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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 15kVA | Powerback 20kVA | Powerback 30kVA | Powerback 50kVA | |
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| High Efficiency Toroidal Auto Transformer | 20kVA (2x10kVA) | 15kVA | 20kVA | 15kVA | 20kVA | 30kVA | 50kVA |
| Recommended Service | 100A (oneAuto) 200A (twoAuto) | 150A | 200A | 150A | 200A | 320A | 400A |
| Circuit Breaker | 2x50A | 125A | 160A | 125A | 160A | 250A | 400A |
| (Dual Protections) Shunt Trip Temp. degC | NA | 105 | 105 | 105 | 105 | 105 | 105 |
| Corded Meter Adapter Included | 200A | 200A | 200A | 200A | 200A | 320A | No meter adapter - Cam-Lok kit, 10 ft 1/0 & 3/0 leads, 9-pc Flood-Seal/tinned whips. |
| 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 Stainless |
| 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 | 29 x 22 x 13 | 29 x 22 x 13 | 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" | 10.5" x 3" | 12" x 4.5" |
| Weight (lbs.) | 45 / Auto | 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.
45lb Modular Carry
Each 10 kVA Auto Transformer weighs 45 lbs and
has a handle. One person carries it up stairs, down an alley, or across a
finished yard. One module for 100A. Two for 200A.
Redundant Load-Sensing Overcurrent Protection:
Each module has its
own 50A breaker. If only one autotransformer is installed and the house
needs more than that module can carry, Trident shuts off – protecting the
transformer and the home. Built-in voltage and current monitoring adds a
second overcurrent trip path.
Flame-Rated Enclosure with Weatherproof Case:
Transformers are encapsulated
in flame-rated ABS. Non-metallic, no ground rod required, and built to sit
outdoors in wet conditions.
Single-turn Universal Meter Adapter
Locks into ring-type and ringless
sockets in one turn.
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 open neutral — from a storm, a damaged underground cable, or an 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. And a wheeled cart only helps if it can reach the meter.
Trident is the one-person service saver (also called an add-a-phase or service-savor device) for those hard-to-reach services. Each 10 kVA module weighs 45 lbs, so a troubleman can carry it up stairs, down an alley, or across a finished yard without waiting on a second crew. One module covers 100A. Two restore up to 200A.
Trident connects directly between the meter socket and the meter with a single-turn adapter. It regenerates the missing hot leg or the missing neutral, restores full balanced 120/240V or 120/208V service, and gives crews time to schedule the permanent repair on their own timeline. Designed by linemen, for linemen.
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?
Trident is Bridgeport Magnetics’ one-person service saver — a modular temporary power restoration autotransformer, also known in the field as an add-a-phase or Servisavor-style device. Each 10 kVA module weighs 45 lbs. A troubleman carries it to meters a wheeled cart cannot reach, connects it at the meter socket, and regenerates a missing hot leg or missing neutral on 120/240V or 120/208V single-phase service. One module covers 100A. Two restore up to 200A. Customers stay online while the underground repair is scheduled as planned work.
How does the Trident Service Saver connect to the service?
At the meter. Remove the customer meter, land the Trident meter adapter in the socket, lock it with the single-turn center screw, then set the meter back on top of the adapter. The adapter includes a neutral. Plug in one 10 kVA module for 100A service, or both modules for 200A. Follow the breaker sequence, confirm 120V hot-to-neutral and 240V hot-to-hot, and leave.
Ring-type and ringless sockets use the universal (AM) head. Ring-type only can use the short-blade (AG) head. Lever-bypass sockets need the CL320 base plus the metering head.
If the socket will not take an adapter, Version B lands with 10 ft leads on the panel instead of a meter head. Isolate and cap the faulted conductor first. Two of the three service conductors still have to be good.
What is the difference between PowerBack and Trident?
Both are Bridgeport Magnetics service savers (add-a-phase autotransformers). Both regenerate a missing hot leg or missing neutral on 120/240V or 120/208V single-phase service. The difference is how the unit gets to the job.
Trident is the one-person carry-in service saver. Each 10 kVA module weighs 45 lbs. A single lineman or troubleman carries it up stairs, down an alley, or across a finished yard, then installs it at the meter with a single-turn adapter that includes a neutral. One module covers 100A. Two restore up to 200A. No temporary overhead. No second crew.
PowerBack is the wheeled service saver for sites a cart can reach. Lite and 15–30 kVA models also use a meter adapter at the socket. The 50 kVA PowerBack is the multi-home unit — it does not use a meter adapter. It lands on the cabinet or pedestal secondary with a Cam-Lok kit and restores the whole meter bank.
Use Trident when the meter is hard to reach. Use PowerBack when you can roll to the socket — or when the outage is a cabinet, not one house.
Can the Trident Service Saver restore an open neutral as well as an open hot leg?
Yes. The Trident Service Saver regenerates a missing hot leg or a missing neutral on 120/240V or 120/208V single-phase service. Two of the three conductors still have to be good. It cannot restore a hot and the neutral at the same time on the same service.
Size the job to the modules on the ground: one 10 kVA module for 100A, two modules for 200A.
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 — no import delay — so utilities can put a unit on a truck when the tickets start stacking up.
Is the Trident Service Saver weatherproof?
Yes. Each autotransformer is encapsulated in a flame-rated, non-metallic ABS enclosure. It is built to sit outdoors in wet conditions. Because the case is non-conducting, Trident does not require a driven ground rod.
What protection does Trident have if the load is too high?
Redundant overcurrent protection. Each 10 kVA module has its own breaker. If only one autotransformer is installed and the house needs more than that module can carry, Trident shuts off — protecting the transformer and the home. Built-in voltage and current monitoring adds a second overcurrent trip path.
How much does a Trident Service Saver weigh?
Each 10 kVA autotransformer weighs 45 lbs. The control unit is about 9 lbs. That keeps it in one-person carry range for a troubleman or single lineman.
Can Trident be left on-site after the crew leaves?
Yes. That is what a Trident is built to do. Restore the missing hot or missing neutral, confirm voltage at the meter, and leave Trident in place until the underground repair is scheduled. The flame-rated weatherproof enclosure is made to sit outdoors. If the load exceeds what the installed modules can carry, the breakers and voltage/current monitoring shut the unit off — protecting the transformer and the home. Size the modules to the service, verify the reading, then leave it with confidence.
Item #10
Yes. The Trident Service Saver can restore a missing hot or missing neutral on a 120/240V or 120/208V service that also has solar. Follow your utility’s procedure first.
Best practice is to isolate or disconnect the solar equipment before you leave the unit on-site. A service saver does not block reverse power. Once voltage is restored at the meter, the inverter may stay online or reconnect. Export then adds current through Trident and extra heat in the windings.
If company rules allow the array to stay connected:
- Treat solar export as added load
- Size the modules to house load plus export (one 10 kVA module for 100A, two for 200A)
- Confirm 120V hot-to-neutral, 240V hot-to-hot, and a believable current reading before you leave
- Do not assume the inverter is off just because one utility conductor is open
- If Trident trips, do not reset and walk away — check whether the array is exporting
Overcurrent protection and voltage/current monitoring shut the unit off if the installed modules are overloaded. Disconnecting the solar is the cleanest install. Sizing and verifying current is the safe one if it stays connected.
