Nema Starters

Reference data and engineering information about nema starters for miscellaneous applications.

nemastarters

Overview

Engineering reference data for Nema Starters in miscellaneous.

Key Formulas

Unit Conversion

$y = x \cdot k$

Multiply by conversion factor.

Linear Interpolation

$y = y_1 + \frac{(x - x_1)(y_2 - y_1)}{x_2 - x_1}$

Estimate between two known points.

Percentage

$p = \frac{\text{part}}{\text{whole}} \times 100\%$

Part as fraction of whole.

Variables

Symbol	Description	Unit
$x$	Input value	—
$y$	Output value	—
$k$	Conversion factor	—

Maximum motor horsepower ratings for polyphase (three-phase) motors by NEMA starter size, voltage, and starting method.
NEMA Size	Continuous Amps(A)	Full Voltage @ 200V(hp)	Full Voltage @ 230V(hp)	Full Voltage @ 460/575V(hp)	Part Winding @ 200V(hp)	Part Winding @ 230V(hp)	Part Winding @ 460/575V(hp)	Wye Delta @ 200V(hp)	Wye Delta @ 230V(hp)	Wye Delta @ 460/575V(hp)
00	9	1.5	1.5	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

Maximum motor horsepower ratings for single-phase motors using full voltage starting.
NEMA Size	115 Volts(hp)	230 Volts(hp)
00	0.333	1
0	1	2
1	2	3
2	3	7.5
3	7.5	15

Starter Selection Criteria

Selecting a NEMA starter is straightforward and requires only two motor specifications:

Motor Horsepower (hp)
Motor Voltage (V)

A key practical advantage of NEMA starters is the use of interchangeable heater elements. This feature makes them particularly suitable for projects where the final motor specifications may not be confirmed until the installation or startup phase.

Interactive Charts

Electrical Motors - Shaft Power vs. Voltage and Current

Maximum motor horsepower ratings for single-phase motors using full voltage starting.

References

Original Source

Source: engineeringtoolbox.com