All you should know about UL489 circuit breaker
What is a UL489 circuit breaker?
UL 489 circuit breakers, commonly referred to as branch circuit protectors, are utilized to protect electrical conductors from the effects of thermal overloads and short circuits.
Use UL 489 circuit breakers to ensure your electrical conductors are properly protected and to deliver power to nearly any type of load including motors, heaters, lamps, etc.
UL489 circuit breaker structure
The structure of a UL489 circuit breaker typically consists of the following components: Enclosure, Contacts, Operating Mechanism, Trip Mechanism, Arc Extinction System, Calibration and Adjustment Mechanisms, etc.
Installation of UL489 circuit breaker
Circuit breaker mountable on standard 35mm DIN rails with optional feet for front-and-bottom mounting. The nut wiring specification of this product is 14-4AWG, and the tightening torque during installation is 3.5N.m.
When to use UL 489, when to use UL 1077？
UL489 circuit breakers protect multiple devices, like control panels. UL 1077 supplementary protectors are for single devices, excluding motors or transformers. Supplementary protectors are used when UL 489 protection isn’t needed.
A UL 489 circuit breaker can act as the sole overcurrent device, while UL 1077 can’t replace it. It’s crucial to note that a UL 489 circuit breaker can replace a UL 1077 supplemental protection device, but the reverse is not allowed – a UL 1077 device cannot be used as a UL 489 branch.
How do UL 489 circuit breakers contribute to electrical system reliability?
UL 489 circuit breakers contribute to electrical system reliability by preventing damage caused by excessive current, minimizing downtime, and protecting equipment from potential hazards.
Can UL 489 circuit breakers be reset after tripping?
Yes, UL 489 circuit breakers are designed to be reset after tripping, allowing for the restoration of power to the protected circuit once the cause of the overcurrent or short circuit has been addressed.
