Informational Brochure

Switch Operating Mechanisms – Manual

Description A switch operating mechanism is a means for opening or closing a group operated air switch and occasionally a single pole switch, from a fixed position, usually at ground level. Forces are transmitted from the operator’s position to the moving parts of the switch. The two most commonly used operators are torsional (swing handle) and worm gear types. Swing Handle The swing handle is a manually operated torsional mechanism, which is hinged to the vertical operating pipe. Two lengths of handles are available. A three-foot handle and a five-foot telescopic handle. The swing handle is actuated by raising the handle to a position parallel to the ground followed by a direct horizontal lever action applied to rotate the vertical operating pipe. The three-foot handle is used primarily for switches rated 8.25 thru 72.5 kV. The five-foot handle is used for lower voltages where additional operating effort is required by accessories or for higher voltage switches 121 thru 170 kV.

Worm Gear The worm gear is a manually operated torsional mechanism. It is recommended for operating tree-pole switches requiring increased operating effort depending on switch type, ratings and interrupter attachments. The worm gear is a corrosion free mechanism consisting of a 15-inch crank handle and weather sealed gearbox. It is available in gear ratios of 46:1, 62:1, 80:1 and is especially designed to prevent backlash.

Three-Pole Torsional Control Operating Mechanism

A three-pole torsional control can be activated by a simple swing handle, a worm gear or a motor operator depending on torque required. Offset Bearing Same as the switch bearing with two sets of stainless steel ball bearings, weather-sealed and maintenance free. Multi-Angle Crank Switch and controls can be relocated to different structures and different offset angle with no change in parts.

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