USCO Power Switches

32

V E R T I C A L

of the switch. The laminated conductor is constructed of commercially pure aluminum strip, which does not work harden during operation. Blade The blade is constructed of heat-treated aluminum tubing with heat-treated aluminum castings welded to hinge and jaw ends. Blade Mechanism The blade mechanism of the AVR toggles in the closed position locking the switch closed. In the open position, the blade toggles over center. Blade rotation and opening are provided by a sure and simple mechanism designed to operate in adverse conditions. The mechanism is insulated to prevent any welding during fault conditions.

DESIGN CHARACTERISTICS Contacts

B R E A K S W I T C H

The AVR is supplied with reverse loop, silver- to-silver jaw contacts producing the highest conductivity initially and over time. The contact fingers, fabricated from hard drawn copper, are silver metallized and elec- tro-tin plated. The male contact, also of hard drawn copper, has a brazed silver overlay and is electro-tin plated. These methods and materials used in the application of the silver provide surfaces of differing hardness with anti-galling properties, resulting in minimal wear over years of operation. The AVR uses USCO’s time tested welded lamination hinge assembly producing a straight-line current path eliminating any current transfer at the hinge. This is accom- plished with a welded aluminum laminated conductor that is used to create a bypass at the hinge. This eliminates the need for bolted or sliding pressure connections, or high pressure contacts, and enables ease of operation. The welded connections create a single metallic path from the hinge termi- nal pads to the main contacts on the blades All contacts on the AVR are field replaceable.

ACCESSORIES • Grounding switches: Through 100kA momentary • Auxiliary switches: 12 contact decks are standard • Standard arcing horns are installed on all group operated switches • Outriggers: Custom designed for your application • Connectors: Available on all switch types

SEPTEMBER 2013

HUBBELL / USCO  – LEEDS, ALABAMA USA