Littelfuse 250R Series Manual do Utilizador descarregar pdf

Revised: August 31, 2011

POLY-FUSE

Resettable PTCs

250R Series

Radial Leaded > 250R Series

Speciﬁcations are subject to change without notice.

Please refer to www.littelfuse.com/series/250R.html for current information.

250R Series

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.

Electrical Characteristics

Part Number

hold

(A)

trip

(A)

max

int

/ V

max

(A)

typ.

(W)

Maximum Time

To Trip

Resistance

Agency

Approvals

Current

(A)

Time

(Sec.)

min

(Ω)

typ

(Ω)

1max

(Ω)

250R080 0.08 0.16 250/60 3 1 0.35 3 14 22 33

250R080T 0.08 0.16 250/60 3 1 0.35 3 15 22 33

250R120 0.12 0.24 250/60 3 1 1 1.5 4 8 16

250R120-RA 0.12 0.24 250/60 3 1 1 1.0 7 9 16

250R120-RC 0.12 0.24 250/60 3 1 1 0.85 5.4 7.5 14

250R120-RF 0.12 0.24 250/60 3 1 1 0.7 6 10.5 16

250R120-R1 0.12 0.24 250/60 3 1 1 0.8 6 9 16

250R120-R2 0.12 0.24 250/60 3 1 1 0.7 8 10.5 16

250R120-R3 0.12 0.24 250/60 3 1 1 1 8 10 16

250R120T 0.12 0.24 250/60 3 1 1 1.2 7 12 16

250R145 0.145 0.29 250/60 3 1 1 2.5 3 6 14

250R145-RA 0.145 0.29 250/60 3 1 1 5 3 5.5 12

250R145-RB 0.145 0.29 250/60 3 1 1 2.5 4.5 6 14

250R145T 0.145 0.29 250/60 3 1 1 2.0 5.4 7.5 14

250R180 0.18 0.65 250/60 10 1.8 1 21 0.8 2.2 4

250R180T 0.18 0.65 250/60 10 1.8 1 20 1.4 3.9 4.5

Items with T at end of part number = pre-tripped device. See Part Ordering Number System section of this data sheet for additional information.

Description

Features

Applications

toIPMEDVSSFOU

range, 60VDC operating

voltage

t7"$JOUFSSVQUSBUJOH

t'BTUUJNFoUPUSJQ

t#JOOFEBOETPSUFEOBSSPX

resistance ranges available

t3P)4DPNQMJBOU-FBE

'SFFBOE)BMPHFO'SFF

t$VTUPNFS1SFNJTFT

Equipment (CPE)

t$FOUSBM0GmDF$0

telecom centers

t-"/8"/FRVJQNFOU

t"DDFTTFRVJQNFOU

250R Series

Agency Approvals

AGENCY AGENCY FILE NUMBER

E183209

R50120008

hold

)PMEDVSSFOUNBYJNVNDVSSFOUEFWJDFXJMMQBTTXJUIPVUUSJQQJOHJO¡$TUJMMBJS

trip

5SJQDVSSFOUNJOJNVNDVSSFOUBUXIJDIUIFEFWJDFXJMMUSJQJO¡$TUJMMBJS

int

.BYJNVNWPMUBHFUIFEFWJDFDBOXJUITUBOEXJUIPVUEBNBHFBUSBUFEDVSSFOU*NBY

= The device regular operation voltage

NBY

.BYJNVNGBVMUDVSSFOUEFWJDFDBOXJUITUBOEXJUIPVUEBNBHFBUSBUFEWPMUBHF7

NBY

)

1PXFSEJTTJQBUFEGSPNEFWJDFXIFOJOUIFUSJQQFETUBUFBU¡$TUJMMBJS

min

= Minimum resistance of device in initial (un-soldered) state.

typ

= Typical resistance of device in initial (un-soldered) state.

NBY

.BYJNVNSFTJTUBODFPGEFWJDFBU¡$NFBTVSFEPOFIPVSBGUFSUSJQQJOH

Caution: Operation beyond the speciﬁed rating may result in damage and possible arcing

and ﬂame.

&GGFDUJWF+BOVBSZBMM315$QSPEVDUTXJMMCFNBOVGBDUVSFE)BMPHFO'SFF)'&YJTUJOH/PO)BMPHFO'SFF315$QSPEVDUTNBZDPOUJOVFUPCFTPMEVOUJMTVQQMJFTBSFEFQMFUFE