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

IEC Electric Motor Duty Cycles

The eight - S1 - S8 - IEC duty cycles of operating electrical motors.

Sponsored Links

IEC (the International Electrotechnical Commission) uses eight duty cycle designations to describe electrical motors operating conditions:

S1 Continuous duty The motor works at a constant load for enough time to reach temperature equilibrium.
S2 Short-time duty The motor works at a constant load, but not long enough to reach temperature equilibrium. The rest periods are long enough for the motor to reach ambient temperature.
S3 Intermittent periodic duty Sequential, identical run and rest cycles with constant load. Temperature equilibrium is never reached. Starting current has little effect on temperature rise.
S4 Intermittent periodic duty with starting Sequential, identical start, run and rest cycles with constant load. Temperature equilibrium is not reached, but starting current affects temperature rise.
S5 Intermittent periodic duty with electric braking Sequential, identical cycles of starting, running at constant load and running with no load. No rest periods.
S6 Continuous operation with intermittent load Sequential, identical cycles of running with constant load and running with no load. No rest periods.
S7 Continuous operation with electric braking Sequential identical cycles of starting, running at constant load and electric braking. No rest periods.
S8 Continuous operation with periodic changes in load and speed Sequential, identical duty cycles run at constant load and given speed, then run at other constant loads and speeds. No rest periods.
Sponsored Links

Related Topics

Related Documents

Sponsored Links

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

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 Pro Sketchup Extension Warehouse!

Translate
About the Engineering ToolBox!

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.

Citation

This page can be cited as

  • Engineering ToolBox, (2004). IEC Electric Motor Duty Cycles. [online] Available at: https://www.engineeringtoolbox.com/iec-duty-cucles-d_739.html [Accessed Day Mo. Year].

Modify access date.

. .

close

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Scientific Online Calculator

Scientific Calculator

3 10

Sponsored Links
.