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Definition: NEMA Motor Starters


NEMA 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, 7

Unlike IEC starters, most NEMA starters use heater-based overload relays, but this is not required by the standard. Compared to the IEC rating system, NEMA starters are much more conservatively rated, and are thus preferred by most factories in the United States. However, the NEMA starters are also substantially more expensive than the equivalently rated IEC starter.

Select a size starter for horsepower and amperage ratings. 00, 0, 1, 2, 3, 4, 5, 6, 7


Size 00

NEMA Continuous Amp Rating = 9 A

200 VAC Horsepower = 1.5 HP

230 VAC Horsepower = 1.5 HP

460/575 VAC Horsepower = 2 HP

Top | 00, 0, 1, 2, 3, 4, 5, 6, 7


Size 0

NEMA Continuous Amp Rating = 18 A

200 VAC Horsepower = 3 HP

230 VAC Horsepower = 3 HP

460/575 VAC Horsepower = 5 HP

Top | 00, 0, 1, 2, 3, 4, 5, 6, 7


Size 1

NEMA Continuous Amp Rating = 27 A

200 VAC Horsepower = 7.5 HP

230 VAC Horsepower = 7.5 HP

460/575 VAC Horsepower = 10 HP

Top | 00, 0, 1, 2, 3, 4, 5, 6, 7


Size 2

NEMA Continuous Amp Rating = 45 A

200 VAC Horsepower = 10 HP

230 VAC Horsepower = 15 HP

460/575 VAC Horsepower = 25 HP

Top | 00, 0, 1, 2, 3, 4, 5, 6, 7


Size 3

NEMA Continuous Amp Rating = 90 A

200 VAC Horsepower = 25 HP

230 VAC Horsepower = 30 HP

460/575 VAC Horsepower = 50 HP

Top | 00, 0, 1, 2, 3, 4, 5, 6, 7


Size 4

NEMA Continuous Amp Rating = 135 A

200 VAC Horsepower = 40 HP

230 VAC Horsepower = 50 HP

460/575 VAC Horsepower = 100 HP

Top | 00, 0, 1, 2, 3, 4, 5, 6, 7


Size 5

NEMA Continuous Amp Rating = 270 A

200 VAC Horsepower = 75 HP

230 VAC Horsepower = 100 HP

460/575 VAC Horsepower = 200 HP

Top | 00, 0, 1, 2, 3, 4, 5, 6, 7


Size 6

NEMA Continuous Amp Rating = 540 A

200 VAC Horsepower = 150 HP

230 VAC Horsepower = 200 HP

460/575 VAC Horsepower = 400 HP

Top | 00, 0, 1, 2, 3, 4, 5, 6, 7


Size 7

NEMA Continuous Amp Rating = 810 A

230 VAC Horsepower = 300 HP

460/575 VAC Horsepower = 600 HP

Top | 00, 0, 1, 2, 3, 4, 5, 6, 7


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