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.

Nema Starters

Nema sized contactors or 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!

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:

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

Related Documents

Sponsored Links

Share

Search Engineering ToolBox

  • 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. 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.

Topics

Unit Converters

Temperature

oC
oF


Load Calculator!

Length

m
km
in
ft
yards
miles
naut miles


Load Calculator!

Area

m2
km2
in2
ft2
miles2
acres


Load Calculator!

Volume

m3
liters
in3
ft3
us gal


Load Calculator!

Weight

kgf
N
lbf


Load Calculator!

Velocity

m/s
km/h
ft/min
ft/s
mph
knots


Load Calculator!

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O


Load Calculator!

Flow

m3/s
m3/h
US gpm
cfm


Load Calculator!

11 15

This website use cookies. By continuing to browse you are agreeing to our use of cookies! Learn more