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POLYFUSE

廬

Resettable PTCs

Radial Leaded

250R Series

Description

鈥?The 250R series is designed to protect against short

duration high voltage fault currents (power cross or

power induction surge) typically found in telecom

applications (250Vrms). The series can be used to help

telecom networking equipment meet the protection

requirements specified in ITU K.20 and K.21.

Features

鈥?RoHS compliant and

lead-free

鈥?Fast time-to-trip

鈥?Binned and sorted narrow

resistance ranges available

Applications

鈥?Customer Premises

Equipment (CPE)

鈥?Central Office (CO)/

Telecom Centers

鈥?LAN/WAN Equipment

鈥?Access equipment

鈥?0.08 鈥?0.18 Hold current

range, 60VDC operating

voltage

鈥?250VAC interrupt rating

Agency Approvals

AGENCY

AGENCY FILE NUMBER

E183209

R50082521

Electrical Characteristics

I

hold

(A)

0.08

0.08

0.12

0.12

0.12

0.12

0.12

0.12

0.12

0.12

0.145

0.145

0.145

0.145

0.18

0.18

C: coated device

Part Number

I

trip

(A)

0.16

0.16

0.24

0.24

0.24

0.24

0.24

0.24

0.24

0.24

0.29

0.29

0.29

0.29

0.65

0.65

V

max

V

int

/ V

op

250/60

250/60

250/60

250/60

250/60

250/60

250/60

250/60

250/60

250/60

250/60

250/60

250/60

250/60

250/60

250/60

I

max

(A)

3

3

3

3

3

3

3

3

3

3

3

3

3

3

10

10

P

d

max.

(W)

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1.8

1.8

Maximum Time

To Trip

Current

(A)

0.35

0.35

1

1

1

1

1

1

1

1

1

1

1

1

1

1

Time

(Sec.)

3

3

1.5

1.0

0.85

0.7

0.8

0.7

1

1.2

2.5

5

2.5

2.0

21

20

R

min

(惟)

15

14

4

7

5.4

6

6

8

8

7

3

3

4.5

5.4

0.8

1.4

Resistance

R

typ

(惟)

22

22

8

9

7.5

10.5

9

10.5

10

12

6

5.5

6

7.5

2.2

3.9

R

1max

(惟)

33

33

16

16

14

16

16

16

16

16

14

12

14

14

4

4.5

Agency

Approvals

250R080T

250R080

250R120

250R120-RA

250R120-RC

250R120-RF

250R120-R1

250R120-R2

250R120-R3

250R120T

250R145

250R145-RA

250R145-RB

250R145T

250R180

250R180T

*typical value

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

T: pre-tripped device

250R Series

Specifications are subject to change without notice.



Electronics Designers Guide

www.littelfuse.com

漏2006 Littelfuse

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