Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

Search is the most efficient way to navigate the Engineering ToolBox!

Nema Starters

Sponsored Links

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:

For full table - rotate the screen!

Nema Starters - Maximum Horsepower (hp)
NEMA SizeNEMA Continuous Amp Rating
(amps)
Full Voltage StartingPart Winding StartingWye Delta Starting
200V230V460V 575V200V230V460V 575V200V230V460V 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 1000

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 with full voltage starting and two pole contactors are indicated below:

Nema Starters - Maximum Horsepower (hp)
NEMA Size115 volts230 volts
00 1/3 1
0 1 2
1 2 3
2 3 7.5
3 7.5 15
Sponsored Links

Related Topics

Electrical

Electrical engineering with units, amps and electrical wiring. Wire gauges, electrical formulas, motors and more.

Related Documents

Electrical Motors - Frame Dimensions

Electrical motors NEMA frame dimensions.

Electrical Motors - NEMA Frame Assignments

NEMA frame assignments.

Electrical Motors - Shaft Power vs. Voltage and Current

Calculate electric motors shaft power.

Electrical Motors Efficiency Ratings

NEMA - electrical motor efficiency ratings.

NEC - National Electrical Code

National Electrical Code.

NEMA - National Electrical Manufacturers Association

National Electrical Manufacturers Association.

Variable Frequency Drives - Heat Loss and Required Air Cooling

Avoid overheated variable frequency drives with adequate ventilation.

Sponsored Links

Search Engineering ToolBox

Search is the most efficient way to navigate the Engineering ToolBox!

SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics on the AMP pages. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.