PC grade and CB grade dual power automatic switch difference
Published:2013-10-25 Publisher:Langming Electrical (Popularity: )
Dual power automatic transfer switch if you choose not to have over-current release load switch is used as the actuator belongs to PC automatic switch. Don"t have the protective function, but it has a higher tolerance and making capacity, can ensure the switch their own safety, do not damage due to overload or short circuit fault, ensure the switch on the circuit and reliable in this case.
PC dual power supply
Will be able to get through, bearing, but not for breaking short-circuit current ATSE
From the people"s Republic of China national standard GB 14048.11-2008
Dual power automatic transfer switch if you choose not to have over-current release load switch is used as the actuator belongs to PC automatic switch. Don"t have the protective function, but it has a higher tolerance and making capacity, can ensure the switch their own safety, do not damage due to overload or short circuit fault, ensure the switch on the circuit and reliable in this case.
CB dual power supply
With the current release of ATSE
It can be switched on and the main contact for breaking short circuit current
From the people"s Republic of China national standard GB 14048.11-2008
Dual power automatic transfer switch if circuit breaker with overcurrent tripping device as the executor is belong to CB automatic switch. Have the protective function of selective, to the lower end of the load and the cable provided with short-circuit and overload protection; the making and breaking capacity is far greater than the use of contactors and relays and other components.
CB dual power supply products and PC grade dual power supply product merits?
Can"t speak generally, to live according to different requirements, technology, manufacturing of products from different manufacturers, quality management and technology. Selectivity is a basic requirement for power distribution system, to the CB level of the products, can be provided according to the manufacturer"s data selection, implementation of selective; PC class products, you need to install the short-circuit current protector into the line in the end of the ATSE: a fuse or circuit breaker, to achieve selectivity requirements. CB level product with its own current fault protection helps to reduce the cost and complexity of the system. For the fire pumps, fire, security and continuity of the power supply equipment compared to no longer be a primary consideration, at the PC level is suitable for. But the lighting load or production process of motor load characteristics, protection class CB products will ensure the continuity of power supply and load security, if the choice of PC products, you must add the overcurrent protection appliances into the line in the end, increase the box size and cost, at the same time fault reclosing state appears easily, expand the influence the scope of the accident. So the CB class products and class PC product selection, depending on the specific application and.
CB level and PC level of ATSE both have the following differences
1, the two different concepts of mechanism design
The CB class is composed of circuit breaker, circuit breaker is to break arc as own duty, requiring agencies to fast tripping. Thus there may be sliding buckle, buckle again unreliable factors; while the PC level mechanism does not exist the problems. The reliability of PC grade products is much higher than that of CB product. Circuit breaker (MCCB) generally do not bear short-time withstand current, the contact pressure on the smaller. When the power supply circuit when short circuit occurs, a breaker moving contact is opened and generates a current limiting function, thereby breaking short circuit current; while the PC level of ATSE 20Ie and above shall bear the overload current, contact pressure of demand is bigger, so the ATSE contact is not easy to be opened, is not easy to be welded. This feature is particularly important for power supply of fire fighting system.
2, two power supply power superposition problem existing in the conversion process.
PC ATSE give full consideration to the factors. Electrical clearance and creepage distance of PC grade ATSE is generally clearances, breaker creepage distance of 180%, 150% (standards). Therefore, better safety grade ATSE PC.
3, the contact angle of different material selection.
Matching circuit breaker often choose silver tungsten and silver tungsten carbide material, which is conducive to the arc, but this kind of contact material easy oxidation, spare contacts exposed for a long time, in its surface easy to hinder the formation of conductive and difficult to drive oxides, when standby contact but put to use, easy to cause the switch increased burn even explosive rise contact temperature; while the PC level ATSE fully considers the consequences of oxide contact materials.
