Medium-voltage circuit breakers play a crucial role in protecting and controlling electrical systems operating between 15kV and 36kV. They ensure the safety of installations by interrupting fault currents and minimizing equipment damage. In this article, we'll discuss the main types of medium-voltage circuit breakers and their applications, as well as the options available on the market.
Types of Medium Voltage Circuit Breakers
Medium-voltage circuit breakers can be classified in several ways, depending on their structure and interrupting technology. Below, we explain the main classifications and their applications.
- Front Circuit Breaker vs. Side Circuit Breaker
- Front Circuit Breaker: The operating mechanism is located on the front of the circuit breaker, allowing opening and closing operations to be performed from the front. This configuration facilitates access to the control, especially in installations where the front space is more accessible.
- Side Circuit Breaker: The operating mechanism is positioned on the side of the circuit breaker, allowing operations to be performed from the side. This arrangement is useful in installations where side access is more convenient or where the electrical panel design favors this configuration.
- On Board x Off Board Circuit Breaker
- On-Board Circuit Breaker: This is a circuit breaker where all the devices necessary for the protection system's operation are integrated into a single structure, often called a trolley. This arrangement allows for a more compact protection cubicle, with the entire solution pre-assembled and tested, requiring only the primary connection for use.
- Off-Board Circuit Breaker: This type of circuit breaker does not have protective equipment incorporated into its structure, requiring the system components to be installed separately, according to the project's needs.
- Vacuum Circuit Breaker vs. SF6 Circuit Breaker
- Vacuum Circuit Breaker: Uses a vacuum chamber to extinguish the electric arc, making it highly efficient and low-maintenance. Suitable for industrial and utility applications requiring high reliability and durability.
- SF6 circuit breaker: Uses sulfur hexafluoride (SF6) gas as an insulation and arc extinguishing agent. It offers high interrupting capacity and is widely used in substations and power distribution networks.
Available Options for Medium Voltage Circuit Breakers
In addition to classification by type, medium-voltage circuit breakers can come in different configurations and accessories to meet the specific needs of each application. Some of the main options include:
- Circuit Breaker with Relay and CT (Current Transformer): This configuration allows the measurement of electrical current, protecting the system against overcurrents and short circuits.
- Circuit Breaker with Relay, CT and TP (Current Transformer and Potential Transformer): In addition to overcurrent protection, this version enables voltage measurement and protection against voltage surges and faults.
- Circuit Breaker with Relay, CT, TP, Disconnector Switch and Lightning Arrestor: Complete option that includes additional protection against electrical surges and allows the circuit to be opened and disconnected safely and efficiently.
- Circuit Breaker with UPS Option and Drive: May include a UPS system to ensure continuous operation even in cases of external power failure, as well as electric or manual drive options for greater operational flexibility.
Conclusion
Choosing the right medium-voltage circuit breaker depends on the specific needs of each electrical installation. Whether it's a front-mount or side-mount model, on-board or off-board, vacuum or SF6, having a quality, well-sized device is essential to ensure the safety and efficiency of the electrical system. Furthermore, the various configuration options allow you to customize the circuit breaker to best meet project requirements.
In the Three-phase electrical, we supply a complete line of medium voltage circuit breakers, with different configurations and accessories, ensuring reliable solutions for electrical protection in 15 to 36kV networks.
So if you are in need of medium voltage circuit breakers or other materials for primary cabinet, Contact us! It will be a pleasure to help you!
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