On circuit breakers ul 489 of ratings below 25 amps the overload current is especially severe due to the 150 amp minimum versus the normal six times rating.
Circuit breaker ratings and specifications pdf.
Joe rostron southern states llc abstract this paper explains the asymmetrical short circuit interrupting current rating for high voltage circuit breakers.
Available up to 600a with interruption capacities up to 200kaic global approvals compact size common internal accessories and a broad range of improved external accessories spectra rms electronic trip 15 to 1200a.
Interrupting ratings circuit breaker type number of poles ampere rating ul listed interrupting rating1 1 10 ka and 5 ka are 1ø 3ø.
The oil circuit breakers have a specified limit of 3 seconds when the ratio of symmetrical breaking current to the rated normal current does not exceed 40.
Voltage ratings 240 440v ac.
Isobar 4 pan assemblies.
Circuit breaker ratings a primer for protection engineers bogdan kasztenny schweitzer engineering laboratories inc.
Circuit breaker performance record plus molded case circuit breakers offer a new standard of performance.
Refer to square d data bulletin 0601db0401 for additional information on dc rated circuit breakers.
The short time rating of a circuit breaker ratings depends upon its ability to withstand a the electromagnetic force effects and b the temperature rise.
Kw 3 phase ac 3 1 cat.
3 phase hp ratings 1 max.
10ka bs en 60947 2.
Higher short circuit capacities up to 25ka are.
Within its rating circuit breakers protect against overloads in conductors and protects against short circuits in connected apparatus such as motors and motor starters.
Breaking capacity bs en 60898.
Circuit breakers are designed for use in panelboards switchboards motor control centers control panels.
Dc voltage rating qo and qob circuit breakers are available with a ul listed 48 vdc rating.
All breakers are tested to this value which represents usage on inductive motor starting applications.
Miniature circuit breakers ratings 1 to 63a breaking capacity 15ka 12 installation symmetrical din rail.
The manufacturer must however declare the short circuit capacity of the products at specified power factors of test circuit.
400v icu 480v group motor 200v 230v 460v 575v 230v 400 415v 500v 690v c frame.
Short circuit current ka max.
Technical data current ratings 1 to 63a at 300c to bs en60898.
