Redhead Electric Motors

General Description

NEMA B efficiency three phase induction motors are totally enclosed fan cooled squirrel cage motors that are manufactured with new material and technology.


  • Kind of motor: Squirrel-cage Induction Motor, NEMA B Design
  • Design Standard: NEMA MG1
  • Frame No: 213T ~ 449T.
  • Output Range: 1-300 HP
  • Ambient Temperature: 40 Cmax
  • Altitude 1000m
  • Duty: Continuous (S1)
  • Rated Frequency: 60Hz (50Hz is available on request).
  • Rated Voltage: 460V (380V is available on request).
  • Service Factor: 1.15 or 1.0
  • Protection Enclosure: TEFC, IP55
  • Cooling Method: Surface Cooling (IC411)


NEMA B efficiency motors have some notable advantages such as high efficiency, good starting performance, low noise, improved structure, and improved cooling capabilities. These motors are three phase induction motors which can be used for general motors and may also be used to drive all kinds of general purpose machines such as compressors, ventilators, pumps, etc. Other uses include petrol chemical, medical, chemical industries and mining. For special requirements please contact our sales department.

  • NEPM Premium Efficiency Motor
  • NEPM Premium Efficiency Motor
  • NEPM Premium Efficiency Motor



The stator core is laminated with high quality electrical steel with high permeability and low losses allowing the motors to operate more efficiently.

The stator windings utilize Class F insulation (Class H insulation is available on request)with polyimide enamel round wire and VPI treated providing strong mechanical support, superior electrical insulation, misture and contamination resistance, and uniform heat dissipation.

Thermistors(PTC) are embedded in windings (Thermostats are available on request), one each phase.


The squirrel-cage totors are of cast aluminum alloy. fixed on the shaft by means of hot fit. The rotor is dynamically balanced to reduce vibration.

Frame size Drive end bearingNon-drive end bearing
NEPM146206-2Z 6206-2Z
NEPM18 6207-2Z 6207-2Z
NEPM216208-2Z 6208-2Z
NEPM256309 6309
NEPM286311 6311
NEPM326312 6312
NEPM366313 6313
NEPM402P: 6313 | 4,6P:6318 2P: 6313 | 4,6P:6318
NEPM444-445 2P: 6314 | 4,6P: NU319 2P: 6314 | 4,6P: NU319
NEPM447-449 2P: 6314 | 4,6P: NU319 2P: 6314 | 4,6P: NU319

Bearing and lubrication

The motors are fitted with low noise and low vibration bearing special for motors. For the motors in frame size 210, bilaterally shielded ball bearing are used without replenishing grease. For the motors in frame sizes 250 and above, the open bearing are equipped with attachments having the function to drain and replenish lubricating grease without stopping the motor. No. 3 Lithium Base grease is used unless specified otherwise. Bearing design life is at least 40000 hours at rated load. Bearing size, see table 1.

Conduit Box

The conduit box is on the central libe of the enclosure. It can be F1/F2 convertible. The conduit box is made of cast iron and the opening utilizes Standard NPT threads (Metric threads and holes are available on request). There are grounding bolts and a connection diagram inside the conduit box.
Motor main leads and thermistor leads are loose keeping in conduit box (Therminal blocks are available on request).

Fan and Fan Cover

The fan is made of plastic or cast iron to different applications. The fan cover is made of steel sheet or cast iron depending on different operating conditions.


A sunshade is recommended when the motor is intended for outdoor installation in direct sunlight with an ambient temperature rating of over 40 degree C.

Electric Motor Specs

NEMA B MotorDescriptionProduct ID
5HP6P 215T 60HZ 230/460VRH0056
10HP6P 256T 60HZ 230/460VRH0106
15HP6P 284T 60HZ 230/460VRH0156
20HP6P 286T 60HZ 230/460VRH0206
25HP6P 324T 60HZ 230/460VRH0256
30HP6P 326T 60HZ 230/460VRH0306
40HP6P 364T 60HZ 230/460VRH0406
50HP 6P 365T 60HZ 230/460VRH0506
60HP6P 404T 60HZ 230/460VRH0606
75HP 6P 405T 60HZ 230/460VRH0756
100HP6P 445T 60HZ 230/460VRH1006
150HP6P 449T 60HZ 230/460VRH1506

If you’re looking for peace of mind with your pumping equipment purchase, you’ve come to the right place. Contact Redhead Artificial Lift to get started.
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