Electronic Circuit Breaker

Circuit breaker based on electronic trip unit

● Features: This type of circuit breaker uses an electronic trip unit (ETU) to detect current and provides protection against overload, short circuits, and other faults through a circuit composed of electronic components. The electronic trip unit offers high precision, sensitivity, and adjustability, enabling faster and more accurate protection actions.

● Function: In addition to basic functions like long-time protection (L) and instantaneous protection (I), it may also include advanced protections such as short-time protection (S), ground fault protection (G), and MCR protection. The electronic trip unit also performs measurements such as current, voltage, power, and energy, along with auxiliary functions like pre-alarm and self-diagnosis.

● Features: This type of circuit breaker utilizes differential current detection technology to monitor unbalanced currents in the circuit. When it detects that the differential current exceeds the set value, it quickly interrupts the circuit to prevent faults from escalating. Differential protection technology offers high selectivity and sensitivity, making it particularly suitable for applications requiring precise protection.

● Construction: Typically includes a summing transformer (acting as a differential current detector), an interrupting relay, and associated test and power circuits. The interrupting relay is operated by an electronic circuit when the voltage of the secondary measuring coil of the summing transformer exceeds a predetermined threshold, thereby interrupting the circuit.

● Features: The intelligent electronic circuit breaker integrates advanced microprocessor and communication technologies to implement complex protection algorithms and remote monitoring functions. It monitors circuit status in real-time and communicates data and instructions with a host computer or remote monitoring system via communication interfaces.

● Function: In addition to basic protection functions, the intelligent electronic circuit breaker includes various protections such as low voltage protection/alarm, overvoltage protection/alarm, voltage unbalance (phase loss) protection/alarm, and phase sequence protection/alarm. It also offers auxiliary functions such as fault history recording, self-diagnosis, load monitoring, and remote operations including signaling, telemetry, adjustment, and control.

● High precision and sensitivity: Electronic circuit breakers use electronic components and microprocessor technology for precise current detection and rapid protection actions, significantly enhancing protection accuracy and reliability.

● Multifunctional and adjustable: They offer not only basic protections but also a variety of advanced protections and measurement functions. Protection parameters can be set and adjusted through interfaces to meet specific protection requirements.

● Intelligence and remote monitoring: Intelligent electronic circuit breakers employ advanced microprocessors and communication technologies for real-time circuit monitoring, data transmission, and instruction reception with host computers or remote monitoring systems. This improves power system automation and safety.

● High reliability: Electronic circuit breakers utilize professional integrated chip technology and surface-mount components to enhance product reliability and stability. They also feature self-diagnostic capabilities to promptly detect and address faults, ensuring uninterrupted power system operation.

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