English
Home > Products > Indoor HV Isolation Switch

China Indoor HV Isolation Switch Manufacturer, Supplier, Factory

Reliable electrical isolation is non-negotiable for safe facility operations. Our Indoor HV Safety Disconnect Switch provides a crucial, visible air gap, ensuring personnel safety during maintenance and emergency shutdowns. As a core component of modern Indoor High Voltage Switchgear Equipment, it is engineered for dependable performance in controlled environments. We offer robust solutions for common distribution voltages, including our precise Indoor Electrical Disconnect Switch 11kV and our heavy-duty Indoor Electrical Disconnect Switch 33kV, designed to meet stringent international standards for indoor applications.


The Indoor HV Isolation Switch is engineered for durability and operational safety in demanding indoor substations and industrial power distribution centers. Its compact, rigid construction allows for efficient integration into switchgear assemblies, maximizing space utilization without compromising on safety or accessibility. The switch mechanism provides a clear, unambiguous indication of its open or closed status, a critical feature for lock-out/tag-out (LOTO) procedures. Robust insulation materials and precision-machined contacts ensure consistent performance and long service life, minimizing maintenance requirements and operational downtime. It is a fundamental safety device for managing and isolating high-voltage circuits.

Key Product Specifications

  • Rated Voltage: 12kV, 24kV, 36kV
  • Rated Current: 630A, 1250A, 2000A, 2500A, 3150A
  • Rated Short-Time Withstand Current: 25kA, 31.5kA, 40kA (3s)
  • Rated Peak Withstand Current: 63kA, 80kA, 100kA
  • Power Frequency Withstand Voltage (1 min): 42kV, 65kV, 95kV
  • Lightning Impulse Withstand Voltage: 75kV, 125kV, 185kV
  • Mechanical Life: 2000 operations minimum
  • Operating Mechanism: Manual (lever), Motor-operated (optional)
  • Standards Compliance: IEC 62271-102, IEEE C37.34, ANSI

Detailed Technical Parameters

Model Series Rated Voltage (kV) Rated Current (A) Short-Time Current (kA/3s) Insulation Level Mounting Type
IHVIS-12 12 630 - 2500 25 - 31.5 LI 75kV / AC 42kV Fixed, Withdrawable
IHVIS-24 24 1250 - 3150 31.5 - 40 LI 125kV / AC 65kV Fixed, Withdrawable
IHVIS-36 36 2000 - 3150 31.5 - 40 LI 185kV / AC 95kV Fixed

Design & Construction Features

  • Enclosure: Hot-dip galvanized steel or aluminum alloy, with corrosion-resistant coating.
  • Contacts: Silver-plated copper alloy main and arcing contacts for low resistance and high durability.
  • Insulation System: Epoxy resin insulators or porcelain with high creepage distance, designed for polluted environments.
  • Interlocking: Mechanical and optional electrical interlocks to prevent incorrect operation.
  • Earthing: Integrated maintenance earth switch available for enhanced safety.
  • Viewing Window: Polycarbonate window for visible contact position verification.

Related Products

Hot Products

  • Drop-Out Fuse

    Drop-Out Fuse

    Drop-Out Fuse is manufactured and supplied by SanGao for use in overhead distribution systems, including fuses, fuses, and accessories. Drop out fuse is an electrical safety device used for utility poles to protect electrical equipment and systems from overload or short circuit damage. Drop out fuse, also known as drop out circuit breaker or simply circuit breaker, is an electrical fuse mainly used in distribution lines to protect transformers, wires, and other equipment from overcurrent effects. If you have any specifications you want, please feel free to contact us at any time!
  • Indoor Grounding Switch

    Indoor Grounding Switch

    SanGao is a professinal China quality Indoor Grounding Switch supplier. As an advanced product designed to meet the highest technical standards. This High-performance Indoor Grounding Switch has undergone rigorous evaluation and complies with GB1985 and IEC62271 standards, and is suitable for 3-12kV, three-phase AC 50Hz power systems. Every distribution system must be equipped with protective devices to protect electrical appliances and equipment from the impact of accidents. This Indoor Earthing Switch has short circuit closing capability, which can protect other electrical equipment from potential damage, and can be seamlessly integrated with various medium voltage switchgear. In addition, it is also a key protective component in the maintenance process of medium voltage electrical equipment.
  • High Voltage Electric Surge Arrester for Power Systems Protection

