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

Ampgard AR arc-resistant medium-voltage motor control is certified to IEEE Std. C37.20.7-2017 and is designed to safely contain and redirect exhaust gases away from the operator in the event of an arc flash incident. Ampgard AR is rated arc-resistant Type 2B enhancing safety from the front, sides and rear of the enclosure, even with the low-voltage control doors open. The robust construction of the Ampgard AR is designed to resist the forces of an arc fault up to 50 kA for a full 0.5 seconds.

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Voltage Class
7.2 kV
Horsepower
up to 8000 Hp
Main Bus Rating
up to 3000 A

Core features

  • Designed and tested to meet UL 347
  • Third party tested and verified arc-resistant to IEEE C37.20.7-2017
  • Includes Eaton’s Type SL vacuum contactors with the industry’s highest interrupting ratings
  • Proven durability with a long-life isolation switch rated for 10,000 mechanical operations
  • Completely front accessible
  • Top-mounted main bus for convenient installation and maintenance
  • Two-high 400 A and one-high 800 A starter configurations
  • 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

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

Download guide spec (26 18 39 01)

Learn more about power system design basics

Image gallery

View images of Ampgard 7.2 kV arc-resistant medium-voltage motor control

4160 V / 400 A MV4S solid-state soft starter, shown in non-arc enclosure
400 A starter showing internal components
Main (lower) and variable frequency (upper) buses
Incoming cable section and 800 A arc resistant starter (shown without plenum)
800 A starter showing internal components
800 A main contactor
Incoming cable section with 800 A motor select and 800 A bypass starter
400 A SL vacuum contactor with bolted connections
Low voltage control compartment

Safer by design.

Unique isolation switch design disconnects the starter from the medium-voltage source in the rear arc chamber instead of the front so that in the event of an arc fault, the pressure produced would be directed toward the back of the equipment for greater safety.

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.
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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.

Remote operator for enhanced safety

The Ampgard Remote Operator (ARO) for the starter isolation switch that, when mounted on the front of the starter allows personnel to safely open and close the switch from outside the arc flash boundary.
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Integrated control gear streamlines multi-configuration lineups

Compact and economical solution combining Eaton’s Ampgard main breaker and motor starters with the SC9000 medium-voltage drive across a common bus in a single high quality, integrated assembly. Entire assembly is available as arc-resistant.
Specifications

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

Download guide spec (26 18 39 01)

Learn more about power system design basics

Ratings

POWER RATING 50-5000 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 C22.2
THIRD PARTY RECOGNITION/APPROVAL UL/cUL available for most configurations
SEISMIC QUALIFICATION IBC

Enclosure

ENCLOSURE TYPE
 Arc resistant
ACCESSIBILITY
 Front
INDOOR SECTION DIMENSIONS (TYPICAL)
 36"w x 50"d x 128"h
BUS INSULATION Heat shrink sleeve
BUS SUPPORTS Glass polyester

DEVICES

SWITCHING DEVICE
 Vacuum contactor (400A / 800A)
CONTACTOR CONNECTION
 Bolted is standard, stab is optional
FUSE MOUNTING Bolted
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Eaton is an intelligent power management company dedicated to improving the quality of life and protecting the environment for people everywhere. We are guided by our commitment to do business right, to operate sustainably and to help our customers manage power ─ today and well into the future. By capitalizing on the global growth trends of electrification and digitalization, we’re accelerating the planet’s transition to renewable energy and helping to solve the world’s most urgent power management challenges.
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