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Disconnector switch products support safe circuit isolation, sectionalizing, and maintenance control in MV and HV power systems. Sasun International Electric Co., Ltd. / Yiwu Sasun Electrical Co., Ltd. manufactures, supplies, and exports HV and MV switching and isolation equipment. Our range includes switch disconnectors, isolator disconnectors, air break switches, and related overhead line power distribution equipment. These products serve utilities, substations, power grids, and electrical contractors.
This category covers both load-operable switch disconnectors and off-load isolators. It helps engineers and procurement teams choose equipment by voltage class, rated current, short-time withstand current, installation environment, and applicable standard.
A disconnector switch is used to isolate a circuit, feeder, or part of an electrical installation. It gives maintenance teams a clearly defined safety separation before inspection or repair work begins.
In MV systems, switch disconnectors may be used for controlled switching operations. They are designed to operate on-load and extinguish the electric arc produced when rated current is interrupted. In HV and MV installations, isolators, also known as disconnectors, provide visible circuit interruption for inspection, maintenance, and system safety.
Sasun supplies these products for power transmission systems, power distribution systems, substations, urban and rural power grids, high-voltage circuit maintenance, and utility applications. We also support one-stop procurement for related high-voltage electrical products. These include load break switches, load break tools, fuse cutouts, lightning surge arresters, insulators, vacuum circuit breakers, cable accessories, and power fittings.
Buyers who need project background and company capability can review our high-voltage electrical product manufacturer information. For faster quotation preparation, please share the required product type, rated voltage, rated current, short-time withstand current, installation type, operating mechanism, terminal connection, standard requirement, and project quantity. Sasun can recommend suitable MV switch disconnector, HV disconnector switch, substation isolator, or outdoor air break switch configurations based on your project data.
The Sasun product range focuses on MV and HV power system isolation and switching applications. It includes MV switch disconnectors for switchgear and overhead line systems. It also includes MV and HV isolator disconnectors for visible off-load isolation. Outdoor air break switches and substation disconnectors are available for distribution networks and AIS substation applications.
Different projects require different electrical ratings, mechanical structures, operating mechanisms, insulation levels, and mounting arrangements. The overview below can help procurement teams identify the appropriate type before requesting a datasheet or quotation.
MV switch disconnectors are used where switching operations must be performed within the equipment’s rated conditions. They are commonly applied in MV switchgear and MV overhead line systems. These applications require rated current interruption and reliable network operation.
Depending on the product type and system design, arc extinction can use an air-insulated arcing chamber, SF6-insulated arcing chamber, or air break switch design. Main MV characteristics commonly include rated voltages of 2 kV, 12 kV, 17.5 kV, 24 kV, and 36 kV. Common rated currents include 400 A, 630 A, and 1,250 A. Rated short-time withstand current values for 3 seconds include 5 kA, 16 kA, 20 kA, and 25 kA.
Isolators, also known as disconnectors, isolate circuits or circuit sections in MV and HV installations. They provide a visible interruption point for operators and maintenance teams. Their key purpose is safety isolation, not load current interruption.
MV isolators are typically installed in MV switchgear and MV overhead line systems. HV isolators are generally installed outdoors in AIS substations on metallic structures. They may also be installed indoors in GIS substations, depending on the substation design. Because isolators are not designed to extinguish load arcs, they should only be operated off-load. The circuit must first be de-energized by suitable switching or protection equipment.
Outdoor air break switches and substation disconnectors are used in overhead line networks, outdoor substations, utility distribution systems, and visible isolation points. They help utilities and maintenance teams sectionalize lines, isolate equipment, and establish a clear disconnection point before inspection or repair.
Sasun can support configuration by mounting structure, operating handle arrangement, insulation level, creepage distance, terminal type, and mechanical layout. For outdoor applications, customers should share environmental conditions, installation drawings, mounting details, and applicable standards. This information helps our team select the correct air break switch or substation disconnector arrangement.
Correct disconnector switch selection is critical because switch disconnectors and isolators are used differently. A switch disconnector performs switching operations on-load within its rated conditions. It is equipped or configured to manage the electric arc produced when rated current is interrupted.
