All you should know about UL489 Miniature circuit breaker
Yes, UL489 circuit breakers can be manually reset after a trip. Once the fault condition is cleared, the circuit breaker can be reset by moving the operating mechanism to the “ON” position. However, it is important to investigate and resolve the cause of the trip before resetting the circuit breaker.
Yes, UL489 circuit breakers are commonly used in three-phase electrical systems. They can provide overcurrent protection for each phase and are available in configurations suitable for three-phase applications. It is important to select the appropriate voltage and current ratings to meet the specific requirements of the three-phase system.
Yes, UL489 circuit breakers can be used in combination with other protective devices, such as fuses or residual current devices (RCDs), to provide additional layers of protection. These devices can supplement the overcurrent protection provided by UL489 circuit breakers and provide specialized protection against certain types of electrical faults.
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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.
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.
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.
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.
UL 489 circuit breakers contribute to electrical system reliability by preventing damage caused by excessive current, minimizing downtime, and protecting equipment from potential hazards.
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.
