D.o.g.o. Switches

Product Details:

Air break switches, also known as air disconnect switches or simply disconnect switches, are mechanical switching devices used in electrical power systems for isolation and disconnection of electrical circuits. Here's an overview of their features and functions:

1. Isolation: Air break switches provide a means to physically isolate a section of an electrical circuit from the rest of the system. This is important for maintenance, repair, and safety purposes, allowing workers to safely work on the disconnected portion without risk of electric shock or injury.

2. Operating Principle: Air break switches operate by creating a gap between two conductive elements, typically blades or contacts, within a housing filled with air. When the switch is opened, the contacts physically separate, breaking the electrical circuit and preventing the flow of current.

3. Voltage Rating: Air break switches are available in various voltage ratings to suit different applications. They can be found in low, medium, and high-voltage systems, with ratings ranging from a few hundred volts to several hundred kilovolts.

4. Design: Air break switches come in different designs, including vertical and horizontal configurations, as well as single-phase and three-phase versions. They can be manually operated or motor-operated, depending on the specific requirements of the application.

5. Construction: The main components of an air break switch include the blades or contacts, the insulating housing, and the operating mechanism. The blades or contacts are typically made of copper or aluminum for conductivity and corrosion resistance, while the housing is made of insulating materials such as porcelain, polymer, or fiberglass-reinforced plastic.

6. Interlocking Mechanisms: To prevent accidental operation and ensure proper sequence of operations, air break switches may be equipped with interlocking mechanisms. These mechanisms ensure that adjacent switches cannot be operated simultaneously, reducing the risk of electrical faults and ensuring safe operation.

7. Weatherproofing: Air break switches used in outdoor applications are designed to withstand various environmental conditions, including temperature extremes, moisture, and UV radiation. Weatherproof enclosures and sealing mechanisms help protect the internal components from the elements.

8. Testing and Maintenance: Regular testing and maintenance of air break switches are essential to ensure their proper functioning and reliability. This may include visual inspections, lubrication of moving parts, and electrical testing to verify continuity and insulation resistance.

Product Details:

An 11 kV dropout switch, sometimes referred to as a dropout fuse cutout or simply a dropout switch, is a type of protective device used in electrical power distribution systems operating at 11,000 volts (11 kV). Here's an overview of its features and functions:

1. Voltage Rating: The dropout switch is specifically designed to operate at 11 kV, making it suitable for medium-voltage power distribution systems.

2. Protective Function: The primary function of the dropout switch is to protect the electrical system from overcurrent conditions, such as short circuits or overloads. It operates by interrupting the flow of current when the current exceeds a predetermined threshold.

3. Construction: A typical dropout switch consists of a fuse element housed within a protective enclosure, often made of materials such as porcelain or polymer. The fuse element is usually made of a material with a low melting point, such as copper or silver, which melts when subjected to excessive current flow.

4. Mounting: Dropout switches are usually mounted on insulating supports or brackets, either indoors or outdoors, depending on the application and environment.

5. Installation: These switches are installed in series with the distribution lines or equipment they are intended to protect. They are often installed at intervals along the line to provide comprehensive protection.

6. Operational Principle: The switch operates based on the principle of thermal protection. When the current exceeds the rated value, the fuse element heats up due to the Joule effect. Eventually, the fuse element melts, interrupting the circuit and isolating the faulty section from the rest of the system.

7. Resetting: Like most dropout fuses, dropout switches are typically designed for one-time use and must be replaced after they operate. Once the fuse element melts, it must be replaced with a new switch to restore protection to the system.

8. Visual Indication: Some dropout switches are equipped with indicators that show when the switch has operated, making it easier for maintenance personnel to identify and replace the faulty switch.