10

Miniature Surface Mount

379

Surface Mount Fuses

www .littelfuse .com

Telecom NANO

®

Test

Voltage Current

Waveform

Repetitions

Fuse

(V)

(A)

Choices

Impulse

For handheld units

2500

62.5

10 x 700

µs+ 10 w/60 sec. rest 0.5, 1.25, 2.0

Non handheld

1500

37.5

10 x 700

µs+ 10 w/60 sec. rest 0.5, 1.25, 2.0

Steady-State

For handheld units

1500

60Hz

0.5, 1.25, 2.0

Non handheld

1000

60Hz

0.5, 1.25, 2.0

Surge

Voltage Waveform Current

Waveform

Reps

Recommended

(V)

(

µs)

(A)

(

µs)

Fuse

Metallic A

800

10 x 560

100

10 x 560

1 ea. polarity

1.25

Longitudinal A

1500

10 x 160

200

10 x 160

1 ea. polarity

1.25

Metallic B

1000

9 x 720

25

5 x 320

1 ea. polarity

1.25

Longitudinal B

1500

9 x 720

37.5

5 x 320

1 ea. polarity

1.25

For the type A events the 0.5 fuse will open, providing non-operational compliance. The 1.25 & 2.0 will not open, providing

for operational compliance with TIA-968-A type A surge events.

TIA –968-A (formerly FCC Part 68) Surge Waveforms

(fuse can not open during type B events)

UL60950 (EN 60950) (formerly UL 1950) Power

Cross (L = longitudinal, M = metallic)

Test

Voltage

Current

Time

Fuse

Number

(V)

(A)

Choices

L1

600

40

1.5 sec.

0.5, 1.25, 2.0

L2

600

7

5 sec.

0.5, 1.25, 2.0

L3

600

2.2

30 min.

0.5, 1.25, 2.0

L4

200

2.2

30 min.

0.5, 1.25, 2.0

L5

120

25

30 min.

0.5, 1.25, 2.0

M1

600

40

1.5 sec.

0.5, 1.25, 2.0

M2

600

7

5 sec.

0.5, 1.25, 2.0

M3

600

2.2

30 min.

0.5, 1.25, 2.0

M4

600

2.2

30 min.

0.5, 1.25, 2.0

Selection of test number depends on current limiting & fire enclosure/spacing of

end product

• 26 AWG line cord removes L1/M1 test requirement

• L5 conducted only if product does not pass section 6.1.2

• L2,M2,L3,M3,L4,M4 conducted if not in a fire enclosure

Fuse must open before the wiring simulator fuse (MDL 2.0).

UL 60950 requirements

UL60950 (EN 60950) (formerly UL 1950)

Impulse Test & Steady-state electric strength test

®