Emerson VE3007 Controller Emerson, Shanghai Sijian Intelligent Technology Co., Ltd. is engaged in technology development, technology consulting, technology services, technology transfer in the fields of intelligent technology, information technology, and automation technology, as well as electrical equipment, automation equipment, electronic products, communication products, electromechanical products, and computer software development. In the generation, transmission, and use of electricity, power distribution is an extremely important link. The power distribution system includes transformers and various high and low voltage electrical equipment, with low voltage circuit breakers being a widely used electrical device. Contactors are divided into AC contactors (voltage AC) and DC contactors (voltage DC), and they are applied in power generation, distribution, and electricity consumption. Broadly speaking, a contactor refers to an electrical device in industrial electricity that uses a coil to generate a magnetic field when current flows through it, causing the contacts to close, thereby controlling the load. Circuit breakers serve a protective function, capable of extinguishing arcs and having breaking capacity.

Emerson VE3007 Controller Emerson contactors use coils to control the circuit's on/off state. When the contactor is energized, the normally open contacts close, and the normally closed contacts open, thus achieving control. High voltage uses circuit breakers, while low voltage uses air switches, but this distinction is not entirely accurate. Strictly speaking, circuit breakers can be high voltage, medium voltage, or low voltage circuit breakers. Air switches are actually one type of circuit breaker among various kinds. Circuit breakers include vacuum circuit breakers and SF6 circuit breakers, which have higher breaking currents and larger breaking capacities compared to ordinary air switches. Vacuum circuit breakers are generally used in 6KV systems, while SF6 circuit breakers are used in 500KV substations. Both use DC 110V as the control power source and are triggered by control signals to operate. Ordinary air switches are used in 380/220 systems, functioning similarly to knife switches.