Carrier em2543t-g 50 Hp 326T Three Phase Opsb Motor

Product Description

The CARRIER em2543t-g is a 50 HP, three-phase, general-purpose AC induction motor built for continuous-duty industrial and commercial applications. Rated at 460 volts (also configurable at 230 volts) across a 60 Hz supply, it delivers a full-load speed of 1775 RPM on a 326T steel frame with OPSB (open protected splash-proof) enclosure. Insulation Class H and a 1.15 service factor allow the motor to handle intermittent overloads without thermal degradation. The inverter-ready design makes it compatible with variable frequency drive installations where speed control or soft-start capability is required.

This motor is suited for general-purpose industrial applications including pumps, compressors, fans, and conveyor drives in commercial and light-industrial facilities. The OPSB enclosure is appropriate for indoor or sheltered outdoor locations where splash exposure is possible but full submersion or heavy particulate ingestion is not. The F1 mounting arrangement and rigid base allow direct mounting to a bedplate or structural skid. Installation is typically performed by licensed industrial electricians or mechanical contractors familiar with large-frame motor alignment and NEC requirements for motor branch circuits.

Key Features

• 50 HP output at 60 Hz with a 1775 RPM full-load speed and 1800 RPM synchronous speed
• NEMA Premium efficiency rating — 94.5 percent efficiency at 100 percent load
• Inverter-ready design supports variable frequency drive operation
• Class H insulation with a 1.15 service factor for continuous-duty overload tolerance
• Polyrex EM bearing grease rated from -20 degrees F to 300 degrees F for wide ambient range
• Reversible shaft rotation with standard lifting lugs and shaft grounding included
• 9-lead configuration at 8 AWG flying leads enables dual-voltage wiring (460 V or 230 V)

Compatibility

Designed as an OEM-style general-purpose replacement or new-installation motor for three-phase, 326T frame applications requiring a 50 HP NEMA Premium motor with OPSB enclosure and F1 mounting.

Installation Notes

Installation should be performed by a licensed electrician in accordance with NEC Article 430 governing motor branch circuits, overload protection, and disconnecting means. Disconnect and lock out all power sources before handling motor leads or making mechanical connections. Verify shaft alignment with the driven load using a dial indicator before final coupling torque, and confirm that the VFD carrier frequency and output filter settings are compatible with the motor nameplate ratings when used in inverter applications. Do not energize the motor without confirming that overload protection is sized to the actual full-load amp draw at the selected voltage.

Technical Specifications

• Output: 50 HP at 60 Hz
• Full-Load Speed: 1775 RPM
• Synchronous Speed: 1800 RPM at 60 Hz
• Phase: Three Phase
• Frequency: 60 Hz
• Voltage: 460 volts / 230 volts at 60 Hz
• Full-Load Amps: 57 amps at 460 volts / 114 amps at 230 volts
• Efficiency at 100% Load: 94.5 percent
• Power Factor: 87
• Service Factor: 1.15
• Insulation Class: H
• Enclosure: OPSB
• Frame: 326T
• Frame Material: Steel
• Number of Poles: 4
• Mounting Arrangement: F1
• Base: Rigid
• Overall Length: 27.69 inches
• Shaft Diameter: 2.125 inches
• Motor Lead Quantity and Wire Size: 9 leads at 8 AWG
• Motor Lead Termination: Flying Leads
• Bearing Grease Type: Polyrex EM (-20 degrees F to 300 degrees F)
• Pulley End Bearing Type: Ball
• Shaft Rotation: Reversible
• Shaft Grounding: Yes
• Inverter Ready: Yes
• Starting Method: Direct on line
• Duty Rating: Continuous
• Ambient Temperature: 40 degrees C
• Speed: Single Speed
• Motor Standards: NEMA
• Efficiency Certification: NEMA Premium
• Agency Approvals: CURUSEEV
• Product Family: General Purpose
• Motor Type: 4256M
• KVA Code: G
• Design Code: A

Standard Information

• Brand: CARRIER
• Manufacturer Part Number: em2543t-g