Automatic transfer switching equipment

Update date:2018-07-19 Source:MAXGE

Automatic transfer switching equipment

The dual power switch is also called TSE, if it is automatic switching. Then add AUTO. This article explains the dual power automatic switch, so use ATSE instead.

The main role of ATSE: to provide two-way power supply conversion for the load. When an abnormality occurs in one power supply. The load can be connected to another power source. The dual-power automatic switch in use at this stage is mainly divided into two types: PC level and CB level.

PC-class dual power supply: Dual power supply capable of carrying and switching, but not used to break short-circuit current. The PC-class dual power supply uses a load switch that does not have an overcurrent release as an actuator. Does not have protection. However, it has a high tolerance and connection capability to ensure the safety of the switch itself. It will not be damaged by faults such as overload or short circuit. A reliable loop connection is guaranteed.


CB-class dual power supply: equipped with an overcurrent release, its main contacts can be switched on and used to break the short-circuit current. With selective protection. Provides short-circuit and load protection for the lower load and cable. Its ability to switch on and off is much greater than using other components such as contactors and relays.

The difference between CB level and PC level: CB level is composed of circuit breaker, and the function of circuit breaker is to break the arc. The agency is required to quickly trip. Therefore, a slider may appear. Unreliable factors such as deduction. This problem does not exist at the PC level. PC level reliability is greater than CB level. The circuit breaker is generally not subjected to short-time withstand current and the contact pressure is small. When the power supply line is short-circuited. The moving contact of the circuit breaker is distracted to generate a current limiting function. Thereby breaking the short circuit current. The PC stage withstands 20 times Ie and above overload current. Contact pressure requirements are large. The contacts are not easily detached and are not easily welded. Suitable for fire power supply systems.


How to choose CB level and PC level:

Need to be based on site requirements, power distribution system. The CB level can be selected according to the data given by the manufacturer, and the PC level needs to be equipped with a short-circuit current protector, a fuse or a circuit breaker at the ATSE incoming end. To ensure functional selectivity. CB-class products come with current fault protection, which helps reduce cost and system complexity. For lighting load and motor load during production. The CB level is more suitable. Power continuity and load safety are guaranteed. For fire pump loads, equipment safety and power continuity are not the primary conditions when a fire occurs, so the PC level is more appropriate.

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