Introduction to Universal Circuit Breaker Functions: The circuit breaker features a three-dimensional layout; the contact system, instantaneous overcurrent trip unit, and left and right side plates are all mounted on a single insulating board. An arc-extinguishing system is installed in the upper section, while the operating mechanism can be positioned either directly in the front or on the right side; it includes "Open" and "Closed" indicators as well as a manual trip button. A shunt trip unit is mounted in the upper-left section, and an undervoltage trip unit-connected to the trip half-shaft-is located at the rear. Fast-saturating current transformers or current-to-voltage converters are fitted over the lower busbars. Undervoltage time-delay devices, thermal relays, or semiconductor trip units may be installed separately in the lower section.
The DW15-2000, 3200, 4000, and 6300 series circuit breakers also utilize a three-dimensional layout, featuring a frame structure composed of a base frame, side plates, and crossbeams. The contact system for each phase is mounted on the base frame, with the arc-extinguishing chambers positioned above. The operating mechanism is located in the front-right section of the circuit breaker and connects to the contact system via a main shaft. The electric operating mechanism-integrated with the main mechanism via a square shaft-is mounted in the lower section of the circuit breaker; it serves to store energy for the breaker or to perform direct closing operations. Once energy has been stored, the closing operation is actuated by a release electromagnet. An anti-rebound mechanism is installed above the left side plate to prevent the circuit breaker from bouncing during the opening process. Various overcurrent trip units are installed in the lower section of the circuit breaker to meet specific requirements, while the undervoltage trip unit, shunt trip unit, and electric operating control components are located on the left side. Notably, the undervoltage and shunt trip units are connected to an amplification mechanism via the trip shaft, thereby reducing the tripping force required for the circuit breaker.