English
Home > Products > Indoor HV Grounding Device

China Indoor HV Grounding Device Manufacturer, Supplier, Factory

Ensuring the utmost safety of personnel during maintenance and operations on high voltage systems is non-negotiable. Our advanced Indoor HV Grounding Device is engineered specifically to provide a reliable, secure, and permanent earth connection for isolated sections of high voltage circuits. This critical safety component is integral to any comprehensive protection scheme, preventing hazardous induced voltages and ensuring equipment is safely discharged before work begins. For applications requiring coordination with disconnecting functions, our Indoor High Voltage Earthing Switch offers a robust solution. As a core component within substation assemblies, the High Voltage Switchgear Earthing Switch ensures integrated protection. When paired with isolation points, the HV Isolator Grounding Switch provides a clear visual and mechanical earth. Ultimately, every installation demands an HV Safety Grounding Switch to meet stringent safety protocols and protect both infrastructure and personnel.


The cornerstone of our design philosophy for the Indoor HV Grounding Device is uncompromising reliability under the most demanding conditions. Built for the rigors of indoor switchgear and control panel applications, this device features a high-strength, corrosion-resistant alloy main blade and a self-cleaning, silver-plated contact system. This ensures a consistently low and stable contact resistance over thousands of operational cycles, guaranteeing a true equipotential zone. The operating mechanism is engineered for smooth, low-effort manual operation with clear, positive indications for the "Earthed" and "Disconnected" positions, eliminating any ambiguity for the operator. All insulating components are manufactured from high-grade, track-resistant polymer materials, tested to exceed standard dielectric requirements. The compact and robust housing of the Indoor HV Grounding Device is designed for easy integration into existing panel layouts, simplifying installation and maintenance procedures.

Key Technical Specifications

  • Rated Voltage: Up to 40.5kV
  • Rated Frequency: 50/60 Hz
  • Rated Short-Time Withstand Current (3s): 31.5kA, 40kA, 50kA
  • Rated Peak Withstand Current: 80kA, 100kA, 130kA
  • Rated Normal Current: 630A, 1250A, 2000A
  • Mechanical Life: 10,000 operations minimum
  • Contact Resistance: ≤ 60µΩ
  • Operating Ambient Temperature: -15°C to +40°C
  • Protection Degree: IP4X (housing), IP2X (accessible parts)

Standard Compliance & Design Features

Feature Category Details
International Standards IEC 62271-102, IEEE C37.34, ANSI C37.72
Contact System Self-aligning, twin-pressure contacts with silver-plating for high conductivity and anti-corrosion.
Blade Material High-conductivity copper alloy with tin plating, ensuring excellent current carrying capacity.
Insulation System Vacuum-cast epoxy resin insulators providing high dielectric strength and mechanical stability.
Operation Mechanism Manual spring-assisted mechanism with positive latching, optional motorized operation available.
Interlocking Mechanical and/or electrical interlocks prevent operation under unsafe conditions (e.g., with circuit breaker closed).
Auxiliary Switches Standard configuration includes 4NO + 4NC auxiliary contacts for remote signaling and control integration.

Related Products

Hot Products

  • 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.
  • 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.
  • Electrical General Zinc Oxide Lightning Arrester

    Electrical General Zinc Oxide Lightning Arrester

    As a specialized Electrical General Zinc Oxide Lightning Arrester factory, Sangao manufactures heavy-duty overvoltage mitigation equipment designed for industrial procurement teams who want to buy high-performance surge protection. This universal grid component shields valuable distribution hardware from lightning overvoltage and operational switching transients, maintaining system balance.
  • 12kv Indoor Vacuum Circuit Breaker

    12kv Indoor Vacuum Circuit Breaker

    SanGao durable 12kv Indoor Vacuum Circuit Breaker , Named after its high vacuum insulation medium for both the arc extinguishing medium and the contact gap after arc extinguishing; It has the advantages of small size, light weight, and is suitable for frequent operation and arc extinguishing without maintenance, and is widely used in distribution networks.
  • High Voltage Earthing Switch

    High Voltage Earthing Switch

    SanGao high quality High Voltage earthing Switch is also called earthing switch. Earthing switch and earthing switch are used interchangeably. It is a protective device included in switchgear components such as circuit breakers and isolators. When the circuit breaker is removed and shaken out, the earthing switch automatically grounds the busbar section close to the circuit breaker. For isolators, the earthing switch contacts the busbar when the isolator isolates the circuit, releasing any charge that may have accumulated there.
  • High Voltage Vacuum Load Break Indoor Switch with Earthing Switch

    High Voltage Vacuum Load Break Indoor Switch with Earthing Switch

    As a China-based supplier of High Voltage Vacuum Load Break Indoor Switch with Earthing Switch, SanGao supplies unified medium-voltage switching solutions. Merging load breaking, circuit isolation and earthing functions, our equipment enables power engineering contractors to strengthen operational safety, cut maintenance complexity and raise stability for 6–12kV distribution networks.
  • Related Blog
  • Reviews

  • Why Is the Outdoor Boundary Vacuum Circuit Breaker Essential for Modern Power Distribution Systems?

    ​In the ever-evolving field of electrical power distribution, reliability, safety, and performance are non-negotiable. As outdoor electrical systems continue to expand in scale and complexity, choosing the right circuit protection device has become more critical than ever. One of the most advanced solutions available today is the Outdoor Boundary Vacuum Circuit Breaker (OBVCB) — a compact, efficient, and highly durable device designed for outdoor switching and protection of electrical networks.

  • Why Should You Choose a High-Quality Lightning Arrester?

    ​When it comes to protecting electrical systems, one of the most important components is the Lightning Arrester. This device acts as the first line of defense against dangerous voltage surges caused by lightning strikes or switching events. For industries, power distribution networks, and even residential applications, installing a reliable Lightning Arrester can mean the difference between safety and costly equipment failure.

  • Why Is the SanGao AC Isolation Switch a Critical Component for Electrical Safety and System Protection?

    In electrical systems, safety is not negotiable. Whether in industrial plants, commercial buildings, or renewable energy installations, the ability to isolate circuits during maintenance or emergencies is essential. The AC Isolation Switch from SanGao provides a reliable, visible disconnect between the power source and the equipment being serviced. With IP66 protection, multiple international certifications, and a robust design suited for harsh environments, this switch offers the safety and durability that electrical professionals demand. This article examines the features, specifications, and applications that make the AC Isolation Switch a trusted component in power distribution systems worldwide.

  • Because focus leads to professionalism.

    The high-voltage disconnector shown in the picture is a specially developed and customized product based on the requirements of our customer from Taiwan Province, China.

  • Why Is the High Voltage Grounding Switch Critical for Power System Safety and Maintenance?

    ​In power transmission and distribution systems, safety is paramount. One often overlooked but essential component is the High Voltage Grounding Switch. This device plays a vital role in protecting both equipment and personnel during maintenance, fault conditions, and routine operations. This article examines what a grounding switch does, how it works, and why it is indispensable in medium-voltage switchgear and substations. We also look at the manufacturing quality, certifications, and reliability that SanGao brings to this critical electrical component.

  • The 40.5kv Switch Recloser Effectively Improves the Operational Resilience of the Regional Power Grid

    The core of this system lies in its fast and precise operation mechanism. When a line trips due to a sudden transient fault (such as a lightning strike or a tree branch touching a line), the recloser does not passively wait for manual intervention.

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