参数资料
| 型号： | 20CJ |
| 厂商： | Cooper Bussmann |
| 文件页数： | 2/20页 |
| 文件大小： | 0K |
| 描述： | FUSE 20A 600V CERAM BODY CSA |
| 标准包装： | 1 |
| 系列： | CJ |
| 保险丝类型： | 快速熔断 |
| 电压 - 额定： | 600VAC，250VDC |
| 电流： | 20A |
| 封装/外壳： | 盒，非标准 |
| 尺寸/尺寸： | 0.811" 直径 x 2.244" L（20.60mm x 57.00mm） |
| 安装类型： | 支座 |
IEC & British Standard Fuses
Application Data for BS Low Voltage Fuses
Max. Fuse Rating (amps)
Capacitor Circuits
Cable Size (mm 2 )
K = 115 K = 143
1
1,5
2.5
4
6
10
16
25
35
50
70
95
120
16 16
20 25*
32* 32*
50* 50*
63* 63*
100* 125*
125* 160*
200* 250*
315* 355*
400* 500
560 630
710 800
800 1000
For power factor correction in capacitor circuits, the fuse
should be chosen with a current rating greater than 1.5 times
the rated capacitor current. This takes into account the high
inrush current, circuit harmonics and capacitor tolerances.
Motor Circuits
In motor circuits, the fuse has to withstand the motor's
starting current and often requires a higher rating than the
motor's full load current. Coordination recommendations are
made by the manufacturers of motor starters in accordance
* Extended Motor Circuit dual ratings can be used.
Protection Against Electrical Shock
For a TN System, a disconnecting time not exceeding 5s is
permitted for a distribution circuit. The maximum values of
earth fault loop impedance (Zs) of 240V for Cooper
Bussmann gG fuses to BS 88: Parts 2 and 6 are:
Rating (A) Zs (Ohms) Rating (A) Zs (Ohms) Rating (A) Zs (Ohms)
6 14 50 1.1 250 0.16
10 7.7 63 0.86 315 0.13
16 4.3 80 0.60 400 0.096
20 3.0 100 0.44 500 0.073
25 2.4 125 0.35 630 0.054
32 1.9 160 0.27 800 0.044
40 1.4 200 0.20
Ambient Temperature
The derating, in terms of current, of 0.5% per °C above an
ambient of 35°C is recommended.
Interrupting Rating
with IEC 60947-4-1. To get Type 2 coordination with fuses,
tests are performed with the latest gG or gM fuses to BS 88
or IEC 60269 that have pre-arcing I 2 t values towards the
bottom of specified limits. This means that Cooper
Bussmann fuses are suitable to provide Type 2 coordination.
Extended dual ratings of motor circuit protection fuses with
gM characteristics are available in most popular fuse sizes to
extend the use of associated equipment with appropriate
economies. In the majority of applications, gG fuses are
used. It is not essential to use gM fuses for motor circuit
protection, they simply extend the utilization of standard
equipment.
Below is a table of recommended fuses at 415V. In most
applications, the run-up time is less than 5 seconds and duty
is infrequent - no more than twice per hour. The next larger
rating should be used for more demanding applications.
Direct On-line
Asst. Start
The standardized interrupting rating values are 80kA for
Standard Motor Circuit
Standard
voltages of 415Vac and above, and 40kA for DC
applications. The 240Vac designs have an interrupting rating
of 50kA.
Coordination Ratio
All fuses to BS 88 Parts 2 and 6 will give a coordination ratio
of 2:1; and for most practical situations a ratio of 1.6:1 (two
steps in the R10 series). Example: an upstream fuse rated at
160A will coordinate with a downstream fuse rated at 100A.
Current and Energy Limitation
The range of fuses have pre-arcing I 2 t values towards the
bottom limits of BS 88 Parts 2 and 6. This ensures excellent
current and energy limitation. They also have lower power
losses at rated current. This assists in the appropriate
interchangeability with other makes of fuses.
Transformers
When fuses are used on the primary side of transformers,
the normal fuse current rating should be at least twice the
nominal transformer primary current.
Fluorescent Lighting
The normal fuse current rating should be at least twice the
normal full load current of the maximum number of lights to
be simultaneously switched.
kW
0.25
0.37
0.55
0.75
1.1
1.5
2.2
3.0
4.0
5.5
7.5
11.0
15.0
18.5
22.0
30.0
37.0
45.0
55.0
75.0
90.0
110.0
132.0
150.0
185.0
200.0
225.0
250.0
280.0
335.0
355.0
Rating Motor
A
0.8
1.1
1.5
2.0
30
3.6
5.0
6.5
8.4
11.0
15.0
20.0
27.0
33.0
38.0
54.0
66.0
79.0
98.0
135.0
155.0
185.0
220.0
250.0
310.0
335.0
375.0
415.0
460.0
562.0
596.0
(gG) (gM)
A A
4 -
4 -
6 -
6 -
10 -
16 -
16 -
20 -
20 -
25 20M25
40 32M40
50 32M50
63 32M63
80 63M80
80 63M80
100 63M100
125 100M125
160 100M160
160 100M160
250 200M250
250 200M250
315 200M315
355 315M400
355 315M400
450 400M500
500 4 00M500
560 -
560 -
630 -
710 -
800 -
(gG)
A
2
2
4
4
6
01
01
61
61
2 20
25
32
40
50
50
80
80
100
100
160
160
200
250
315
355
400
400
450
500
630
710
218
For product data sheets, visit www.cooperbussmann.com/datasheets/ulcsa
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