Double-End Break

TDEB Double-End Break Switch

Type: TDEB
Orientation: Upright or vertical mounting
Ratings: 15 through 345kV
Ratings A: 600, 1200 and 2000 Amperes

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    Turner Type TDEB switches are a heavy-duty, Double End Break Aluminum design that is most frequently applied when space is at a premium.

    Turner has accumulated more than 50 years of proven field experience in air break switches. That means you get an easily installed, easily operated heavy-duty switch that provides maximum mechanical and electrical performance under all operating conditions.

    The TDEB switch is normally used at the same phase spacing as a Vertical break switch, as blade potential floats at about 40 percent of normal line-to-ground voltage when the blades are open. Structure width is minimized, as a result. Overhead clearance is also minimized, due to the side-blade-opening characteristics.

    Heavy-duty construction, proven reliability and ease of operation make the family of TDEB switches perfect for demanding substation and line operations such as breaker isolating and bypassing; transmission line and bus sectionalizing; and isolating arrestors, metering equipment and other apparatus.

    Internal construction is simple, and virtually maintenance-free. The ball bearing assembly on the rotating center stack provides smooth, easy operation, in either the horizontal or Vertical mounting positions.

    Group operation for substation and transmission application is accomplished with an interphase pipe, group-operated control pipe, outboard bearing, Vertical operating pipe and swing handle operator.

    Reverse-loop contacts

    Turner’s TDEB switch jaw contacts increase their holding power under resistance. Reverse-loop, silver-plated copper jaw contacts employ the natural repulsion of magnetic fields moving in opposite directions to exert holding forces against the blade edges. In fault conditions, the increased current flow increases the pressure, retaining the blade in the jaws.

    TDEB Blade

    The aluminum tubular blade design provides the proper combination of current-carrying capacity and rigidity. Silver-plated copper blade tips are easily field-replaceable, as are stationary and moving arcing horns.

    Turner TDEB switches gently close into position, with the blade tip engaging the jaws at a 30 degree angle, then rotating to engage the jaw contacts. They are not slammed under force into the contacts. Both the blade and jaw contacts are wiped clean during the closing action to ensure a low resistance current transfer. A heavy-duty static blade-locking device keeps the blade closed despite temporary faults, surge currents, twisting structures or galloping conductors.

    The lock is released during the switch opening sequence, as the blade rotates 30 degrees in the jaw. This action text was removed breaks up any ice or contamination, and releases the contact friction, allowing the blade to easily be removed from the contacts.


    NEMA standard strength gray porcelain insulators of the same voltage rating as the switch will be furnished unless otherwise specified.


    Standard bases are hot-dipped, galvanized, rigid, steel sections. Lifetime bearings, requiring no lubrication, and open-close stops are built into the compact assembly. Padlockable swing handle with ground shunt.

    Make Your Double-End Break a Load-Break Switch

    For more than 35 years, Turner Electric’s TECO-Rupter® Vacuum Interrupters have been the technology of choice for loop and load-break applications because of their current-interrupting ability, superior reliability and ease of application.

    The TECO-Rupter offers industry leading performance levels including superior TRV ratings compared to other load-break technologies such as SF6, longer service life and greater interrupting capacity. No other load-break device provides 5,000 full load operations at either 2,000 or 3,000 Ampere ratings and a TRV rating up to 57kV.