UL 489 circuit breakers
Used for branch circuit protection, internal/external receptacles, external motors and HACR equipment
(heating, air conditioning and refrigeration).
UL 1077 supplementary protectors
Used for overcurrent protection within appliances or electrical equipment, where branch circuit protection
is already provided or not required.
Note: UL 489 devices can be used in place of UL 1077; UL 1077 devices cannot be used in place of UL 489.
Download the UL489 and UL1077 Din Rail Miniature Circuit Breakers Catalog Pages in *.pdf format