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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.

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