__
PowerBack Temporary Power Restoration
At Bridgeport Magnetics Group, we help utility companies and linemen restore power faster with PowerBack temporary power restoration autotransformers. Our toroidal units deliver reliable balanced 120/240V or 120/208V service in minutes, combining superior portability, high-efficiency design, rugged construction, and uncompromising reliability for demanding field conditions.
Power Restored at the Meter in Minutes
PowerBack temporary power restoration autotransformers regenerate a missing hot leg or neutral directly at the meter socket—restoring full service in minutes instead of days. Designed by linemen, for linemen in close collaboration with utilities, every PowerBack unit is manufactured in Shelton, Connecticut with a fast 1–2 week lead time.
Built with high-efficiency toroidal cores for lighter weight and easier one-person deployment, Service Savor features a single-turn meter adapter, built-in voltage and amperage monitoring, and redundant 2× trip overcurrent protection for safe, confident field use. Whether you need the maneuverable PowerBack Lite models or higher-capacity wheeled units, Service Savor gives your crews the speed and reliability they need on every call.
Our Customers
Power-Back & Trident Models
Compare ratings, enclosures, and features across the lineup.
| Trident | Powerback-Lite 15KVA | Powerback-Lite 20KVA | Powerback 15K-M | Powerback 20K-M | Powerback 30K-M | Powerback 50K-M | |
|---|---|---|---|---|---|---|---|
|
|
|
|
|
|
|
|
| High Efficiency Toroidal Auto Transformer | 20kVA (2x10kVA) | 15kVA | 20kVA | 15kVA | 20kVA | 30kVA | 50kVA |
| Recommended Service | 100A (one xfrm) 200A (two xfrm) | 150A | 200A | 150A | 200A | 320A | 400A |
| Circuit Breaker | 2x63A | 125A | 160A | 125A | 160A | 250A | 400A |
| Shunt Trip Temp. deg. C | NA | 105 | 105 | 105 | 105 | 105 | 105 |
| Corded Meter Adapter Included | 200A | 200A | 200A | 200A | 200A | 320A | AWG 1 cables with CAM-Lock Connectors + 9 Cables Hkit |
| Input/Output Voltmeters | Yes | Yes | Yes | Yes | Yes | Yes | NA |
| Integrated GFI with Defeat Switch | Optional | Optional | Optional | Optional | Optional | Optional | NA |
| GPS Tracking | Optional | Optional | Optional | Optional | Optional | Optional | Optional |
| Enclosure Type | Resin Case | Resin Case | Resin Case | NEMA 4 Stainless | NEMA 4 Stainless | NEMA 4 Stainless | NEMA 4 Yellow |
| Grounding | No Grounding Required | No Grounding Required | No Grounding Required | YES | YES | YES | YES |
| Dimensions (inches) | NA | 29 x 22 x 13 | 29 x 22 x 13 | 29 x 22 x 13 | 46 x 28 x 22 | 46 x 35 x 20 | 46 x 35 x 20 |
| Wheels (Diameter x Width) | NA | 10.5" x 3" | 10.5" x 3" | 10.5" x 3" | 10.5" x 3" | 12" x 4.5" | 12" x 4.5" |
| Weight (lbs.) | 46 + 38 | 91 | 110 | 120 | 140 | 220 | 290 |
The Powerback was engineered with US Utilities - light & easy to maneuver, single-turn meter adapter, redundant overcurrent protection and built-in monitoring reliability - designed by lineman, for lineman
Light & Easy to Maneuver
A toroidal core makes Power-Back dramatically lighter than conventional E-I lamination units, so a single lineman can position it at the meter pan without a hoist or a second set of hands.
Single-turn Meter Adapter
Connect at the meter in one turn. The Power-Back meter adapter installs fast and includes a neutral – so you restore service in minutes instead of running temporary above-ground conductors.
Never-flat Tires
Airless tires designed for rugged deployments
2x Trip Protection
A built-in 2× overcurrent trip safeguards the unit and the service during temporary restoration – safety engineered in, not bolted on.
Made in USA: 1-2 wk leadtime
Every Power-Back is Manufactured in Shelton, Connecticut, with a 1–2 week lead time. No import delays.
