--- title: US Motors Inverter Duty Hazardous Location Motors with AEGIS® description: US Motors Inverter Duty motors for hazardous locations are designed to operate safely in hazardous areas, & without damage from VFD control. image: https://blog.est-aegis.com/hubfs/For%20blogpost.png --- [![Electro Static Technology](https://blog.est-aegis.com/hubfs/raw_assets/public/public/images/electro-static-technology.svg "Electro Static Technology")](https://www.est-aegis.com/) [![Aegis](https://blog.est-aegis.com/hubfs/raw_assets/public/public/images/Aegis.svg "Aegis")](https://www.est-aegis.com/) - [+1 866-738-1857](tel:+1%20866-738-1857) - [Products](https://www.est-aegis.com/products/) - [AEGIS® SGR – for motors under 500 HP/375 kW](https://www.est-aegis.com/product/sgr/) - [AEGIS® uKIT – for common NEMA/IEC frame size](https://www.est-aegis.com/product/sgr-ukit/) - [AEGIS® RPPR – for reactor recirculating pumps](https://www.est-aegis.com/rppr-resources/) - [AEGIS® EV and EVO Rings - for electric vehicles](https://www.est-aegis.com/product/ev-evo-rings/) - [AEGIS® PRO Series – for motors over 300 HP/225 kW](https://www.est-aegis.com/product/pro-series/) - [Shaft Voltage Testing and Accessories](https://www.est-aegis.com/product/mounting-accessories/) - [Online Product Catalog](https://catalog.est-aegis.com/) - [AEGIS® 2-Year Extended Warranty](https://www.est-aegis.com/product/extended-warranty/) - [Applications](https://www.est-aegis.com/applications/) - [Electric Vehicle Solutions](https://www.est-aegis.com/applications/electric-vehicle-solutions/) - [Food & Beverage](https://www.est-aegis.com/applications/food-beverage/) - [HVAC](https://www.est-aegis.com/applications/hvac/) - [Industrial & Chemical](https://www.est-aegis.com/applications/industrial-chemical/) - [Other Industries](https://www.est-aegis.com/applications/other-industries/) - [Power Generation & Renewable Energy](https://www.est-aegis.com/applications/power-generation-renewable-energy/) - [Transportation](https://www.est-aegis.com/applications/transportation/) - [Water Treatment](https://www.est-aegis.com/applications/water-treatment/) - [Bearing Protection](https://www.est-aegis.com/bearing-protection/) - [Shaft Voltage & Bearing Currents](https://www.est-aegis.com/bearing-protection/shaft-voltage-and-bearing-currents/) - [Fluting & Bearing Inspection](https://www.est-aegis.com/bearing-protection/fluting-and-bearing-inspection/) - [Best Practices & Installation](https://www.est-aegis.com/bearing-protection/best-practices-and-installation/) - [Resources](https://www.est-aegis.com/resources/) - [AEGIS® Bearing Protection Handbook](https://www.est-aegis.com/resources/handbook/) - [IEEE-841, Hazardous Locations, & AEGIS®](https://info.est-aegis.com/technical-codes-and-ieee-841-standards) - [Recorded Webinars Library](https://www.est-aegis.com/resources/recorded-webinars/) - [Installation Instructions](https://www.est-aegis.com/resources/installation-instructions/) - [Videos](https://www.est-aegis.com/resources/videos/) - [Technical Papers](https://www.est-aegis.com/resources/technical-papers/) - [Case Studies](https://www.est-aegis.com/resources/case-studies/) - [Specifying AEGIS®](https://www.est-aegis.com/resources/specifying-aegis/) - [Request Training](https://www.est-aegis.com/resources/training/) - [Product Sheets](https://www.est-aegis.com/resources/product-sheets/) - [About](https://www.est-aegis.com/about/) - [News](https://blog.est-aegis.com/) - [Tradeshows](https://www.est-aegis.com/about/tradeshows/) - [Blog](https://blog.est-aegis.com/) - [Where to Buy](https://www.est-aegis.com/where-to-buy/) - [Distributors](https://www.est-aegis.com/where-to-buy/distributors?type=Distributor) - [Trained Installers](https://www.est-aegis.com/where-to-buy/installers?type=Installer) - [Explosion Proof Installers](https://www.est-aegis.com/where-to-buy/installers?type=Explosion%20Proof%20Installer) - [Motors & Seals with