Nema Starters
Nema size starters
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NEMA electrical motor starters refer to a standardized rating system for the electrical performance of the most common style of American-built motor starters. NEMA starters are rated by size: 00, 0, 1, 2, 3, 4, 5, 6 and 7.
Polyphase Motors
Maximum electrical motor horsepower for different NEMA starters for three phase motors can be found in the table below:
| Maximum Horsepower (hp) | ||||||||||
| NEMA Size | NEMA Continuous Amp Rating (Amp) | Full Voltage Starting | Part Winding Starting | Wye Delta Starting | ||||||
| 200V | 230V | 460V 575V | 200V | 230V | 460V 575V | 200V | 230V | 460V 575V | ||
| 00 | 9 | 1 1/2 | 1 1/2 | 2 | ||||||
| 0 | 18 | 3 | 3 | 5 | ||||||
| 1 | 27 | 7.5 | 7.5 | 10 | 10 | 10 | 15 | 10 | 10 | 15 |
| 2 | 45 | 10 | 15 | 25 | 20 | 25 | 40 | 20 | 25 | 40 |
| 3 | 90 | 25 | 30 | 50 | 40 | 50 | 75 | 40 | 50 | 75 |
| 4 | 135 | 40 | 50 | 100 | 75 | 75 | 150 | 60 | 75 | 150 |
| 5 | 270 | 75 | 100 | 200 | 150 | 150 | 350 | 150 | 150 | 300 |
| 6 | 540 | 150 | 200 | 400 | 300 | 600 | 300 | 350 | 700 | |
| 7 | 810 | 300 | 600 | 450 | 900 | 500 | 500 | 1,000 | ||
Ease of selection is a fundamental design advantage of a NEMA-style starter. To select a NEMA starter only horsepower and voltage are needed. NEMA starters have interchangeable heater elements and makes NEMA starters attractive in projects where the motor specification is not known until the start-up date.
Single Phase Motors
Maximum horsepower, full voltage starting, two pole contactors, are indicated below:
| Maximum Horsepower (hp) | ||
| NEMA Size | 115 Volts | 230 Volts |
| 00 | 1/3 | 1 |
| 0 | 1 | 2 |
| 1 | 2 | 3 |
| 2 | 3 | 7.5 |
| 3 | 7.5 | 15 |
- More about NEMA
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Related Topics
- Electrical - Amps and electrical wiring, AWG - wire gauge, electrical formulas, motors and units
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Related Documents
- NEMA - National Electrical Manufacturers Association - National Electrical Manufacturers Association
- NEMA Frame Assignments - NEMA Frame Assignments
- Power and Horsepower in Electrical Motors - Electrical power is rated in Horsepower or Watts
- Variable-Frequency Drives - Heat Loss and Required Ventilation - A variable-frequency drive develops heat loss during work. To avoid overheating it is often necessary to ventilate the location around the frequency-drive
