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參數(shù)資料
| 型號： | BLC090-1 |
| 廠商： | FUJI ELECTRIC CO LTD |
| 元件分類： | 保險(xiǎn)絲 |
| 英文描述： | SUPER FAST BLOW ELECTRIC FUSE, 90A, 550VAC, 100000A (IR), INLINE/HOLDER |
| 文件頁數(shù)： | 3/12頁 |
| 文件大小： | 809K |
| 代理商： | BLC090-1 |
Fuji Electric FA components & Systems Co., Ltd./D & C Catalog
Information subject to change without notice
08/45
08
I Application and selection guide
BLC, CR and CS-type – Super rapid
fuse
When selecting fuses for
semiconductor rectifier circuit protection
the following conditions must be
satisfied.
For additional details contact FUJI.
I Conditions of application
1. The rated interrupting current of the
fuse must be greater than the
estimated short circuit current of the
circuit.
Available short
Rated interrupting
circuit current
current of fuse
of rectifier circuit
2. The let-thru current value of fuse
must be less than the allowable 1/2
cycle surge current value.
Semiconductor – 1/2
Fuse let-thru
cycle allowable surge
current value
current 10ms (at 50Hz)
3. The total clearing I2t value which the
fuse requires to complete interruption
must be less than the allowable I2t
value of semiconductor.
Fuse – total
Semiconductor – I2t
clearing I2t
4. The rated current of the fuse must be
greater than the average forward
current of the semiconductor.
Fuse –
Semiconductor –
rated current
average forward current
5. The rated current and voltage of the
fuse must be greater than those of
the rectifier circuit.
Fuse – rated
Rectifier circuit –
current and
current and voltage
voltage
Method of application
Semiconductor rectifier equipment has
a variety of rectifier circuits. Taking the
3-phase bridge rectifier circuit as an
example – Fig. (a) and (b) as shown in
the following.
Although the number of fuses used in
the line fuse method (a) is half the
number used in the element fuse
method (b), the fuses must have a
larger current capacity.
Fig. (a)
Line fuse method
In this method the fuses are connected to
the AC line side.
Fig. (b)
Element fuse method
In this method the fuses are connected in
series to the semiconductor element.
I Fuse ratings
When selecting fuses various factors
such as protection, coordination and
load, etc. must be considered.
However, in this catalog the main
matters such as voltage, current and I2t
only are explained.
G
Rated voltage
The rated voltage of the fuse indicates
the maximum operational voltage and
this also indicates the root-mean-
square value of the AC sinusoidal wave
voltage. Select fuses having a rated
voltage exceeding the voltage obtained
by the formula shown in the following
table. (Fig. 1)
Do not select current-limiting fuses with
rated voltages drastically exceeding the
rectifier circuit voltage. It is necessary
to consider the arc voltage.
>
=
>
=
>
=
>
=
>
=
>
=
Fig. 1 Rated voltage required by fuses
Wire connection
Wiring diagram
Rated voltage of Fuse (VFN rms)
type
For line fuse
For element fuse
Single-phase bridge
VFN
a Ea
VFN
a Ea
3-phase bridge
VFN
a Ea
VFN
a Ea
3-phase, double star
VFN
a 3 Ea
VFN
a 3 Ea
Remarks: The 'a' is a coefficient where the regulation of the AC input voltage is taken into account. This
is a=1.1 in case of voltage regulation ±10%.
Fig. 2 Element current and line current
Wire connection
Wiring diagram
Element fuse method
Line fuse method
type
Element current Ia
Line current
Single-phase bridge
3-phase bridge
3-phase, double star
<
=
<
=
>
Low Voltage Fuses
BLC, CR and CS types
Super Rapid Fuses
Ea
Ia
Id
I
Ia =
I = d
= 0.707d
Id
√
_
2
_
Ia =
= 0.577dI
Id
√
_
3
_
I=
Id
= 0.816dI
2
3
I = Ia =
= 0.289dI
Id
2
√
_
3
_
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