An isolator is mainly intended to provide visible off-load isolation. It is used after current has already been interrupted by a circuit breaker, switch disconnector, fuse, or other suitable device.
Operating an isolator under load can create an arc blast, damage equipment, and cause serious hazards for personnel. For this reason, the duty requirement must be confirmed early. Choose a switch disconnector when load current interruption is required. Choose an isolator or disconnector when visible off-load isolation is the required function.
Safety note: Do not select an isolator as a load-breaking device. If your project requires both switching and isolation, share the single-line diagram and operating sequence with Sasun. Our team can recommend the correct switch disconnector, isolator, or related high-voltage switching equipment.
Sasun positions itself as a reliable partner for high-voltage electrical products and power distribution solutions. As a manufacturer, supplier, and exporter, we support customers who need coordinated sourcing for switching devices, protection equipment, cable accessories, insulators, and power fittings.
For disconnector switch projects, Sasun combines product supply with technical parameter review, customization support, and related equipment sourcing. The company states that products are produced under an ISO9001 system. Sasun also emphasizes quality inspection and compliance with international standards such as IEC, ANSI, BS, DIN, and AS where applicable.
Wide range of HV and MV electrical products for transmission, distribution, substation, and utility applications.
Customization according to voltage, current, short-time withstand current, mounting structure, and installation environment.
One-stop procurement service for power facilities, maintenance tools, finished accessories, and overhead line equipment.
Support for load break tools, load break switches, fuse cutouts, surge arresters, circuit breakers, insulators, cable accessories, and power fittings.
Engineering-oriented communication based on customer drawings, product data, electrical parameters, and project standards.
Our focus on load break tools and load break switches supports practical understanding of safe switching and power distribution operation. This makes the category suitable for buyers who need both product supply and power facility support.
Engineers and procurement teams should confirm the main electrical and mechanical parameters before requesting a quotation. Final selection depends on system voltage, continuous current, short-circuit level, frequency, installation environment, insulation requirement, operation method, mounting arrangement, and applicable standard.
The following ratings reflect common characteristics used for MV switch disconnectors and MV/HV isolators. Exact availability should be confirmed by specific model, project drawings, system conditions, and required standards.
MV switch disconnectors are selected where switching operation is required in medium-voltage installations. They are commonly used in MV switchgear and MV overhead lines. Arc control may be provided by air, SF6-insulated arcing chambers, or air break switch design, depending on product type.
MV and HV isolators are selected primarily for safe visible isolation and short-circuit withstand performance. They are not selected for load interruption. They must be coordinated with the overall switching and protection system, so they are operated only when the circuit is off-load.
For accurate selection, include rated voltage, rated current, rated short-time withstand current, frequency, and indoor or outdoor installation in your RFQ. Please also include AIS, GIS, switchgear, or overhead line application details. Operating mechanism, insulation level, creepage distance, terminal connection, mounting structure, applicable standard, and drawings are also helpful.
Disconnector switches are used throughout transmission and distribution networks. They support safe circuit isolation, equipment maintenance separation, feeder sectionalizing, and visible disconnection. Sasun supplies these devices for transmission systems, distribution systems, substations, urban and rural power grids, high-voltage circuit maintenance, and utility applications.
MV switch disconnectors are often used in medium-voltage switchgear and MV overhead line systems where rated switching capability is needed. MV and HV isolators are used when operators require a visible interruption point after de-energizing the circuit. HV isolators are commonly applied in outdoor AIS substations or indoor GIS substations. Air break switches and outdoor disconnectors are suitable for overhead line and distribution network sectionalizing.
For broader application references across power and utility sectors, customers can explore Sasun’s power transmission and distribution application solutions.
Choosing the right disconnector switch begins with confirming the required function. If the device must interrupt load current, select an MV switch disconnector with suitable arc control and switching ratings. If it only needs to provide a visible open gap after de-energization, an isolator or disconnector may be correct.
After the operating duty is confirmed, match the electrical ratings and installation design to the project. The rated voltage must suit the system voltage and insulation level. The rated current must support continuous operation. The short-time withstand current must match the network fault level.
Installation details should also be reviewed before purchase. These include indoor or outdoor use, AIS or GIS substation layout, switchgear panel design, overhead line mounting, terminal connection, and operating mechanism.
