Motor Type: 3528M. Enclosure: ODP, open drip proof. Mounting: F1 foot mount. Shaft: 5/8 in keyed. Frame Material: rolled steel. Service Factor: 1.15. Compliance: Small Motor Rule.

Decoding the designation

EM — Baldor’s Super-E energy efficient three-phase motor prefix.

31158 — the catalogue number that fixes the 3 HP rating at the 3450 RPM two-pole speed on the 56H frame.

3528M — the Baldor motor type code stamped on the nameplate.

F1 — the standard foot mounting position, with the conduit box on the left when viewed from the shaft end.

What these specs mean in practice

Horsepower: 3 HP. Full Load Speed: 3450 RPM. A two-pole motor runs at close to 3600 RPM synchronous, so it packs 3 HP into a 56 frame that would only carry about 1 HP at 1800 RPM. That power density is why two-pole 56 frame motors are the standard fit on high-speed pumps, blowers, grinders and centrifugal machinery. Full Load Amps: 7.6 A at 230 V, 3.8 A at 460 V. The 2:1 ratio between the two figures is the dual-voltage winding: the same motor is reconnected in the peckerhead for either supply, and the 460 V connection halves the current and the cable size. Service Factor: 1.15, so the motor is rated to run continuously at 3.45 HP. Enclosure: ODP, open drip proof. An open drip proof frame is ventilated with baffles that keep vertically falling liquid and particles out of the windings, which cools better than a totally enclosed frame and suits a clean, dry indoor installation. Frame Material: rolled steel. Compliance: Small Motor Rule, the US federal efficiency standard for small general purpose motors.

Mounting data

NEMA Frame: 56H. Mounting: F1 foot mount. Shaft: 5/8 in diameter, keyed. Frame Material: rolled steel. The 56H frame is the extended-base 56 frame: it carries a second set of foot holes so the motor bolts onto either a 56 or a 143T/145T footprint without a new base plate.

Quantity and configuration

Unit Quantity: 1 Pc. One complete motor per listing.

Condition

Condition: New.

Interchange guidance

EM31158 and EM-31158 are the same catalogue number. Within Baldor’s range the 31158 catalogue figure carries the 3 HP, 3450 RPM two-pole rating across executions: VEM31158 is the C-face 56C version on the same 3528M motor type, and EM3158T is the same electrical rating in the larger 145T frame.