QOU245 데이터 시트보기 (PDF) - Unspecified

부품명

상세내역

일치하는 목록

QOU245

QOU Miniature Circuit Breakers and Switches Unit Mount (Cable-in/Cable-out)

Unspecified 

QOU Miniature Circuit Breakers and Switches

Application Information

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

20

15

10

9

8

7

6

5

4

3

2

1.5

1

Line Frequency in Hertz

09/2005

11

© 2005 Schneider Electric All Rights Reserved

Share Link: