24kV 630A SF6 Gas-Insulated Disconnector Switch

Dongfa Intelligent supplies global C-GIS (Cubicle Gas-Insulated Switchgear) builders with factory-direct 24kV 630A SF6 Gas-Insulated Disconnectors. Modeled as DF DS-24, it is specifically designed for compact gas-insulated panels. Utilizing SF6 gas insulation, it achieves a compact phase spacing of just 230mm while providing high lightning impulse withstand levels of 125kV/145kV. It features 20kA/1s thermal stability and symmetrically designed operation holes. Buyers seeking to build highly reliable gas-insulated distribution nodes in confined spaces can request a quote for technical selection support.

In traditional air-insulated switchgear, a 24kV system typically requires a phase spacing of 300mm or more to meet insulation distance requirements. In C-GIS, cabinet dimensions are extremely compressed. This product seals the primary conductive circuit in an SF6 gas environment (rated charging pressure 0.05MPa). Since the dielectric strength of SF6 gas is 2.5 to 3 times that of air, this allows the product to stably withstand 125kV phase-to-phase/earth lightning impulse voltage and 65kV power-frequency withstand voltage at a phase spacing of only 230mm. This drastically reduces the switchgear footprint, making it ideal for space-constrained urban substations, underground distribution rooms, and offshore platforms.

Through-Gap Design: Safety Guarantee of 145kV Interrupter Withstand

The drawing shows the disconnector's interrupter gap lightning impulse withstand reaches 145kV, and the power-frequency withstand is 60kV. In the open position, a clearly visible isolation gap is formed between the moving and fixed contacts. Combined with the strong insulating capabilities of SF6 gas, it ensures the safety of maintenance personnel even under extreme overvoltage conditions.

M1 & E1 Life Class: Matching the Maintenance-Free Cycle of C-GIS

Once a C-GIS is sealed, internal components are extremely difficult to replace. This product is certified to M1 class (mechanical endurance) and E1 class (electrical endurance), meaning its internal mechanical transmission structure requires no frequent maintenance within its specified life cycle, fully meeting the 20+ year maintenance-free operation requirements of C-GIS equipment.

Drawing Details Analysis: Symmetrical Design and Anti-Misoperation Interlocks

Minimalist Symmetrical Mounting and Operation Holes

From the attached engineering drawing (Overall dimension: H 401.5 x W 777 x D 341 mm), the product's design is highly modular. The bottom note explicitly states: "The size of the mounting holes of the inlet and output mechanisms, as well as the grounding operation holes and the closing operation holes, is exactly the same." This highly symmetrical design not only reduces machining difficulty for switchgear builders but also allows field O&M personnel to use the same set of operating tools or handles for different functions, greatly improving assembly and operational fault tolerance.

Clear Mechanical Operation and Locking Points

The front of the drawing clearly marks the Lock operation hole and Grounding operation hole. In the complex busbar and breaker rooms of gas-insulated switchgear, this high integration of mechanical points helps builders design more rigorous five-prevention mechanical interlocking systems, preventing catastrophic misoperations such as earthing an energized circuit or closing a breaker with the earthing switch closed.

Technical Specifications & Selection Guide

Core Technical Parameters (Based on DS-24 Drawing)

Key Points for Project Matching

• C-GIS Compatibility: Designed specifically for C-GIS. Confirm the gas chamber dimensions and sealing interface of your existing panel.
• Phase Spacing Confirmation: Standard phase spacing is 230mm. Confirm if busbar interfaces match.
• Operation Hole Adaptation: Confirm the handle interface (the drawing shows inlet, output, grounding, and closing holes are the same size).

Core Advantages

SF6 Gas Insulation for Extremely Compact Dimensions

Achieves 125kV withstand at 230mm phase spacing, significantly reducing the overall dimensions of 24kV gas-insulated switchgear, lowering footprint and civil construction costs.

High-Spec Interrupter Insulation for Safe Isolation

Interrupter gap lightning impulse withstand reaches 145kV, and PF withstand is 60kV. Combined with SF6 gas, it ensures absolutely reliable insulation isolation in the open state.

Highly Symmetrical Installation and Operation Design

Inlet/output mounting holes, grounding, and closing operation holes share exactly the same dimensions, reducing machining complexity for builders and improving on-site O&M efficiency.

Factory Direct with Rich C-GIS Support Experience

Dongfa Intelligent factory-direct supply, leveraging the Yueqing high-voltage electrical supply chain. We possess mature sealing processes and gas detection capabilities at better prices than EU/US brands.

Company Strength

SF6 Gas Sealing and Leak Detection Process

Dongfa Intelligent (Zhejiang Dongfa Intelligent Electric Technology Co., Ltd.) was founded in 2012, with 14 years of focus on high-voltage electrical manufacturing. For SF6 gas-insulated disconnectors, our core strength lies in gas tightness and moisture control. After assembly, every gas-insulated disconnector must undergo strict SF6 gas filling, helium mass spectrometer leak detection, and micro-moisture testing to ensure the annual leakage rate at the rated pressure of 0.05MPa is far below national standards, meeting the 20-year lifespan requirement of C-GIS.

High-Low Voltage Collaborative Supply for One-Stop Matching

In addition to SF6 disconnectors for gas-insulated cabinets, we also offer indoor/outdoor VCBs, load break switches, earthing switches, and LV equipment. Switchgear builders can purchase core components from Dongfa Intelligent in one stop, ensuring perfect compatibility between internal gas chamber parts and external control systems.

FAQ (Specific to 24kV SF6 Disconnectors)

Q1: Can this disconnector be used in a normal air-insulated switchgear?

A: Not recommended. This product uses SF6 gas insulation design; its insulation margin and dimensions are optimized for sealed C-GIS gas chambers. If exposed to air, its compact phase spacing would not meet air insulation requirements.

Q2: What does the minimum pressure of 0.055 Bar represent?

A: The drawing shows a rated charging pressure of 0.05 MPa (gauge pressure) and a rated minimum SF6 gas pressure of 0.055 Bar. When the pressure drops below the rated minimum (usually indicating a leak), the gas density monitor will send an alarm signal, prompting O&M personnel to refill or inspect.

Q3: Why are the mechanical and electrical endurance classes M1 and E1?

A: C-GIS disconnectors are typically used for isolation and maintenance disconnection, not for breaking load current or frequent operation. M1 (basic mechanical endurance) and E1 (basic electrical endurance) classes fully meet the requirements of a 20+ year operational life as an isolating component in a gas-insulated cabinet.

Q4: What does "inlet, output, and operation hole sizes are the same" on the drawing mean?

A: This is a huge convenience in engineering design. It means you don't need to prepare different specifications of bolts or handles for different operational functions (e.g., closing, earthing, inlet/outlet connection), greatly simplifying the builder's BOM and on-site assembly process.

Q5: Are you a factory or a trader? Do you support factory audits?

A: Dongfa Intelligent is an own factory in Yueqing, Zhejiang, founded in 2012, with 14 years of manufacturing experience. Factory audits are supported. You are welcome to visit our SF6 filling and leak detection lines.

Q6: Is MOQ 1 unit true? What is the lead time?

A: Standard products support 1-unit trial orders. Standard lead time is 7–15 working days; custom products take 15–30 working days.

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Please provide: System Voltage + Rated Current + Gas Chamber Dimensions + Phase Spacing + Quantity.