Carbon composition resistors
SR25/37/52
FEATURES
• Non inductive
• High pulse loading capability.
APPLICATIONS
• Application for overload and high
voltage surge hazard circuits .
DESCRIPTION
A carbon film is deposited on a high
TYPE
D
Max.
grade ceramic body. After that caps
Dimensions ( mm )
L1
L2
d
max.
max.
(± 0.05)
SR25
The resistors are coated with a brown
6.5
7.5
0.6
3.7
9.5
12
0.7
SR52
wire are welded to these end caps.
2.7
SR37
are applied to the rods and copper
6.0
16.5
18.5
0.8
and blue non flammable lacquer witch
provides electrical, mechanical and
climatic protection.
QUICK REFERENCE DATA
DESCRITION
VALUE
SR25
SR37
10Ω to 9.1 ㏀
resistance range
±10%, ±15% ( E12, E24 series )
± 600 ppm / ℃
resistance tolerance
temperature coefficient :
rated dissipation
at Tamb = 70 ℃
max. working voltage
max. overload voltage
dielectric withstanding
voltage(during 1 min.)
basic specifications
safety requirements
SR52
0.25 W
0.5 W
1W
250 V
500 V
350 V
700 V
500 V
1000 V
ac, 500 V
ac, 700 V
ac, 700 V
-
IEC 60 115-1B
UL:1676
CSA : 22.2
VDE : 0860
55 / 155 / 56
C – UL(CSA22.2)
VDE : 0860
climatic category (IEC60)
stability, ∆R/R max. after
load : 1000 hours
soldering heat
overload : √ Pn x R x 2.5
during 1 min.
high voltage surge: ± 10%
10Ω - 3.3 ㏀ : 2K
(1nF capacitor2.5s charge
2.5s discharge 10 cycles)
3.6 ㏀ - 9.1 ㏀ : 3K
± 5% +0.1Ω
± 3% +0.1Ω
± 10% +0.1Ω
± 10% +0.1Ω
10Ω - 4.7 ㏀ : 7K
10Ω - 9.1 ㏀ : 10K
5.1 ㏀ - 3.3 ㏀ : 10K
