Type C2F

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Bel Fuse Inc.

300 Executive Drive, Suite 300

West Orange, NJ 07052 USA

+1 201.432.0463

Bel.US.CS@belf.com

belfuse.com/circuit-protection

© 2025 Bel Fuse, Inc.

Rev. C2F Feb2025

Temperature Derating Curve

Average Time Current Curve

Electrical Specifications

Part Number

Ampere

Rating

(A)

Marking

Code

Nominal

Cold

Resistance

(ohms)

Maximum

Volt-drop

@100% In

(Volt) max.

Voltage and

Interrupting

Ratings

Nominal

Melting I²T

@10 In

(A² Sec)

Maximum

Power

Dissipation

@100% In

(W)

Agency

Approvals

0686F0300-XX

300mA

F

0.720

0.315

See Table

of Safety

Approvals

on Page 1

for Voltage

and

associated

Interrupting

Ratings

0.00004

0.09

Y

0686F0500-XX

500mA

J

0.430

0.310

0.0003

0.16

Y

0686F0750-XX

750mA

M

0.225

0.230

0.0013

0.17

Y

0686F1000-XX

1A

1

0.150

0.215

0.0028

0.22

Y

0686F1250-XX

1.25A

P

0.110

0.195

0.0045

0.24

Y

0686F1500-XX

1.5A

R

0.088

0.185

0.008

0.28

Y

0686F2000-XX

2A

2

0.060

0.180

0.014

0.36

Y

0686F2500-XX

2.5A

T

0.035

0.115

0.027

0.29

Y

0686F3000-XX

3A

3

0.026

0.110

0.040

0.33

Y

0686F3500-XX

3.5A

Z

0.021

0.103

0.058

0.36

Y

0686F4000-XX

4A

4

0.017

0.100

0.110

0.40

Y

0686F5000-XX

5A

5

0.0135

0.098

0.140

0.49

Y

0686F6000-XX

6A

6

0.0113

0.106

0.210

0.64

Y

0686F7000-XX

7A

7

0.0092

0.107

0.350

0.75

Y

0686F8000-XX

8A

8

0.0075

0.097

0.500

0.78

Y

Consult manufacturer for other ratings

NOTES: Test Conditions

All test for ratings 300mA - 5A were conducted with fuse samples soldered on a PCB (1.6mm thick) test board with copper traces measuring

0.035 mm (35μm) nominal thickness (1 oz.clad), 5mm wide and 100 mm overall length.

All test for ratings 6A-8A were conducted with fuse samples soldered on a PCB (1.6mm thick) test board with copper traces measuring 0.070

mm (70

μm) nominal thickness (2 oz. clad), 7.5mm wide and 100 mm overall length.

Device designed to be mounted with marking facing up.

Device designed to carry rated current for 4 hours minimum. It is recommended that device be operated continuously at no more than 80% of

rated current when in a +25°C ambient, with further derating at elevated ambient temperatures.

Specifications subject to change without notice

0.001

0.01

0.1

1

10

100

0.1

1

10

100

CURRENT IN AMPERES

C2F - TIME CURRENT CHARACTERISTIC CURVE