Baldor EM4103T 25 HP NEMA Premium TEFC Motor, 284T Frame

Overview

The Baldor EM4103T is a 25 horsepower Baldor-Reliance general purpose motor in a cast iron NEMA 284T frame, made by ABB Motors and Mechanical Inc. It is a four pole, TEFC three-phase induction motor rated 1775 rpm at 60 Hz with a 230/460 V dual voltage winding, and its 93.6% nominal full load efficiency qualifies it as NEMA Premium. At this size the motor typically drives larger centrifugal pumps, fans and compressors, where energy cost over its life far exceeds its purchase cost, so high efficiency matters. Like many Baldor-Reliance general purpose motors, the nameplate includes a 50 Hz rating, here 25 HP at 190/380 V.

Industrial plants, facility operators and package builders in Muscat and throughout the Sultanate of Oman and the GCC can source the Baldor EM4103T through Seven Star LLC, along with other Baldor-Reliance motors. Equipment shipped from North America, including chiller plants, fire and process pump sets and air compressors, often uses NEMA 284T motors, and replacing like for like avoids changes to bases, couplings and belt drives. Our Muscat team holds gives engineering help on these replacements.

Operating Principle

In general terms, an induction motor converts electrical power into torque through the rotating field set up by its three-phase stator winding, which induces current in the squirrel cage rotor. The four pole Baldor EM4103T turns its field at 1800 rpm on a 60 Hz supply, and the typical test data show the shaft at 1799 rpm unloaded and 1778 rpm under rated load, close to the 1775 rpm nameplate speed. Its efficiency curve is flat across the useful load range, from 92.8% at half load to 94.0% at full load in the typical test data, so the motor stays efficient even when the driven machine is lightly loaded.

The Baldor EM4103T is a NEMA Design A motor with KVA code J. At 460 V the packet lists 142 lb-ft of locked rotor torque, 118 lb-ft pull-up and 262 lb-ft breakdown torque, with 223 A drawn at start. As general guidance, Design A motors can draw higher starting current than Design B, so starter and protection settings, or a soft starter or drive, should be checked against these values. Winding temperature rises by just 51 °C at full load (61 °C at service factor load) against the Class F limit, so the insulation runs cool in 40 °C surroundings.

Engineering Design of the Baldor EM4103T

Mechanically, the Baldor EM4103T uses an iron frame with rigid base and F1 mounting, a 1.875 inch shaft and an overall length of 27.76 inches; its shipping weight is 425 lb, and standard lifting lugs are fitted. The drive end bearing is a 6311 and the opposite drive end bearing a 6309, both ball bearings greased with Polyrex EM, with a locked bearing and a shaft slinger. Its nine 10 AWG leads can be reconnected for either supply voltage; full load current is 62 A on 230 V and 31 A on 460 V, and power factor is 81.

On its nameplate the Baldor EM4103T is shown as usable on 50 Hz, delivering 25 HP at 190/380 V and 72/36 A (service factor 1.0). The same plate declares it inverter ready, with 10:1 constant torque operation down to 6 Hz and 20:1 variable torque operation down to 3 Hz. Users on 400 or 415 V, 50 Hz networks should compare their supply voltage with the 380 V rating before installation. The motor carries CURUS, EEV and NEMA Premium marks and is rated for continuous duty.

Key Features

The Baldor EM4103T key features taken from the manufacturer’s customer information packet are:

• Four pole 25 HP output at 1775 rpm, reconnectable for 230 or 460 V.
• Full load nominal efficiency of 93.6%, meeting NEMA Premium.
• Also rated 25 HP on 50 Hz at 190/380 V (service factor 1.0).
• Cast iron NEMA 284T rigid base frame with 1.875 inch shaft.
• Totally enclosed fan cooled construction with Class F insulation and a 1.15 service factor.
• Low temperature rise of 51 °C at rated load.
• Suitable for PWM drives over 10:1 constant torque and 20:1 variable torque ranges.
• Locked bearing, shaft slinger and 6311/6309 ball bearings.

Industrial Applications

A 25 HP four pole motor sits in the middle of the industrial power range and drives many critical loads. The Baldor EM4103T is suited to end suction and split case pumps for chilled water, cooling water, irrigation and process transfer, large centrifugal fans and cooling tower fans, rotary screw air compressors, crushers, conveyors and mixers. With a VFD it can run pumps and fans at reduced speed for significant energy savings, while its cast iron frame and TEFC enclosure suit outdoor and dusty locations when properly protected.

In Oman and the GCC the Baldor EM4103T is relevant for district cooling plants and building chiller plants in Muscat, water pumping and desalination plants on the coast, cement and mining operations in the interior, food and beverage factories in the industrial estates of Rusayl, Sohar and Nizwa, and oil field utility packages. Seven Star LLC supplies the Baldor EM4103T together with drives and spare bearings, helping operators keep critical pumps and compressors in service.

Technical Specifications

Figures for the Baldor EM4103T listed here were read from its ABB data packet (performance figures there are typical rather than guaranteed).

How to Order

Request a formal quotation for the Baldor EM4103T by sending us the catalog number, the number of motors and a photo of the old nameplate if this is a replacement. You can download the ABB data packet for this motor from the documents section of this page. Seven Star LLC keeps engineering support in Muscat for Baldor-Reliance motors across Oman and the GCC. Drives that pair well with a 25 HP motor include ABB ACS580 General Purpose Variable Frequency Drive (VFD) and ABB ACS550 General Purpose AC Drive 0.75 to 355 kW; if your plant uses IEC frames, compare ABB 3GBP131260-ASK Motors M3BP.