Confirm whether the equipment must interrupt load current or only provide off-load visible isolation.
Match the rated voltage to the system voltage and required insulation level.
Select rated current according to continuous operating current and system capacity.
Check short-time withstand current according to the network fault level.
Confirm indoor or outdoor installation, AIS/GIS/switchgear/overhead line use, and environmental conditions.
Specify operating mechanism, mounting style, terminal connection, insulator configuration, and accessories.
Confirm the applicable international or project standard, such as IEC, ANSI, BS, DIN, or AS where applicable.
If the project includes multiple devices, Sasun can help review the overall equipment list. This may include switch disconnectors, fuse cutouts, surge arresters, circuit breakers, insulators, and power fittings for efficient one-stop sourcing.
Sasun supports custom requirements based on customer product data, electrical parameters, drawings, installation conditions, and project standards. This support is useful for substation projects, overhead line distribution projects, and utility maintenance applications. In these projects, mounting dimensions, insulation requirements, operating arrangements, and terminal configurations must match existing layouts.
Customization may include voltage and current rating, short-time withstand current, indoor or outdoor configuration, and AIS/GIS/switchgear/overhead line installation. It may also include manual or motorized operating mechanism, insulator type, creepage distance, terminal connector, mounting structure, standards and testing requirements, packaging, labeling, and documentation. Customers can send drawings, single-line diagrams, technical specifications, or sample parameters for evaluation.
Located in Yiwu Jinhua, Zhejiang, China, Sasun provides export-oriented supply support for power facility projects and high-voltage electrical equipment buyers. Our one-stop procurement capability helps customers source disconnector switches with related overhead line equipment, cable accessories, load break products, and maintenance tools.
Disconnector switch projects often require supporting equipment for protection, switching, insulation, connection, and maintenance. Sasun supplies a broad range of high-voltage electrical products and overhead line power distribution equipment. This helps utilities, contractors, and distributors purchase compatible project items from one supplier.
By combining disconnector switches with related distribution equipment, buyers can simplify technical communication and reduce sourcing complexity. This also helps coordinate accessories according to the same project requirements.
If you need HV or MV isolation equipment for a substation, switchgear panel, overhead line, utility maintenance point, or distribution project, send Sasun your technical specifications. As a Disconnector Switch supplier and exporter, we can review your voltage class, rated current, short-time withstand current, installation environment, operating mechanism, applicable standard, quantity, and delivery destination.
Please include the required product type, such as switch disconnector, isolator, air break switch, substation disconnector, MV disconnector switch, or HV disconnector switch. Drawings, single-line diagrams, mounting dimensions, terminal requirements, insulation level, creepage distance, and project standards help our team recommend a suitable configuration more accurately.
For direct inquiry, contact Sasun by phone at +86-18906892820 or email at info@loadbreaktools.com. You can also send your RFQ through the Disconnector Switch quotation contact page. Our team will support product selection and power facility solutions for transmission, distribution, substation, and utility applications.
An isolator, also called a disconnector, is mainly used to provide visible off-load isolation for safety. A switch disconnector can perform on-load switching within its rated conditions. It is designed to manage the arc produced during current interruption.
No. Isolators are generally designed for off-load operation only. Operating an isolator under load may cause arc flash, arc blast, equipment damage, explosion risk, or serious safety hazards. Sasun recommends confirming the operating sequence before selecting the equipment.
MV switch disconnectors are commonly used in medium-voltage switchgear and MV overhead line systems. Our team recommends them when rated switching capability, circuit control, and arc extinction within rated conditions are required.
HV isolators are generally installed outdoors in AIS substations on metallic structures. They may also be installed indoors in GIS substations, depending on the system design. Their main function is to provide a visible isolation point for safe inspection and maintenance.
Please provide rated voltage, rated current, short-time withstand current, installation type, operating mechanism, insulation requirement, terminal connection, mounting structure, and applicable standard. Project drawings are also helpful when available.
Yes. Sasun can support customization based on customer parameters, drawings, installation conditions, and applicable standards such as IEC, ANSI, BS, DIN, or AS. Custom requirements may include voltage, current, short-time withstand current, creepage distance, operating mechanism, terminal connector, mounting structure, packaging, labeling, and documentation.
