Series CRF V I T R O H M
Power Wirewound Resistors
,
Flame retardant, safety version
UL Recognized
(UL 1412, fusing and temp. limited resistors, file E 330640)
Specifications
Type CRF
253-8
CRF
254-8
CRF
256-8
Nominal Power rating P
40
2,2 3,0 4,0
P
70
W 2,0 2,5 3,5
Resistance range Ω See Page 2
E-Series E24
Tolerances % ±1 , ±2 , ±5
Temperature coefficient 10
-6 *
K
-1
120
±50
Max. working voltage V
RMS
Insulation voltage (1min.) V
RMS
max 75 V
Insulation resistance Ω not insulated
Derating linear ºC 70…350 (0W)
Climatic category 55/350/56
Temperature range ºC -55 … 350
Thermal resistance KW
-1
85 65 65
Failure Rate
(Total, ϑ
0
, max, 60% cont. lev.)
10
-9
h
-1
appr. 10 depends on value
Endurance (P
70 ,
70°C, 1000h) [∆R/R] % ± 5,0 average
Damp heat, steady state
(40°C, 93% r.h., 56d) [∆R/R] % ± 5,0
Climatic sequence
[∆R/R] % ± 2,0
Terminal strength [∆R/R] % ± 0,2
Terminal Tensile Strength N 50
Resistance to soldering heat
(260°C, 10s)
[∆R/R] % ± 0,5
Solderability s 2,5 Flowtime; solderglobule test, IEC 60068-2-20
Marking Printed in clear
Revision 200910
VITROHM PORTUGUESA, Lda. – Est. Nacional 249-4, Trajouce – 2765-653 S. Domingos de Rana – PORTUGAL
Tel:+ 351 214 457 700 - Fax:351 214 457 755 – Germany Sales Tel:+ 0049 4121 870 103 - e-mail:vitrohm.support@yageo.com – www.vitrohm.com
Series CRF V I T R O H M
Type UL – Voltage rating Resistance range
CRF253-8 230 V 10R … 330R
CRF254-8 230 V 10R … 330R
CRF256-8 230 V 10R … 330R
CRF253-8 120 V 10R … 90R
CRF254-8 120 V 10R … 90R
CRF256-8 120 V 10R … 90R
Note: Resistors are designed to fuse safety when mains-voltage is applied.
In accordance with UL-testing fusing-characteristics are as shown below
Lackhosen
Coating residues
2 2
6
±1
6
±1
C
±1
2 5 x 8
1 0 R 5 %
L
máx
d
S
±0.5
D
2 5 x 8
1 0 R 5 %
2 5 x 8
1 0 R 5 %
L ∅ D * ∅ d
Type max max
CRF253-8 14,5 4,5 0,65
CRF254-8 12,5 6,0 0,80
CRF256-8 17,0 6,0 0,80
*R <10R Dmax. +1
Packaging:
Type Packaging Pieces Pack.-code C s
CRF253-8 Taped/Ammopack 1000 T 85 10
CRF254-8 Taped/Ammopack 1000 T 85 10
CRF256-8 Taped/Ammopack 1000 T 85 10
Ordering example:
CRF254-8 5 T 15R
Type Tolerance Pack-Code R- value
Revision 200910
VITROHM PORTUGUESA, Lda. – Est. Nacional 249-4, Trajouce – 2765-653 S. Domingos de Rana – PORTUGAL
Tel:+ 351 214 457 700 - Fax:351 214 457 755 – Germany Sales Tel:+ 0049 4121 870 103 - e-mail:vitrohm.support@yageo.com – www.vitrohm.com
1
10
100
1000
20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125
Pow .(W)
F u s in g t im e .( s e g )
253-8
254-8
256-8
Dimensions in mm :
