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Medium-voltage motor control systems

Ampgard medium-voltage motor control (2.5, 5.0, 7.2 kV)

Ampgard medium-voltage starters are the premier solution in motor control, performance, reliability and protection. Eaton offers a complete line of full voltage and reduced voltage starter types. This broad selection of medium-voltage control supports a wide range of industrial applications including pulp and paper, water and wastewater, oil and gas and HVAC.

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See Eaton's medium-voltage motor control portfolio Learn about medium-voltage motor control fundamentals
Voltage Class
2.4 kV
5 kV
7.2 kV
Horsepower
up to 3000 Hp
up to 5000 Hp
up to 8000 Hp
Main Bus Rating
up to 3000 A

Core features

  • Designed and tested to meet UL 347
  • Available with arc-resistant enclosures that comply with IEEE Standard C37.20.7-2017
  • Outfitted with Eaton’s Type SL vacuum contactors - the industry’s highest interrupting ratings
  • Proven durability with a long-life isolation switch rated for 10,000 mechanical operations
  • Top-mounted main bus for convenient installation and maintenance
  • Starter types include full voltage non-reversing (FVNR), reduced voltage reactor (RVR), reduced voltage autotransformer (RVAT) and reduced voltage solid state soft starter (RVSS)
  • Available with Eaton EMR series of motor protection relays for comprehensive and safe motor monitoring and starting control   
  • Completely front accessible
  • Two-high 400 A and one-high 800 A starter configurations

View design guide (layouts, technical data and application information)

Download guide spec (26 18 39)

Learn more about power system design basics

Key features of our Ampgard RVSS

Learn more about our Ampgard reduced voltage soft starter (RVSS), the first UL 347 medium-duty rated soft starter in the market.

Learn more

Image gallery

View images of Ampgard 7.2 kV medium-voltage motor control

Ampgard RVSS open doors
800A starter showing internal components
400A starter showing internal components
Main (lower) and variable frequency (upper) buses
800A bypass and motor select starters with double bus
Low voltage control door with Eaton EMR3000 protective relay
Ampgard lineup with double bus close coupled to SC9000EP drive
400A and 800A starters installed
Low voltage control panel and door
Main breaker bus connected to 2-high Ampgard
Ampgard remote operator installed on 400A starter
400A SL vacuum contactor with bolted connections
Ampgard lineup with incoming line, 2-high 400A, and 800A sections
Potential transformer disconnect switch
4160V stand-alone reactor starter
1200A manually operated load break switch

See Eaton's full medium-voltage control assemblies portfolio

Medium-voltage control assemblies portfolio – Ampgard & SC9000 Drives

Want to learn more?

Watch this video to learn more about Ampgard AR, the next generation of arc-resistant medium-voltage motor control.

Take control of your motors

Ampgard reduced voltage soft starter (RVSS) is designed to prevent mechanical shock, current spikes and voltage drops with a full suite of programmable settings. Featuring an exclusive pre-start check and UL-347 medium duty ratings, the RVSS seamlessly integrates into Eaton’s Ampgard SC9000 drives and medium-volage switchgear lineups.
Learn more

Ampgard, the name motor applications rely on

Eaton has been an industry leader for more than 50 years, providing UL 347 certified medium-voltage control. When it comes to controlling and protecting medium-voltage motors, the Ampgard family is the premier high-performance choice.
Learn more

Money saving double-bus design

When close-coupling Ampgard starters with medium-voltage drives for synchronous transfer applications the double bus eliminates external cables and associated accessories required to connect motor-select and bypass starters. Material and labor savings can be upwards of $25,000 for a four-motor system.
Learn more

Remote operator for enhanced safety

The Ampgard Remote Operator (ARO) for the starter isolation switch when mounted on the front of the starter allows personnel to safely open and close the switch from outside the arc flash boundary.
View brochure

Integrated control gear streamlines multi-configuration lineups

Combine Eaton’s Ampgard motor starters with SC9000 medium-voltage drives across a common bus into a compact and economical integrated assembly.

Eaton is here to help

Did you know Eaton provides 24-7 technical support for your medium-voltage motor controls?
Learn more

Related products

Specifications

View design guide (layouts, technical data and application information)

Download guide spec (26 18 39)

Learn more about power system design basics

Ratings

POWER RATING 50-8000 Hp
INPUT VOLTAGE RATING 2400-6900 V
BASIC IMPULSE LEVEL (BIL) 60 kV BIL
INTERRUPTING RATING 50 kA rms symmetrical
AMBIENT TEMPERATURE 0 to 40 degrees C

Standards

UL                                                                                        347
NEMA ICS3
CSA 22.2 no. 253-16
THIRD PARTY RECOGNITION/APPROVAL UL/cUL available for most configurations
SEISMIC QUALIFICATION IBC

Enclosure

ENCLOSURE TYPE                                                                                         
 NEMA 1, NEMA 12, NEMA 3R
ACCESSIBILITY
 Front                                                                  
INDOOR SECTION DIMENSIONS (TYPICAL)
 36"w x 30"d x 92"h
BUS INSULATION Uninsulated is standard, heat shrink sleeve is optional
BUS SUPPORTS Glass polyester

DEVICES

SWITCHING DEVICE                                           
 Vacuum contactor (400 A / 800 A)
CONTACTOR CONNECTION
 Bolted is standard, stab-in is optional
FUSE MOUNTING Bolted is standard, clip-in is optional
Download Links
  • 7.2 kV Motor Control (Ampgard), medium-voltage design guide
    This design guide provides dimensions, layout examples, technical specifications and application information for medium-voltage 7.2 kV Motor Controls (Ampgard). The information in this document supersedes section 10 of the Consulting Application Guide (CAG).
    (PDF 2 MB , 11/05/2025) Updated
    Download
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