Electrical Installation
QFE
page 2-22
FD8413 issue03_F
2.10
Fuse and Current Ratings
2.10.1
Full-Load, Current Limit and Short-Circuit Protection
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2
1
These fuses are for short circuit protection of the semiconductors and must be mounted
externally by the user between the unit and the mains supply.
UL requires Recognized special purpose fuses (JFHR2), for the protection of semi-conductor
devices, rated 700 Vac, as indicated in Table 2.10.1, be used to obtain the short circuit
ratings required by UL.
Suitable for use on a circuit capable of delivering not more than the RMS Symmetrical Amperes
indicated in Table 2.10.1 at maximum rated operational voltage, when protected by
Semiconductor Fuse type, Manufactured by Company and Mod. No. indicated in Table 2.10.1
Fuse rated 700 Vac, Amps as indicated in Table 2.10.1.
It is the responsibility of the installer and system designer/specifier to ensure that the required
standards or regulations are not affected by so doing.
2.10.2
External Fuse Requirements
The rating of HRC fuses for motor protection needs to be carefully analysed when using a
Soft Starter due to the longer start times which are involved. When high inertia loads (e.g.
fans) are being started, special consideration should be given to fuse ratings due to the
extended ramping times. Most fuse manufacturers have an “extended start” or “dual element”
range of fuses intended for this type of application.
For semiconductor protection fusing, refer to the table in section 2.10.1 above.
QFE9
QFE16
QFE23
QFE30
QFE44
QFE59
QFE72
QFE85
QFE105
QFE146
QFE174
QFE202
QFE242
QFE300
QFE370
QFE500
QFE600
QFE750
QFE900
Summary of Contents for QFE Series
Page 18: ...Mechanical Installation QFE page 1 2 FD841205_F...
Page 26: ...Mechanical Installation QFE page 1 10 FD841205_F...
Page 43: ...QFE page 2 19 Electrical Installation FD8413 issue03_F...
Page 50: ...Electrical Installation QFE page 2 26 FD8413 issue03_F...
Page 51: ...QFE Soft Start Motor Controller Technical Data for the QFE and QFEplus Applications...
Page 73: ...QFE page 3 25 Applications FD841405_F...
Page 158: ...page 5 47 Programming QFE FD8420 issue02_F This page is left intentionally blank...
Page 181: ...Modbus page 6 4 5MC FD510007...
