Copper and Aluminum Double End Break Switches Type: 1G and 1G2 Orientation: Upright mounting Ratings: 38 kV through 230 kV Ratings A: 600, 1200, 2000 Ampere Request Bulletin B110 Download PDF Catalog

Turner Type "1G" and "1G2" switches are heavy-duty, Double End Break Copper and Aluminum designs, respectively. They are most frequently applied when space is at a premium.

Turner has accumulated more than 40 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 Copper "1G" model provides full 30º C temperature rise capability.

The Aluminum "1G2" model delivers economic sensibility, as well as proven dependability.

Both provide what we call Switch-Ability!

The "1G/1G2" 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 "1G" 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 greaseless ball bearing assembly on the rotating center stack provides smooth, easy operation, in either the horizontal or vertical mounting positions. Blades are designed to lock into the closed position.

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.

"1G"/"1G2" Operating Features

The high pressure contact shoes are of cast, heat-treated, high conductivity Beryllium-copper. Although contact pressure is factory adjusted, should field adjustment ever be necessary, it can easily be made. In addition, contact changeout is fast and easy.

The "1G" tubular blade is designed of hard-drawn copper. The "1G2" blade is Aluminum tube. Each provides the proper combination of current-carrying capacity and rigidity. The blade tip is Beryllium-copper, heat treated and strato-milled to provide a machined current transfer surface. The coin silver overlay provides high pressure, silver-to-copper contact with the Beryllium-copper jaw surfaces when the tip is in the jaw.

The blade tip engages the jaw contacts in an upright condition to form a high-pressure contact. The blade and jaw contacts are wiped clean during the closing action to assure a low resistance current transfer. A patented blade locking device keeps the blade closed despite temporary faults, surge currents, twisting structures or galloping conductors. Double-spring type quick-whips provide time-proven interruption of limited amounts of charging and load currents.

The opening action of the Turner Side Break Switch is unique. Prior to the blade disengaging from the jaw contact, the blade contact rotates 22 degrees in the jaw. This exclusive Turner Twist action releases all contact friction and breaks any ice or contamination in the jaw area that may impede an easy opening procedure. The Turner switch provides effortless switch opening regardless of environmental or time effects.

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

Heat Tempered Beryllium-Copper Jaw Contacts
The high pressure, hard jaw contacts are of cast and heat tempered hard-drawn, high-conductivity Beryllium-copper.

Base
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.