When a Single Leg Fails, Don't Leave Customers in the Dark
An open hot leg or neutral – from a storm, damaged underground cable, or equipment fault – can drop a customer’s 120/240V service even when the upstream transformer is fine. Locating and repairing the fault often takes days.
PowerBack temporary power restoration autotransformers (also known in the industry as add-a-phase or service-saver devices) solve this by connecting directly between the meter socket and the meter. This Service Savor quickly regenerates the missing leg, restoring full balanced service immediately.
PowerBack restores load current on an open hot leg up to its rated capacity and full service on an open neutral up to its neutral current rating – giving your crews valuable time to schedule the permanent repair on their own timeline.
Back online in days, not weeks.
Power-Back and Trident temporary power restoration autotransformers – developed hand-in-hand with utility line crews, engineered and built in Shelton, Connecticut.
Frequently Asked Questions
What is PowerBack?
PowerBack is Bridgeport Magnetics’ premium line of temporary power restoration autotransformers, widely recognized in the utility industry as add-a-phase, service-saver, or Servisavor-style devices. These high-efficiency toroidal units connect at the customer meter socket to quickly regenerate a missing hot leg or neutral on single-phase 120/240V or 120/208V services. By restoring full balanced power in minutes, this service savor allows utilities to keep customers online while scheduling permanent underground cable repairs on their own timeline, significantly improving outage response times and customer satisfaction.
How does this Add-a-Phase connect to the service?
PowerBack installs quickly and easily using its single-turn meter adapter (with integrated neutral). Simply remove the customer meter, plug in the PowerBack adapter, and reinstall the meter. No temporary overhead conductors are needed, allowing a single lineman to restore service at the meter pan in minutes.
What is the difference between PowerBack and Trident?
Service Savor wheeled models (including the lightweight PowerBack Lite series) are designed for easy rolling access on driveways, paved areas, and standard job sites. They offer excellent maneuverability with never-flat tires and higher capacity options. The Trident modular system, by contrast, breaks down into lighter hand-carry components (approximately 45 lb per transformer plus control unit), making it the best choice for rough terrain, backyards, flooded areas, or locations where wheeling a full unit is impractical. Both families use the same advanced toroidal technology and were engineered hand-in-hand with working line crews.
Can this Service Savor restore an open neutral as well as an open hot leg?
Yes. This service Savor effectively restores load current on an open hot leg up to its full kVA rating. On an open neutral condition, it restores stable, full balanced service up to its neutral current rating. However, the unit cannot simultaneously correct both a missing hot leg and a missing neutral on the same service. Crews should always verify good conductors before deployment following standard utility procedures.
What safety and monitoring features does PowerBack include?
Every Servisavor unit comes equipped with built-in voltage and amperage monitoring so field crews can instantly verify that proper service voltage has been restored. It also features redundant 2× overcurrent trip protection (in addition to thermal safeguards), providing an extra margin of safety during temporary restoration. These engineered-in protections help safeguard both the unit and customer equipment, reducing risk compared to basic or add-on safety solutions found on some competitive temporary power restoration devices.
Are these Service Savor units made in the USA and what is the lead time?
Yes – every PowerBack autotransformer is designed, wound, and assembled in our Shelton, Connecticut facility. Typical lead time is just 1–2 weeks with no import delays, giving utilities fast access to reliable domestic equipment.
What sizes and capacities are available in the PowerBack line?
The Wheeled Service Savor family includes models from 15 kVA (suitable for 150A services) up to 50 kVA (ideal for multi-home or larger commercial restorations). Popular options include the PowerBack Lite 15kVA and 20kVA for everyday residential use, plus higher-capacity wheeled units (20K-M, 30K-M, and 50K-M). This wide range allows utilities to match the right Service Savor solution to specific service requirements and site conditions.
How does PowerBack compare to traditional Servisavor or SNC Restore-Lite units?
PowerBack stands out with its high-efficiency toroidal core design, which makes the units significantly lighter and more portable than many conventional E-I core alternatives like the Von Servisavor or SNC Restore-Lite. Additional advantages include the single-turn meter adapter for faster installs, never-flat tires, and built-in 2× trip protection with monitoring. Many utilities choose the BMG Service Savor for the combination of one-person deployment, rapid U.S. availability, and long-term reliability in demanding field conditions. For a detailed side-by-side comparison, see our Servisavor alternatives guide.
