High Voltage Isolation Switch

HUAJIDIAN’s high-voltage isolation switch is a no-load isolation device without arc-extinguishing capabilities. Its primary function is to create a clear, visible air gap after the circuit breaker opens, physically isolating the power source from the load side to ensure the safety of maintenance personnel.

As a mainstream intelligent isolation device for distribution automation retrofitting, it can operate independently or combine with standard pole-mounted vacuum circuit breakers to form a "circuit breaker + isolation switch" integrated unit. With deep expertise in China's medium-voltage outdoor power equipment sector, we offer both standardized products and customized solutions that comply with international technical standards regarding voltage, insulation, and automation.

Core Structural Components

1. Top-mounted Gray Electric Operating Mechanism / Intelligent Controller

Features a built-in motor, transmission gears, and control module. It supports local manual operation, electric opening/closing, and remote dispatch control, allowing direct integration into distribution automation systems. It also supports optional modules for remote position signaling and live-line indication, meeting smart grid requirements for "Four Remotes" (remote signaling, remote measurement, remote control, and remote adjustment).

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2. Insulating Bushings

The left and right phases utilize large-shed insulators to support the conductive circuit, while the center phase features a compact, small-shed structure serving as the insulating support for the grounding switch and transmission mechanism, facilitating compact installation on utility poles.

3. Conductive Contacts and Terminals

Made from high-conductivity alloy and treated for corrosion and oxidation resistance, ensuring stable circuit continuity in harsh outdoor environments.

4. Central Lifting Ring and Spring Interlock Structure

Enables mechanical interlocking between manual operation and the grounding switch; locks the open/closed positions to eliminate the risk of accidental operation.

Key Functional Advantages

1. Visual physical isolation ensuring maintenance safety

Upon power-off, the High Voltage Isolation Switch creates a distinct air gap, completely separating the power source from the load, in compliance with global safety standards for grid maintenance.

2. Three control modes adapted to various O&M scenarios

Manual, electric, and remote control options are available; remote centralized operation replaces on-site pole climbing, significantly reducing safety risks associated with live-line operations.

3. Compatibility with distribution automation systems

Real-time transmission of open/closed status signals to the automation master station, meeting the remote signaling requirements for smart grid self-healing upgrades.

4. Expandable functional modules

Optional accessories include live-line indicators, fault monitoring, and anti-misoperation interlocks, meeting diverse smart grid construction needs across different regions.

5. Compact pole-mounted design

A reduced-size shed structure on the center phase minimizes the overall equipment volume, allowing for installation on existing utility poles without requiring additional mounting brackets.

Structural representation

Type introduction

Standard Core Technical Parameters

Key Application Scenarios

1. Used in conjunction with ZW8-12 or ZW32-12 pole-mounted vacuum circuit breakers to meet mandatory isolation requirements for line maintenance;

2. Sectionalizing and branching lines during urban and rural distribution network automation upgrades, enabling remote isolation of faulty sections;

3. Dedicated safety isolation device for maintenance and equipment replacement on 10kV urban and rural overhead main and branch lines.

Real-World Implementation Case

In 2025, a power supply bureau in Southeast Asia launched a smart distribution network upgrade project for rural areas, covering 42 towns and villages and over 180 kilometers of 10kV overhead lines. The original lines were equipped only with traditional manual disconnect switches lacking remote control capabilities; maintenance personnel had to climb poles for on-site operation, resulting in prolonged outages and high safety risks.

The project contractor selected HUAJIDIAN’s smart High Voltage Isolation Switch, paired with ZW32-12 vacuum circuit breakers, to establish an automated sectionalized line system. A total of 126 units were supplied, featuring customized modifications to meet local national standards for insulation and communication protocols.

Significant results achieved after one year of grid-connected operation:

1. Line switching operations are performed entirely via remote control from the dispatch center, reducing the frequency of on-site live-line work by 85%;

2. The time required for fault isolation and power restoration has been reduced from 2–3 hours to under 3 minutes, significantly enhancing power supply reliability;

3. The visible isolation gap structure eliminates the risk of electric shock during maintenance, resulting in zero safety incidents throughout the year.

This project fully validates the product's suitability for overseas grid upgrades and demonstrates HUAJIDIAN’s capabilities in providing one-stop, customized services.

Comparison: HUAJIDIAN Smart Disconnect Switch vs. Standard Manual Disconnect Switch

Manufacturing Capabilities and Customization Services

HUAJIDIAN operates an independent manufacturing facility integrating R&D, stamping, assembly, and finished-product testing, fully equipped with comprehensive high-voltage electrical performance testing apparatus. We welcome global clients to schedule on-site visits to our production lines and testing facilities, and to select samples in person.

We support comprehensive customization based on national standards: insulation parameters, communication protocols, operating voltages, mechanical interlocking structures, and enclosure protection ratings can all be adjusted. Whether for standard bulk procurement or specialized project-specific equipment, our technical team provides one-on-one solution support; inquiries regarding parameters, quotations, and custom drawings are welcome at any time.

FAQ

Q1: Can this High Voltage Isolation Switch interrupt load current on its own, like a vacuum circuit breaker?

A1: No. This device is designed for no-load operation and lacks an arc-extinguishing chamber. The vacuum circuit breaker must first interrupt the load current before the disconnect switch creates a visible isolation gap. Switching under load is strictly prohibited to prevent arc-related short-circuit accidents; this device must be used in conjunction with pole-mounted circuit breakers such as the ZW8-12 or ZW32-12.

Q2: Is remote control a standard feature or does it require additional customization?

A2: An electric operating mechanism and remote communication interface come standard with HUAJIDIAN smart disconnect switches; remote signaling for open/closed status is built-in at no extra cost. Optional modules—such as live-line indicators or fault monitoring extensions—can be added based on specific project requirements.

Q3: Can the product parameters be modified to comply with electrical standards in countries other than China?

A3: Yes. As a professional manufacturer of medium-voltage power distribution equipment, we offer full-parameter customization to meet standards worldwide—including rated current, short-time withstand current, insulator creepage distance, remote communication protocols, and control power supply voltage. Simply provide the local official electrical specifications, and our R&D team will optimize the product structure and parameters to ensure compliance with regional certification requirements.