Ul 489. This variation can have impact on the proper device selection. Ul489 miniature circuit breakers mcbs ensure electrical safety in multiple applications.
Ul 1077 supplementary protectors used for overcurrent protection within appliances or electrical equipment where branch circuit protection is already provided or not required. Definitions from the standard ul 489 mccb on photo abb molded case circuit breakers tmax series by galco the requirements of this standard cover molded case circuit breakers mccb circuit breaker and ground fault circuit interrupters fused circuit breakers and accessory high fault protectors. Ul489 mcbs feature two different tripping mechanisms the delayed thermal tripping mechanism for overload protection and the magnetic tripping mechanism for short circuit protection.
Definitions from the standard ul 489 mccb on photo abb molded case circuit breakers tmax series by galco the requirements of this standard cover molded case circuit breakers mccb circuit breaker and ground fault circuit interrupters fused circuit breakers and accessory high fault protectors.
Ul 1077 supplementary protectors. Ul489 mcbs feature two different tripping mechanisms the delayed thermal tripping mechanism for overload protection and the magnetic tripping mechanism for short circuit protection. Expanded line of circuit breakers that meets crf 46 coast guard requirements suitable for use when ul 489 specifications are required navy army or coast guard vessels and other vessels covered under cfr 46. 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.
