ELECTRIC OPERATING MECHANISM 7S-RM-IM

Key Features and Functionality

• Highly Integrated and Compact Sealing: The operating mechanism is completely isolated from the SF₆ gas chamber, connected to the internal moving contact system via a sealed shaft. This ensures complete gas sealing and achieves maintenance-free operation.
• Three-Position Integrated Design: The switch unit is typically a “three-position” switch, integrating isolation (close), earthing (open), and isolation (disconnect) functions into a single switch, operated by a single mechanism.
• Simple and Reliable Operation: Due to SF₆ gas’s excellent arc-quenching properties, even when used as a load switch, the operating force is low, allowing for a more compact mechanism design.
• Local and Remote Operation:
  Local Operation: Typically equipped with a manual operating hole for local closing/opening using a dedicated operating handle.
  Motorized Operation: Enables remote motorized control of the three-position switch via an external control power source, serving as a key component for Distribution Automation (DA) and remote control.
• Forced Sequence Operation and Safety Interlocking:
  Core functionality ensures the “open before closing” logic between three positions. Electrical interlocking is achieved with circuit breaker units (if present) or between cabinets.
• Status Monitoring and Feedback:
  Auxiliary contacts provide real-time feedback of the switch’s positional status (ON/OFF/EARTH) to the DTU (Distribution Terminal Unit) or monitoring center. Expandable monitoring includes gas chamber pressure (low-pressure alarm, lockout).