Modern low-voltage electrical equipment is designed with high performance, reliability, intelligence, modularity, and environmental friendliness in mind. These features ensure that the products meet the evolving demands of today’s power systems.
High performance is a key characteristic. The rated short-circuit breaking capacity and short-time withstand current have been significantly enhanced, allowing for Icu = Ics, which means the device can handle both the ultimate and service short-circuit currents. For instance, Schneider’s MT series offers a short-circuit breaking capacity of up to 150kA, making it ideal for demanding industrial applications.
High reliability ensures that the product can operate continuously without derating or overheating. This not only improves safety but also extends the lifespan of the equipment, reducing maintenance costs and downtime.
Intelligence has become a core feature with the integration of ASICs and advanced microprocessors. Modern circuit breakers now come with intelligent trip units that offer enhanced protection functions such as overload long delay, short-circuit short delay, instantaneous tripping, ground fault, and under-voltage protection. They can also display real-time system parameters like voltage, current, frequency, active and reactive power, and power factor. Moreover, they are designed to minimize false trips even in environments with high harmonic distortion.
Fieldbus technology enables communication and networking between devices, allowing for two-way data exchange with various open fieldbuses. This facilitates remote control, signaling, telemetry, and adjustment of electrical equipment. By implementing fieldbus technology, power distribution quality can be monitored more effectively, energy losses reduced, and regional interlocking among circuit breakers achieved. This enhances automation and overall system reliability. Common fieldbus protocols include Profibus, Modbus, and DeviceNet, with Modbus and Profibus being widely adopted in industrial settings.
Modularity is another important aspect. Products are designed to combine different functional modules based on specific requirements. For example, ABB’s Tmax series allows interchangeable trip units—thermomechanical, electronic, and communicable. All accessories are modular, enabling easy installation without opening the enclosure, thus improving user convenience and system flexibility.
Finally, green materials are used throughout the product lifecycle. From material selection to manufacturing and usage, the design ensures minimal environmental impact and compliance with EU environmental regulations. This makes the products not only efficient but also sustainable for future generations.
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