The difference between cb and pc dual power supplies

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List of contents for this article:

• 1、Dual power automatic transfer switches are divided into PC level and CB level. How to distinguish the two? How to choose?
• 2、What is the difference between cb-level and pc-level dual power automatic change-over switches?
• 3、Dual power switch, pc level or cb level, which is easy to break

Dual power automatic transfer switches are divided into PC level and CB level. How to distinguish the two? How to choose?

PC level: Short switching time (usually ≤0.3 seconds), meeting time-sensitive load requirements such as evacuation lighting. CB level: The switching time is long (due to the need for circuit breakers) and may not be suitable for scenarios requiring ultra-short switching times. Whether short circuit protection is needed PC level: No short circuit protection function, additional circuit breakers are required.

Class CB: It may be affected by short-circuit current during the conversion process, and special attention should be paid to electrical safety. Selection reliability requirements If the reliability requirements are high, it is recommended to choose PC-level ATSE. Because the mechanism design of the PC-level ATSE is simple, its reliability is higher than that of the CB-level ATSE. Action time requirements For loads that require rapid switching (such as evacuation lighting), it is recommended to choose PC-level ATSE.

Automatically switch to backup power supply to ensure continuous operation of the equipment. ATSE is mainly divided into PC level and CB level, and there are significant differences in functions and applications between the two. Differences between PC level and CB level Functional characteristics of PC level ATSE: PC level ATSE can connect and carry normal current and fault current, but is not suitable for breaking short circuit current. Its main function is to achieve reliable conversion between power supplies without involving the interruption of short-circuit current.

The PC level and CB level in the dual power automatic transfer switch are mainly distinguished by function and design. When selecting, specific application requirements, reliability requirements and design specifications need to be considered. Differentiation: PC-level ATSE: It is mainly used to connect and carry normal and fault currents, but does not have the ability to break short circuit. Its design focuses more on reliability and fast switching, and is usually used in situations where action time is strict.

In civil buildings and other occasions, ensuring the continuity and reliability of power supply is crucial, and dual power supply automatic transfer switches (ATSE) are particularly important at this time. It can automatically switch to backup power supply when power is interrupted, ensuring the normal operation of important equipment such as elevators, fire protection systems and monitoring equipment. Dual power automatic transfer switches are divided into PC level and CB level. The main difference between them lies in function and design.

The CB-level transfer switch is equipped with an overcurrent release, and its main contact can be connected and used to break short circuit current, with overload and short circuit protection functions. It is suitable for non-important load occasions such as building power distribution, lighting, and fire protection, as well as occasions such as industrial markets, high-speed rail and railway projects, and even in occasions with bus couplings. The plot symbols of CB-level transfer switches are different from those of PC-level.

What is the difference between cb-level and pc-level dual power automatic change-over switches?

The PC-level and CB-level dual power automatic transfer switch are mainly distinguished by functional positioning, institutional design, short-circuit tolerance, etc. The selection needs to be comprehensively judged based on the load type, reliability requirements, action time, protection requirements, etc. The following is a specific analysis: The difference between PC level and CB level is different. PC level is only used to connect and carry normal and fault currents (such as short circuit currents), and does not have the ability to break short circuit currents.

PC-level and CB-level dual power automatic change-over switches can be distinguished by the following aspects: Structure consists of PC-level: The structure is relatively simple and does not consist of two circuit breakers. It has relatively few moving parts, and this simple structure makes it have a relatively low probability of failure during operation, thus ensuring high reliability.

Plotting symbol: Selection key points for dual-power automatic transfer switch Selection ability of PC-level ATSE to withstand short circuit current: PC-level ATSE should be able to withstand expected short circuit current. Specific assessment parameters include lcw (time to withstand short circuit current) and lcm (peak value of withstand short circuit current). Rated current: The rated current of the ATSE should be no less than 125% of the calculated current to ensure stable operation under normal load.

Dual power switch, pc level or cb level, which is easy to break

CB-class dual power switches have a higher probability of failure than PC-class dual power switches. Working principle differences PC-class dual power switches rely on electromagnetic force to drive contacts to complete power switching. They only have power conversion functions and have no overload or short circuit protection modules. The action logic is simple and direct., less affected by additional complex components.

The failure rate of PC-level dual power switches is relatively lower, and the failure rate of CB-level dual power switches is relatively higher. The reason why the PC-level dual power switch has a lower failure rate is that it relies on the contact conversion of the mechanical interlocking mechanism to achieve power switching. The overall structure is relatively simple, without too many complex protection functions and tripping devices, with fewer fault points, and at the same time, it is affected by short-circuit current. The impact of external factors such as impact and electromagnetic interference is also smaller, so the overall failure rate is low.

Class cb-level dual power switch is more likely to damage the action logic and loss differences than class pc-level dual power switch. Class cb-level dual power switch consists of two circuit breakers with a mechanical interlocking device. Each switching requires a complete operation of opening and closing. When switching with load, a strong arc will be generated to burn the contacts. At the same time, there are more mechanical interlocking linkage parts, which is prone to jamming and wear after long-term high-frequency action.

CB-level dual power switches are more likely to experience differences in operating principles than PC-level dual power switches-PC-level dual power switches are only responsible for power switching, do not have overcurrent trip protection, have a simple and single structure, and have no complex control circuits and additional electronic components., fewer fault points and higher operating reliability.

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