The development prospect of circuit breaker UL certification is very good, because it brings more benefits to the enterprise when it is used, so it is favored by customers. In order to let everyone use it more for testing, then we will talk about the small knowledge points related to it, hoping to bring help to more people.
then in the industry field of circuit breaker UL certification, there are two common and frequently used certification methods, their names are UL 489 and UL 1077 respectively. No matter which one of them is the standard of circuit breaker UL certification, this is beyond doubt, everyone recognizes and has been using. So in the choice of how to judge the circuit breaker UL certification is applicable to which standard, this problem is very concerned about the circuit breaker manufacturers. Therefore, we have to look at the differences between the two standards, so that we can see at a glance that there will be no mistakes in the choice. So the next step is to introduce the difference between the two circuit breaker UL certification UL489 and UL 1077 certification. Before choosing them, you must first know what UL 489 and UL 1077 are. In UL 489, the purpose of circuit breakers is to be installed in the circuit breaker enclosure or as part of other equipment, such as service entrance equipment and distribution boards. The UL 1077 is the auxiliary protector of the circuit breaker. That is to say then UL 1077 defines an auxiliary protector as a device used as overcurrent, overvoltage or undervoltage protection in appliances or other electrical equipment that already provides or does not require branch overvoltage protection.
Then, under the UL service of UL certification of circuit breakers, low-voltage air circuit breakers, molded case circuit breakers and miniature circuit breakers can be evaluated and then listed as UL 489. This can be used as an independent product. The UL 1077 is a component that is recognized as a complementary protector. So this means that the investigation of their factory installation in "listed" products continues. Either way, UL 489 and UL 1077 equipment pass a series of calibration, overload, endurance and short circuit tests. And another UL 489 circuit breaker can protect multiple devices at the same time, such as the entire control panel, but the UL 1077 auxiliary protector only protects one device, except for those devices that supply power to the motor or transformer and those that exit the device. Circuit protectors listed in UL 489 in circuit breaker UL certification are usually overcurrent devices that can be used specifically to protect branch circuits and sockets. It does not require the connection of additional spare overcurrent devices. Of course, in these two ways, UL 489 circuit breakers can be used instead of UL 1077 supplementary protection devices.