Three-phase power and AC contactor

Is a three-phase AC power delivery of the form, referred to as three-phase power. Three-phase AC power, is composed of three same frequency, the same amplitude, the phase difference of 120 ° turn each Voltage stabilizer of AC potential supply. Three-phase alternating various purposes, most of the exchanges of industrial electrical equipment, such as motors are three-phase Circuit breaker current, which is often referred to a three-phase four-wire system. In daily life, more use of single-phase power, also known as power transformers. When lighting power supply, one of them with three-phase power supply relative electrical equipment, such as home appliances, and another one line is out of the fourth phase four-wire lines, which is one of the zero line, the zero line from the neutral point of the three-phase power leads.