The difference between two section and three section dual power switch

According to the national standard of dual power supply, Dual power supply The level of automatic transfer switch is divided into PC level and CB level, rather than the two section type and three section type.

The so-called two section type and three section type actually refer to the switching contact of dual power supply. The two section type only has two groups of common power supply contact and standby power supply contact, while the three section type also has one more middle zero point which belongs to the absolute disconnection state.

Generally speaking, there are only two switching states of two-stage power supply, namely, common power supply and standby power supply; The three-stage mode is three switching modes: common power supply, full intermediate position and standby power supply. When the equipment needs to be overhauled or the power supply is completely disconnected for testing, the three-stage mode is a better choice.

Delixi Most of the dual power switch CDQ series are two-stage. If you need a three-stage type, please choose CDQ1F dual power switch 。