The KT4250-3 is a type-tested withdrawable air circuit breaker from ABB. It is rated at 63A and has a short-circuit breaking capacity of 25 kA at 400V AC. It is designed to be used in domestic, commercial and industrial applications. The breaker is designed to range across various systems up to 240 V AC. It may be installed in control cabinets, NEMA type 1 & 12 UL 489 listed enclosures and can be operated in an ambient temperature range between -40°C and 80°C. The KT4250-3 has an arc extinguishing technology which offers quick response time, high short circuit breaking capacity and improved selectivity. It has a number of adjustable settings such as trip time delays, sensitivity levels, open and close voltage and current levels. The KT4250-3 also has a wide range of accessories available, such as auxiliary contact kits, shunt trips and alarm contacts, which can expand the functionality of the breaker.