Universal circuit breakers, also known as frame circuit breakers can be used to manufacture and interrupt load circuits, and can also control motors that are not frequently operated. This combines the functions of knife switches, overcurrent relays, pressure controllers, and undervoltage protection in distribution networks, serving as an integrated thermal relay.
In modern power supply systems and urban grid applications, visualized system data, automation technologies, IoT connectivity, and real-time monitoring require increasingly strict precision standards. Given complex network architectures and widespread automated process control, conventional low-voltage circuit breakers often exhibit high failure rates and no longer meet modern power automation requirements. Intelligent undervoltage protection circuit breakers address these needs with overload/overcurrent protection, multi-functionality, user-friendly operation, high interrupting capacity, and adjustable safety settings.
The core of smart circuit breakers consists of:
● Microcontroller units
● Signal acquisition modules
● Data output devices
● Display/keyboard interfaces
● Communication ports (e.g., Wi-Fi)
● Power supplies
Operation workflow:
● Close main contacts manually or electrically
● Lock the mechanism via trip-free release organization
● Series-connected overcurrent trip coils and thermal elements monitor the main circuit
● Parallel-connected undervoltage coils detect power anomalies
● Trigger trip mechanism during faults (short-circuit/overload) via bimetallic deformation or electromagnetic release
Key features:
● Energy storage indication (manual/electric)
● Remote control via mobile apps
● Auto-reclosing after voltage stabilization
● Test/disconnect positions for maintenance