Indoor switch disconnectors type OM, OMB are designed for application in the indoor switchboards of rated voltage 7,2 - 24kV and are using for switchiong-on and switching-off of the currents that are not greater than swithboard rated continuous current. In open condition the safe insulation gap in the circuit is provided.

Catalog and project materials:
• Catalogue sheet in pdf format
• Exchange of LHTCJ apparatus in MV switching station in pdf format
• Manual operation mechanism type NRW04 adaptation in pdf format

  - Adobe Acrobat Reader

CONSTRUCTION AND OPERATING PRINCIPLE:
Switch disconnectors type OM have secant construction and is based on modular principle. The basic unit consist a frame with insulators and current carrying parts. A triple pole earthing switch as easily as fuse base can be fitted.Stored spring energy operating mechanism with a snap action mechanism is mounted on the frame. To ensure correct operation for all relevant currents, the switch disconnector system OM/OMB is equipped with an arc extinguishing system. When interrupting the current, a current independent air blast automatically starts at the correct time during the interrupting process. This is achieved by designing the insulators on the opening side as cylinder with pistons. The pistons are connected to the mechanism in the same way as the moving contacts. The air blast therefore starts simultaneously with the contact movement (autopneumatic air blast). The switch disconnectors may be opened and closed by the following operating mechanisms: - electric, type NSW30; - manual, type NR-1. As a standard, the mechanism is equipped with 1400mm length isolating rod. Accessories such as shunt trip (220VAC, 110VAC, 220VDC, 110VDC) and auxiiliary switch ŁK - 15 can easily be added.

CHARACTERISTIC FEATURES: