+86 13223710057

Zhengzhou, Henan Province, China

Single-phase vs. three-phase: what is the difference?

Home > Single-phase vs. three-phase: what is the difference?

Single-phase vs. three-phase: what is the difference?

2022-11-10 10:28:01

AC power can be divided into single-phase and three-phase. In general, single-phase power is used where the electricity demand is low. In short, single-phase is usually used to run small equipment, while three-phase has a high electrical load and can run large machinery in factories. The main difference between single-phase and three-phase is that the former is used for domestic power and the latter is used to run heavy machinery. Below I will introduce the differences between them in more detail.

  1. In a single-phase connection, the current passes through a single conductor. A three-phase connection consists of the three separate conductors required to transmit the electricity.
  2. In a single-phase supply system, the voltage can be up to 230 V. In a three-phase connection, however, it can withstand voltages of up to 415 V.
  3. To smooth the current over a single-phase connection, two separate wires are required, one representing the neutral and the other the single phase, which is necessary to complete the circuit. In a three-phase connection, the system requires a zero wire and a three-phase wire to complete the circuit.
  4. More power is transmitted on a three-phase connection than on a single-phase supply.
  5. As a single-phase connection has only one phase wire, if the network fails, the entire power supply will be interrupted. However, in a three-phase power supply, if any change occurs in one phase, the other phases will still work.

Which one is better? Single-phase or three-phase?

For practical applications, the choice of phase number needs to be judged by your needs. If you are only using it for domestic and residential use, a single-phase power supply requires only a small amount of power to run your mobile devices and household appliances for your daily needs. However, when you are running three or four air conditioning units, double-door refrigerators, and extra-large washing machines at the same time, it is recommended that you use a three-phase power supply to properly distribute each load.


Both single-phase and three-phase power supplies have their characteristics. Generally speaking, the choice of single-phase or three-phase power supply is based on your use environment, the use of demand as a starting point for consideration, there is no best, only more suitable for you.

Call Us or Fill the Form

Don’t hesitate to contact us
Don’t hesitate to contact us
Henan Provice China