Type 3SB

2 / 4

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. 3SB Feb2025

Environmental Specifications

Shock Resistance

MIL-STD-202G, Method 213B, Test Condition 1

(100 G's peak for 6 milliseconds; Sawtooth waveform)

Vibration Resistance

MIL-STD-202G, Method 201A (10-55 Hz, 0.06 inch, total excursion).

Salt Spray Resistance

MIL-STD-202G, Method 101E, Test Condition B (48 hrs).

Insulation Resistance

MIL-STD-202G, Method 302, Test Condition A

(After Opening) 10,000 ohms minimum.

Solderability

MIL-STD-202G, Method 208H

Resistance to solder Heat

MIL-STD-202G, Method 210F, Test Condition B (260+/-5

℃,10+/-1 sec)

Thermal Shock

MIL-STD-202G, Method 107G, Test Condition B (-65

℃ to +125℃).

Operating Temperature

-55

℃ to +125℃

Terminal Strength

IEC-68-2-21

Electrical Specifications

Consult manufacturer for other ratings

Catalog

Number

Ampere

Rating

Typical Cold

Resistance

(ohms)

Volt-drop

@100%In

(Volt) max.

Voltage and

Interrupting

Ratings

Melting I²T

<10 mSec

(A²Sec)

Melting I²T

@10 In

(A²Sec)

Maximum

Power

Dissipation

(W)

Agency

Approvals

3SB 500-R

500mA

1.38

1.07

See Table of

Safety Approvals

on Page 1 for

Voltage and

associated

Interrupting

Ratings

4.4

5.4

0.8

Y

Y

3SB 750-R

750mA

0.642

0.68

9

10

0.8

Y

Y

3SB 1-R

1A

0.374

0.59

16

21

0.9

Y

Y

3SB 1.25-R

1.25A

0.248

0.43

25

32

0.9

Y

Y

3SB 1.6-R

1.6A

0.155

0.38

39

50

1.0

Y

Y

3SB 2-R

2A

0.115

0.36

61

79

1.0

Y

Y

3SB 2.5-R

2.5A

0.079

0.29

94

123

1.1

Y

Y

3SB 3-R

3A

0.058

0.27

146

192

1.1

Y

Y

3SB 4-R

4A

0.039

0.23

226

300

1.2

Y

Y

3SB 5-R

5A

0.029

0.22

349

469

1.3

Y

Y

3SB 6-R

6A

0.018

0.19

286

455

1.6

Y

Y

3SB 7-R

7A

0.016

0.18

372

592

1.8

Y

Y

3SB 8-R

8A

0.013

0.17

483

769

1.9

Y

Y

3SB 10-R

10A

0.010

0.17

817

1300

2.3

Y

Y

3SB 12-R

12A

0.008

0.15

1277

2031

2.6

Y

Y

3SB 15-R

15A

0.006

0.15

2123

3377

3.0

Y

Y

Specifications subject to change without notice