How are the ratings on circuit breakers determined? i have a science project(actualy a crap load of questions) due tuesday and thts one of them, i cant find it online anywhere
plz and thnk u!
2006-11-17 08:59:38 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Botany
International Standard IEC 60898-1 and European Standard EN 60898-1 define the rated current In of a circuit breaker for household applications as the current that the breaker is designed to carry continuously (at an ambient air temperature of 30 °C). The commonly-available preferred values for the rated current are 6 A, 10 A, 13 A, 16 A, 20 A, 25 A, 32 A, 40 A, 50 A, 63 A, 80 A and 100 A (Renard series, slightly modified to include current limit of British BS 1363 sockets). The circuit breaker is labeled with the rated current in ampere, but without the unit symbol "A". Instead, the ampere figure is preceded by a letter "B", "C" or "D" that indicates the instantaneous tripping current, that is the minimum value of current that causes the circuit-breaker to trip without intentional time delay (i.e., in less than 100 ms):
Type Instantaneous tripping current
B above 3In up to and including 5In
C above 5In up to and including 10In
D above 10In up to and including 20In
2006-11-17 09:02:43 · answer #1 · answered by a_blue_grey_mist 7 · 0⤊ 0⤋
Look here....
http://66.102.7.104/search?q=cache:hH3Ws7Il3GEJ:ecatalog.squared.com/techlib/displaydocument.cfm%3Fid%3D0613DB0301%26action%3Dview+determining+circuit+breakers&hl=en&gl=us&ct=clnk&cd=2
2006-11-17 09:04:22 · answer #2 · answered by chloe1995 3 · 0⤊ 0⤋
arent questions you get given covered in class?
2006-11-17 10:13:41 · answer #3 · answered by SAINT G 5 · 0⤊ 0⤋
i unno look at tha net
2006-11-17 09:06:58 · answer #4 · answered by Anonymous · 0⤊ 1⤋