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Trident Service Saver
At Bridgeport Magnetics Group, we help utility companies and linemen restore power faster with the Trident Service Saver. Our modular toroidal autotransformers deliver reliable balanced 120/240V or 120/208V service in minutes - combining ultra-light one-person portability, high-efficiency design, and rugged field-ready construction for the most demanding conditions.
Power Restored at the Meter in Minutes
Trident Service Saver 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 Trident unit is manufactured in Shelton, Connecticut with a fast 1–2 week lead time.
Built with high-efficiency toroidal cores, the Trident Service Saver is engineered for maximum portability. Its modular design lets a single lineman carry and deploy the system in backyards, easements, and rough terrain where wheeled units can’t go. The system features a single-turn meter adapter, built-in voltage and amperage monitoring, and redundant 2× trip overcurrent protection for safe, confident field use. Whether restoring a 100 A service with one 10 kVA unit or scaling to 200 A with two units, the Trident Service Saver 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 | |
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| 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 |
When wheeling a cart isnt an option - rough terrain, flooded ground, easements, backyards - the Trident goes where a wheeled unit can't.
Lightest Weight on the Market
The first handheld modular toroidal restoration unit at <50lb weight – purpose-built with line crews and Unions with strict weight restrictions
Modular & Hand-Carried
~45 lb per transformer plus a 9 lb control unit. Built for easements, backyards, gravel, and flooded ground – restore service where wheeling is impossible.
Weatherproof Casing
A new weatherproof enclosure protects the unit through restoration in any conditions.
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.
Made in USA: 1-2 wk leadtime
Every Trident 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 the Trident Service Saver?
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 the Trident Service Saver connect to the service?
The Trident Service Saver is a modular temporary power restoration autotransformer — also known in the industry as an add-a-phase or service-saver unit. It regenerates a missing hot leg or neutral on a single-phase 120/240V or 120/208V service. The system connects at the meter socket and quickly restores full balanced power while the permanent fault repair is scheduled.
What is the difference between PowerBack and Trident?
The Trident Service Saver installs at the meter using a single-turn meter adapter that includes a neutral connection. There’s no need to run temporary above-ground conductors – a single lineman can restore service in minutes right at the meter pan, even in backyards or difficult terrain.
Can the Trident Service Saver restore an open neutral as well as an open hot leg?
Yes. The Trident Service Saver can restore load current on an open hot leg up to its rated capacity, and it can restore full service on an open neutral up to its neutral current rating. However, it cannot restore both a hot leg and neutral simultaneously on the same service.
Are Trident Service Saver units built in the USA, and what’s the lead time?
Yes – every Trident Service Saver is designed, wound, and assembled in Shelton, Connecticut. Typical lead time is 1–2 weeks with no import delays, giving utilities fast access to reliable temporary power restoration equipment when they need it most.
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