Ul 489. Bulletin 1489 a influence of ambient temperature t on load carrying capacity bulletin 1489 ambient temperature derating calibration temperature 40º c ul application below 0º c is for non condensing atmosphere. Ul489 mcbs feature two different tripping mechanisms the delayed thermal tripping mechanism for overload protection and the magnetic tripping mechanism for short circuit protection.
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However ul 1077 devices are only acceptable for providing supplementary protection where there is branch circuit protection ahead of it. October 24 2016 ansi approved. Ul 1077 supplementary protectors used for overcurrent protection within appliances or electrical equipment where branch circuit protection is already provided or not required.
Ul 1077 supplementary protectors used for overcurrent protection within appliances or electrical equipment where branch circuit protection is already provided or not required.
This variation can have impact on the proper device selection. Ul 489 circuit breakers are intended for installation in a circuit breaker enclosure or as parts of other devices such as service entrance equipment and panelboards they are regularly required on panel designs per the national electrical code. Ul 489 circuit breakers used for branch circuit protection internal external receptacles external motors and hacr equipment heating air conditioning and refrigeration. October 24 2016 ansi approved.
