521 Quick-Acting Miniature Fuse

BETTER ELECTRONICS
TECHNOLOGY CO., LTD.

东莞市贝特电子科技股份有限公司

www.betterfuse.com

China sales:

Jacky Huang

sls01@betterfuse.com

+86 769-83238731 ext.859

Japan sales:

Erin

oss01@betterfuse.com

+86-769-2307 8202

Europe sales:

Helge Glueck

helge@betterfuse.com

+49-341-946 98772

South Korea sales:

Jenny Li

sm12@betterfuse.com

+86 769-2307 8212

20±0.5

Φ

5.

2

+0.1 -0

.2

5,25±0,2

Main Characteristics

Cartridge Miniature fuse; Quick-Acting(F)

Standard

IEC 60127-2/

Ⅱ

Materials

Tube:

Glass Tube

End Caps:

Nickel-plated brass

Axial Leads: Nickel-plated caps

Tin-plated copper wires

Operating Temperature

-55

℃

to +125

℃

Storage Conditions

+10

℃

to +60

℃

Relative humidity:≤75% yearly average
without dew, maximum 30 days at 95%

Vibration Resistance

24 cycles at 15 min. each (60068-6)
10-60Hz at 0.75mm amplitude
60-2000Hz at 10g acceleration

Soldering Parameters

260

℃

.

≤

5 sec (Wave Soldering)

350

℃

.

≤

3 sec (Hand Soldering)

Soldering Peak:
260

℃

. 10 sec. (IEC 60068-20)

0.01

0.1

1

10

100

1000

0.10

1.00

10.00

100.00

1000.00

T

IM

E

 

IN

 S

E

C

ON

DS

CURRENT  IN AMPERES

0.

25

A

0.

315

A

0.

5A

0.

63

A

0.

8A

1A

1.

6A

2A

2.

5A

3.

15A

4A

5A

6

.3

A

8A

10

A

12.

5A

1

6A

Note

: (1) Permissible continuous operating current is 100% at ambient temperature of 23°C (73.4°F)

(2)The cURus certification by 125V and 250V; the VDE certification with 8A~10A by 125V; the others certification by 250V.

Time vs Current Characteristics: IEC 60127-2/

Ⅱ

Rated Current

150%

210%

275%

400%

1000%

250mA~6.3A

>1h

<30min

50ms-2s

10ms-300ms

≤20ms

8A~10A

>1h

<30min

50ms~2s

10ms~400ms

≤40ms

12.5A~16A

>30min

<30min

50ms~3s

10ms~400ms

≤50ms

Electrical Characteristics

Amp

Code

Rated

Current

Rated

Voltage

Max.

Voltage

Drop (mV)

Max. Power

Dissipation

(W)

Nominal

Melting

I²t(A²sec)

Breaking

capacity

Approvals

cURus

CQC

VDE

PSE

CCC

0250

250mA

125V AC
250V AC

1400

1.6

0.0256

10kA/125VAC
100A/250VAC

50-60Hz

Cosφ=0.7~0.8

○

○

○

○

○

0300

300mA

1300

1.6

0.1035

○

○

○

○

○

0315

315mA

1300

1.6

0.1089

●

○

●

○

●

0350

350mA

1300

1.6

0.1717

●

○

○

○

○

0375

375mA

1300

1.6

0.2058

●

○

○

○

○

0400

400mA

1200

1.6

0.24

●

○

○

○

●

0500

500mA

1000

1.6

0.1681

●

○

●

○

●

0630

630mA

650

1.6

0.7225

●

○

●

○

●

0750

750mA

240

1.6

0.813

●

○

○

○

○

0800

800mA

240

1.6

0.757

●

○

●

○

●

1100

1.00A

200

1.6

1.64

●

○

●

●

●

1125

1.25A

200

1.6

2.56

●

○

●

●

●

1150

1.50A

190

1.6

3.76

●

○

○

○

○

1160

1.60A

190

1.6

4

●

○

●

●

●

1200

2.00A

170

1.6

5.76

●

○

●

●

●

1250

2.50A

170

1.6

9.61

●

○

●

●

●

1300

3.00A

150

2.5

13.88

●

○

○

○

○

1315

3.15A

150

2.5

20.7

●

○

●

●

●

1350

3.50A

150

2.5

21.3

●

○

○

○

○

1400

4.00A

130

2.5

22.09

●

○

●

●

●

1500

5.00A

130

2.5

40.96

●

○

●

●

●

1630

6.30A

130

2.5

70.56

●

○

●

●

●

1700

7.00A

130

2.5

105.5

●

○

○

○

○

1800

8.00A

130

4

163.8

●

●

●

●

○

2100

10.00A

130

4

272.2

●

●

●

●

○

2150

12.50A

100

6

702.25

○

●

○

○

○

2160

16.00A

100

6

1332.3

○

●

○

○

○

Series

Amp Code

Supplementary Code

Qty

521

RoHS

Dimensions

(units in mm)

21.5±1.0

30

+1
-0

Max:6.0

Φ

0

.65/0.

8

0±0.

1

★

Note：★
250mA～7.0A ： 

Φ

0.65mm

8.0A～10A ：   

Φ

0.80mm

Ordering Information

Average Time Current (I-T) Curves

Note:
250mA~7.00A

：

Φ0.65mm

8.00A~12.50A:

Φ0.80mm

16.00A:

Φ1.00mm