All the Protection Your Transformers Need — At Unprecedented Cost Savings.

Trans-Rupter II® Transformer Protector Model SE is specially designed to provide a complete overcurrent protection system for distribution substation transformers. Its electrically tripped, manually reset pole-units offer three-phase tripping, a 31.5-kA fault-interrupting rating, and a 3-cycle interrupting time — just like more-expensive circuit breakers. But unlike circuit breakers, the Trans-Rupter II Model SE includes a self-powered overcurrent protection system that dramatically reduces the total installed cost. The overcurrent protection system offers comprehensive instantaneous and time-overcurrent protection, along with a trip-energy supply that eliminates the need for a separate control-power source.

Consider how Model SE can save you tens of thousands of dollars over the cost of more expensive transformer-protective devices:

No control house needed — eliminates the civil works, foundation, and real estate needed for a control house — along with associated control equipment. By eliminating the control house alone, Model SE offers substantial cost savings.
No substation batteries, no battery maintenance — Model SE’s self-powered overcurrent protection system includes a trip-energy supply powered by transformer current transformers . . . eliminating the need for costly, ongoing battery maintenance, which is otherwise critical to ensure the reliability of the transformer’s protection scheme.
User-furnished relays are not needed — Model SE’s overcurrent protection system provides three single-phase, self-powered overcurrent relays, and S&C can furnish an optional fourth relay to measure the neutral current. No additional control devices are needed.
Real estate and foundation costs are minimized — Trans-Rupter II offers substantial mounting flexibility, which minimizes foundations and the real estate needed for the device. The pole-units mount easily on a wide variety of substation structures and equipment, including the source-side disconnect switch. In addition, Model SE’s control cabinet can be installed on most structures.
Wiring and associated trenching requirements are reduced — Trans-Rupter II’s overcurrent protection system simply needs to be connected to transformer primary-side current transformers. There’s no need to run wiring to a control house. And wiring for Model SE’s overcurrent protection system is completed at the factory, eliminating the relay wiring that would be required for a control house.

Contact S&C to learn how the Trans-Rupter II Model SE can reduce the cost of reliable transformer protection on your system.