Power Back


Temporary Power Restoration Device
Auto Transformers restores missing hot leg (or neutral) in either 120/240V or 120/208V 3-wire services

TRIDENT Carry In MODULAR Design 10kVA(9lb+45) lbs. or 20kVA (9+45+45)lbs.

15 KVA 91lbs. or 20kVA 110lbs.

POWER BACK 15 kVA 120lbs. or 20kVA 140lbs.

POWER BACK 30 kVA 220lbs.

POWER BACK 50 kVA 295lb

Why Utility Companies use our Temporary Power Restoration Devices.

  • Power-Back Temporary Service Restoration Autotransformers. It saves time and money,
  • Now you can restore lost power in minutes and schedule permanent repairs at a later date instead of having to make repairs immediately
  • They are designed for both overhead 120/240 and underground 120/240 3 wire systems.
  • Restores Power to Both Homes and Businesses.

Early models of transportable autotransformers were heavy, weighing in between 250 and 400 lbs. Unloading and loading back on the truck required a hoist, and they often took two persons to move in place at the meter pan.

Bridgeport Magnetics specializes in toroidal transformers that are much lighter and smaller than traditional E-I models. For example, when we introduced our Power-Back series in 2008, it came out 40-50% lighter than the competition.

2006 to 2021 Power-Back models featuring sturdy stainless enclosures and wide 10” wheels now reside countrywide on power utility depots and trucks. GPS tracking systems are available to follow deployment and ensure recovery after line repairs. In addition, two larger wheeled models rated 30KVA and 50KVA are designed for multi-service use in condominium communities.

At Bridgeport Magnetics, development never ceases. In the fall of 2021 we are introducing two additional Power Back models, both featuring non-metallic enclosures that do not require connection to the customer’s ground or a driven ground rod.

  • The 20KVA PB-LIGHT features an aluminum wheeled base. At only 110 lbs. and a low center of gravity, it is even easier to handle in rugged terrain and in the deep of winter.
  • The 10/20 KVA TRIDENT. A carry-in model. Features three individual components: Two 10KVA transformers and a control unit that attaches directly to the meter pan. At 45 lbs. the plug-in transformers comply with union regulations allowing 60lb. max carry weight. Trident is compact and can reside on a light truck or even in a car trunk for immediate use. In addition, the all-resin enclosures do not require grounding


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TRIDENT Flex Carry In

(does not require grounding)

Recommended Service



Number of 10kVA




Auto Transformer KVA


20 (2*10kVA)

Circuit Breaker Amp


2 x 63

Meter Adapter Amp



Input/Output Voltmeters



Hour Counter (hours in use)



Enclosure (non-metallic)

ABS resin

ABS resin

Weight (lbs.)


46 + 38

TRIDENT Flex Carry In (does not require grounding) can restore a lost Phase or Neutral in households with up to 200 Amp service by means of one or two identical 10KVA autotransformers, each weighing 46 lbs. and a control unit integrated with a plug-in meter adapter (8lbs). 

Each autotransformer is controlled by an individual circuit breaker enabling two output power selections.

The transformers feature a carrying handle and means for holding the cable and plug in place when not in use. They fit easily on a light truck or in a car trunk and are carried in to be placed on the ground below the residence meter pan.

The toroidal autotransformers are encapsulated in a cup shaped enclosure molded from high-strength flame rated ABS polymer. The same resin is used in the control unit enclosure rendering all surfaces non-conducting.

The non-metallic enclosures do not require grounding to a driven spear or residence ground for personal safety.

Huntsville UtilitiesAlabama
ENMAX, Calgary Alberta CAAlberta, CA
Arizona Public ServiceArizona
North Little Rock Electric DepartmentArkansas
City of Azusa, CACalifornia
Pacific Gas & ElectricCalifornia
City of Gunnison COColorado
San Miguel Power Assn, Inc.Colorado
Xcel EnergyColorado, Minnesota, Wisconsin
Delaware Electric CoopDelaware
Delmarva Power & Light CODelaware, Maryland, Virginia
Florida Power & Light CompanyFlorida
Cobbs EMCGeorgia
Georgia PowerGeorgia
Jackson Electric Membership CorporationGeorgia
City Of Weiser, IdahoIdaho
Commonwealth EdisonIllinois
Anderson Municipal Light Power AMLPIndiana
Indianapolis Power & LightIndiana
Indiana Michigan Power CompanyIndiana,Michigan
Alliant Energy (Interstate Power & Light)Iowa
Mid-American Energy CompanyIowa
Traer Municipality PowerIowa
Jackson EnergyKentucky
Choptank ElectricMaryland
Eversource UtilitiesMass, Connecticut, New Hampshire
DTE EnergyMichigan
City Of North St Paul MinMinnesota
Minnesota PowerMinnesota
Alexandria Power and LightMinnesota
Mississippi County Electric CooperativeMississippi
Co-Mo Electric Coop, Inc.Missouri
Northwestern Energy LLCMontana
Jersey Central Power and LightNew Jersey
Con EdisonNew York
New York State Electric & Gas CorporationNew York
PSE&GNew York, New Jersey
Edgecombe-Martin EMCNorth Carolina
American Electric PowerOhio, Michigan, Indiana
Salem ElectricOregon
City Of Ashland OROregon
Consumer Power Inc.Oregon
Emerald Peoples Utility DistrictOregon
Portland General ElectricOregon
Northwest Rural Electric Cooperative Pennsylvania
PPL ElectricPennsylvania
Aiken Electric Co-OpSouth Carolina
Blue Ridge Electric CooperativeSouth Carolina
South Carolina Gas & ElectricSouth Carolina
Cleveland UtilitiesTennessee
Volunteer Energy CooperativeTennessee
Price City UtilitiesUtah
Community Electric CooperativeVirginia
Dominion Virginia PowerVirginia
Southside Electric CooperativeVirginia
Appalachian Power CompanyVirginia
Avista Utilities CorpWashington
Franklin County PUDWashington
Kattitas PUDWashington
Peninsula Light Company WAWashington
Puget Sound EnergyWashington
Tacoma Power UtilitiesWashington
City of Stoughton UtilitiesWisconsin
Northwestern Wisconsin Electric CompanyWisconsin


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