AEGIS® Installed](https://www.est-aegis.com/where-to-buy/oems-with-aegis/) [Contact Us](https://www.est-aegis.com/contact/) - [+1 866-738-1857](tel:+1%20866-738-1857) # US Motors Inverter Duty Hazardous Location Motors with AEGIS® [Home](https://www.est-aegis.com/) » [Blog](https://blog.est-aegis.com/) » US Motors Inverter Duty Hazardous Location Motors with AEGIS® [AEGIS](https://blog.est-aegis.com/author/estaegis) Dec 13, 2021 U.S. MOTORS® hazardous location motors are designed for use on pumps, compressors, fans, conveyors and tools in potentially explosive environments. These motors are built to prevent ignition outside the motor by containing sparks, flashing, and explosions inside the motor casing.  They are ideal for many applications in oil and gas, industrial paint and coating, and grain processing operations, to name just a few. ![For blogpost](https://blog.est-aegis.com/hs-fs/hubfs/For%20blogpost.png?width=300&name=For%20blogpost.png)US Motors hazardous location motors are all NEMA Premium® Efficiency with a 1.0 or 1.15 service factor, and meet other NEMA standard requirements.  For variable frequency drives, there are also lines of hazardous location Inverter Duty motors.  Inverter Duty motors include protection against the side effects of VFD control: electrical damage to the stator windings and bearings. So Inverter Duty US Motors include an Inverter Grade® insulation system to protect the windings.  That is, additional phase paper between coils, extra bracing on end turns, and Insulife 2000 insulation treatment. The bearings are protected by an internal AEGIS® Shaft Grounding Ring. Larger motors, over 400 NEMA frame, also have bearing insulation at the non-drive end. With all of these protections in place, US Motors Inverter Duty hazardous location motors are prepared to run safely AND reliably wherever they're installed. The factory-installed AEGIS Rings also come with a [2-year extended warranty](https://www.est-aegis.com/product/extended-warranty/) against bearing fluting damage. No other form of protection against VFD-caused bearing damage offers a warranty like this. [![2-Year Extended Warranty](https://no-cache.hubspot.com/cta/default/20974229/3b258d08-3058-4c7f-a866-2991b627f2e0.png)](https://cta-redirect.hubspot.com/cta/redirect/20974229/3b258d08-3058-4c7f-a866-2991b627f2e0) [![](https://blog.est-aegis.com/hs-fs/hubfs/Imported_Blog_Media/webinar-icon-Dec-22-2021-03-25-23-31-PM.png?width=75&name=webinar-icon-Dec-22-2021-03-25-23-31-PM.png)](https://est-aegis.com/training)To learn more about AEGIS shaft grounding and best practices for electrical bearing protection, [sign up for a training](https://www.est-aegis.com/resources/training/). We offer monthly live training webinars, and we can also visit your facility to review your exact application. [![Sign Up For Training](https://no-cache.hubspot.com/cta/default/20974229/69dd56c7-bbd1-4ad0-ae5c-29de322039f0.png)](https://cta-redirect.hubspot.com/cta/redirect/20974229/69dd56c7-bbd1-4ad0-ae5c-29de322039f0) [Motors on VFD](https://blog.est-aegis.com/tag/motors) ### Subscribe To Our Blog ## Read On ### [Electrical Bearing Protection for Motors in Hazardous Locations](https://blog.est-aegis.com/electrical-bearing-protection-for-hazardous-duty-motors?hsLang=en-us) All electric motors controlled by variable frequency drives are at risk of electrical bearing... ### [Explosion Proof Motors Available with AEGIS Shaft Grounding Rings](https://blog.est-aegis.com/explosion-proof-motors-with-aegis-shaft-grounding-rings?hsLang=en-us) Not just any off-the-shelf motor can safely run in a potentially explosive atmosphere. Explosion... ### [Changing Standards: Shaft Grounding in IEEE-841 Motors & Hazardous Locations](https://blog.est-aegis.com/changing-standards-shaft-grounding-in-ieee-841-motors-hazardous-locations?hsLang=en-us) Shaft grounding for VFD-fed electric motors has largely been disallowed in "Classified"... 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