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QOU240VH Datasheet(PDF) 11 Page - List of Unclassifed Manufacturers |
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QOU240VH Datasheet(HTML) 11 Page - List of Unclassifed Manufacturers |
11 / 32 page QOU Miniature Circuit Breakers and Switches Application Information 11 09/2005 © 2005 Schneider Electric All Rights Reserved Interrupting Rating (AIR) at 400 Hz. At frequencies above 60 Hz, the interrupting rating of thermal-magnetic circuit breakers is less than the 60 Hz interrupting rating. Unless specifically marked for use of 400 Hz systems, the interrupting rating of Square D circuit breakers is reduced to 1/10th of the 60 Hz interrupting rating. Magnetic Tripping Performance At frequencies above 60 Hz more current is necessary to magnetically trip a circuit breaker than at 60 Hz. Fig. 3 shows the multipliers of 60 Hz current that it takes to instantaneously trip a circuit breaker when applied at various frequencies. For example, at 60 Hz, it takes 700 A or more to magnetically trip a 100 A QOU circuit breaker per trip curve 730-7 (page 26). At 400 Hz, it takes 1820 A (2.6 multiplier) or more to magnetically trip the same circuit breaker. Figure 5: 60 Hz Current Multiplier 1 1.5 2 20 15 10 9 8 7 6 5 4 3 Line Frequency in Hertz |
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