NT Series

NEMA Standard Three Phase Asynchronous Motors

Technical Characteristics:

Frame Size (T)


Output Power (HP)


Rated Voltage (V)

230/460, 460, 575

Frequency (Hz)


Speed (r/m)

3600, 1200, 1800

Number of Poles

2, 4, 6


F1, F2

Protection Class

IP55 or above

Insulation Class

F or above

Temperature Rise



1.15 service factor (S1)

Cooling Method


  • Product Detail

NT series (Inverter Duty) NEMA standard three phase asynchronous motors are Totally Enclosed Fan Cooled motors, designed and manufactured to meet or exceed efficiency values of NEMA MG-1. The motor has the characteristics of high efficiency, low temperature rise, low noise and vibration, high starting torque, solid structure, durability, safety and reliability.

Wonder NT Series are UL and CSA certificated.

Wonder NEMA standard motors cover optional multiple designs of A, B, C, D, making them suitable for different types of applications. Special designs and manufacturing requirements can be customized, such as type TC or TD, class H insulation, or different voltage and frequency.


NEMA Design A

Normal starting torque, high to medium starting current, high breakdown torque, maximum 5% slip. Able to handle heavy loads in a short time, well suited for variable speed operation, exhibiting low slip and high efficiency.


NEMA Design B

Starting torque is similar to type A, but sometimes lower. Providing a lower starting current.  It locks the rotor torque in industrial applications but still allows the starting load. The slip is less than or equal to 5%. High efficiency and high full load power factor. Well suited for variable torque, constant torque and constant horsepower applications.


NEMA Design C

Provides high starting torque (higher than types A and B, usually more than 200% of the rated torque). It is often used to drive heavy starting loads. Low starting current. The slip is less than or equal to 5%. Medium efficiency motors, well suited for equipment with high inertia and high starting torques at start.


NEMA Design D

Provides the highest starting torque of all NEMA motor types. Low starting current and full load speed. High slip (ranging from 5-8% instead of 1-5%) creates a stronger torque.  The motors can run almost at full speed without overloading, well suited for machinery with high peak loads.


Main Tech Specifications:

  • Frame Size: 140T - 440T
  • Rated Power: 1-300HP
  • Voltage: 230/460V, 460V, or 575 V
  • Speed: 3600, 1200, 1800r/m
  • Poles: 2, 4, 6
  • Protection Class: IP55 or above
  • Insulation Class: Class F or above
  • NPT threaded terminal box
  • Roller bearings on drive end (for motors of which the frame size is 440 and above)


  • Water Treatment
  • Air Handling
  • Transmission Field
  • Mining
  • Energy; Oil; Gas; Petrochemical
  • Electricity; Electric Power
  • Construction
  • Infrastructure
  • Agriculture
  • Aquaculture
  • Textile


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If you are interested in our products and service, or other information about Wonder, leave a message please. We will give you feedback within 24 hours.