    High Voltage Electric Surge Arrester for Power Systems Protection

    Safeguard your utility network by choosing a premier High voltage Electric Surge Arrester for Power Systems Protection manufacturer. Sangao specializes in the production of these composite-housed arrays, offering international contractors the ability to buy top-tier protection equipment that provides crucial and reliable protection for power equipment.
  • Electric Fuse Drop Cutout Switch

    Electric Fuse Drop Cutout Switch

    SanGao, a professional Chinese manufacturer of Electric Fuse Drop Cutout Switch, develops and produces heavy-duty overhead line protection devices. The product is applicable to 11KV–38KV power distribution systems, which can form an immediate mechanical circuit break when overload and short circuit faults occur, avoiding irreversible damage to downstream power equipment.
  • Load Breaking Switch

    Load Breaking Switch

    SanGao high quality Load Breaking Switch, a load switch, also known as a load switch, is an electrical switchgear used in power systems to disconnect and connect load currents. It is mainly used in medium voltage distribution systems (typically 3.6kV~40.5kV). Load switches usually have a certain ability to interrupt load current, but cannot interrupt short-circuit current. They are usually used in conjunction with protective devices such as fuses or vacuum circuit breakers.
  • AC Indoor 10KV Load Break Grounding Switch with Fuse Clip

    AC Indoor 10KV Load Break Grounding Switch with Fuse Clip

    AC Indoor 10KV Load Break Grounding Switch with Fuse Clip manufactured by SanGao integrates switching and protective functions specially tailored for AC medium-voltage distribution networks. The triple-function design covering load switching, grounding defense and fuse installation eliminates redundant auxiliary parts, strengthens on-site electricity safety, and safeguards key power equipment throughout long-term operation.
  • Related Blog
  • Reviews

  • Why Is an AC Load Breaker Switch Essential for Modern Electrical Systems?

    ​When I first encountered the AC Load Breaker Switch, I realized how critical it is in ensuring safe and reliable electrical distribution. Many users often overlook its importance until they face unexpected electrical failures or safety concerns. This switch is not only about breaking or connecting a circuit; it safeguards equipment, prevents overload, and protects users. In today's growing demand for stable electricity, choosing the right AC Load Breaker Switch makes a significant difference in efficiency and safety.

  • Why Is the Indoor 10KV Load Break Switch So Critical for Modern Power Systems?

    The answer lies not only in its switching function but also in the stability and protection it provides across different industrial and commercial applications. Zhejiang SanGao Electric Co., Ltd. is one of the professional suppliers committed to delivering high-quality switchgear components, and this product is one of our core strengths.

  • Why Is the Cut Out Fuse Essential in Modern Power Distribution?

    ​In the world of electrical power systems, safety and reliability are always the top priorities. One component that silently plays a critical role in ensuring both is the Cut Out Fuse. This device may look simple, but it carries the heavy responsibility of protecting transformers, overhead lines, and other electrical equipment from faults and overloads. Without it, power distribution would face frequent interruptions and costly damage.

  • Do You Know the Key Considerations for Installing a Side-Mounted Indoor Vacuum Circuit Breaker?

    As a core protection device for power systems, the quality of its installation directly impacts operational safety and lifespan. During installation, strict compliance with regulations is essential, with particular attention paid to the following aspects.

  • Why Should You Choose a Side Mounted Indoor Vacuum Circuit Breaker?

    ​In modern electrical distribution systems, the demand for safety, reliability, and efficiency continues to rise. Among the wide range of circuit protection devices available, the Side Mounted Indoor Vacuum Circuit Breaker stands out as one of the most reliable solutions. Designed for indoor medium-voltage switchgear, it ensures secure power control and protection against overloads, short circuits, and system failures.

  • ​Is the Air Type Load Break Switch the Most Reliable Solution for Modern Power Grids?

    Traditional medium-voltage distribution systems frequently face challenges like hazardous gas leaks, oil spill dynamics, and intensive maintenance intervals. The eco-friendly Air Type Load Break Switch solves these critical network pain points by leveraging natural compressed air for zero-emission insulation and robust arc extinguishing. Engineered by Zhejiang SanGao Electric Co., Ltd. under the SanGao brand, this durable grid solution combines long-lasting reliability with total international ISO compliance.

Send Inquiry

X
We use cookies to offer you a better browsing experience, analyze site traffic and personalize content. By using this site, you agree to our use of cookies. Privacy Policy
Reject Accept