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:

IEC Electric Motor Duty Cycles
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

  • Electrical

    Electrical units, amps and electrical wiring, wire gauge and AWG, electrical formulas and motors.

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 older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !

Translate this Page

Translate this page to Your Own Language .

About the Engineering ToolBox!

Privacy Policy

We don't collect information from our users. More about

Citation

This page can be cited as

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

Modify the access date according your visit.

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!

Unit Converter

















































9.29.12

Sponsored Links
.