Triple-pole outdoor disconnecting switches are meant opening and closing electrical circuits in which current does not flow. In open position, they make a safe visible isolating gap. Earthing switches mounted on disconnecting devices are meant for short circuiting and earthing electrical grids that have been disconnected from the power supply. The outdoor disconneting switches could be equipped with one or two earthing switches. They are used in high-voltage outdoor AC switchgear.

Catalog and project materials:
• Catalogue sheet in pdf format

  - Adobe Acrobat Reader

CONSTRUCTION:
Disconnecting switches type ONIIIS have secant construction. The base is a steel frame which, together with the shaft and angle of turn limiters, forms a non-dismountable sub-assembly. The lever could be turn every 10o within the limits of full turn. Bracketing isolators are fastened to the frame, and are the mounting for the current circuit. Among constant and moving contacts there is a linear contact and the proper pressure is assured by the spring. The moving contacts are jointed with drive shaft by porcelain isolating string. The construction of disconnectors type ONIIIS allows for the addition of earthing switches. Earthing switches may be located on the side of the permanent inseparable contact (lower earthing switches) or on the side of the permanent separable contact (upper earthing switches). Between the disconnector shaft and the earthing switch shaft, there is a mechanical interlocking ensuring the proper order of switching. The disconnectors, equipped with manual or electric operating mechanism, may operate in horizontal or vertical position. The clamps are adapted for fastening flat busbar in parallel to the frame. The disconnectors may be operate by the following plane operating mechanisms: manual, type NNP and electric, type NSL60 or by intersecting axis gear with rotary operating mechanisms: manual, type NR-5 and electric, type NSO30. The drive is engaged with the disconnecting switch by adjustable tubular string.

CHARACTERISTIC FEATURES: