Medium-voltage load break switches are versatile switching devices designed for controlling and isolating electrical loads in 10–35kV power distribution systems. As essential components for improving grid flexibility and reliability, these devices enable safe switching of normal load currents and provide temporary fault isolation capabilities. Engineered for both indoor and outdoor applications, medium-voltage load break switches have become the preferred solution for line sectionalizing, transformer protection, and remote distribution points where full circuit breakers would be unnecessarily complex and costly.
Installed at sectionalizing and tie points of 10–35kV outdoor overhead distribution lines, they can frequently make and break rated load currents. This enables line sectional control, load transfer, and temporary isolation of faulted sections, significantly enhancing the operational flexibility of distribution networks.
Mounted on the high-voltage side of distribution transformer stations and at the ends of branch lines, these devices work in coordination with fuses. Under normal operating conditions, they handle load current switching operations, while fuses rapidly clear short-circuit faults — creating an efficient "control + protection" combination.
They are compatible with outdoor pole-mounted equipment in urban and rural distribution networks, including ring main unit accessories and terminals of reactive power compensation devices. These medium-voltage load break switches operate reliably within a wide temperature range from -40°C to +70°C, adapt to highly corrosive environments, and are applicable at altitudes up to 3000 meters, perfectly fitting complex outdoor operating conditions.
Ideal for unattended distribution stations, box-type substations and remote distribution sites. They support both manual and automatic operation modes, realizing normal load switching and temporary fault disposal without continuous on-site supervision, which greatly cuts operation and maintenance costs.
Medium-voltage load break switches have four core operational advantages, making them indispensable equipment in modern power distribution systems:
They are capable of closing, carrying and interrupting rated load currents under normal circuit conditions and boast outstanding frequent switching performance. Though unable to interrupt complete short-circuit currents independently, they can work together with series-connected fuses to deal with short-circuit faults efficiently, suitable for line segmentation, tie lines, branch circuits and other diverse scenarios.
Unlike circuit breakers, medium-voltage load break switches need no sophisticated arc extinguishing systems or only basic arc suppression structures, featuring smaller dimensions and lower costs. The compact structure simplifies the overall layout of power distribution equipment and reduces project investment as well as space occupation.
The enclosure adopts 304 stainless steel with powder spraying treatment, delivering superior corrosion resistance for stable operation in heavily corrosive areas. Contacts and contact fingers are made of T2 copper with integrated plating to avoid electrochemical corrosion. The switches run steadily at altitudes up to 3000 meters and in temperatures ranging from -40°C to +70°C, ensuring high operational reliability outdoors.
Available in manual and automatic operation types, they can be customized to meet diverse on-site requirements. With a mechanical endurance of 6,000 operations, they endure long-term frequent switching without failure. Low routine maintenance requirements effectively lower the operating cost of power grids and reduce power outage frequency.
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