Triple-pole indoor 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. They are used in high-voltage indoor AC switchgear.

Catalog and project materials:
• Catalogue sheet in pdf format

  - Adobe Acrobat Reader

CONSTRUCTION AND OPERATING PRINCIPLE:
Disconnecting switches type OW 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. Bracketing isolators are fastened to the frame, and are the mounting for the current circuit. The interpole isolation is an air gap, and in copies with a smaller interpole scale, the air gap is further assisted by isolating plates. The disconnectors, equipped with manual or electric operating mechanism, may operate in horizontal or vertical position. The disconnectors may be operate by the following operating mechanisms: electric, type NSW30-1 or manual, type NR-1. The construction of disconnectors 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. At the base of the disconnector, there is an earth terminal with M12x40 screw. The disconnectors may be equipped with an auxiliary switching device coupled with the apparatus, located on the end of the shaft opposite to the operating mechanism. The standard number of switch contacts is 12 (6NC+6NO).

CHARACTERISTIC FEATURES: