Inrush current limiters
ICLs
B57237
S237
Applications
Dimensional drawing
Switch-mode power supplies
Soft-start motors, e.g. in vacuum cleaners
Features
Useable in series connections up to 265 Vrms
Coated thermistor disk
Kinked leads of tinned copper wire
Wide resistance range
UL approval (E69802)
Options
Resistance tolerance <20% and alternative
lead configurations available on request
Dimensions in mm
Approx. weight 2 g
Delivery mode
Bulk (standard),
cardboard tape, reeled or in Ammo pack
General technical data
Climatic category
Max. power
(IEC 60068-1)
(at 25 °C)
55/170/21
3.1
Pmax
W
Resistance tolerance
Rated temperature
B value tolerance
Dissipation factor
Thermal cooling time constant
Heat capacity
∆RR/RR ±20
%
°C
%
mW/K
s
TR
25
∆B/B
δth
τc
±3
(in air)
(in air)
approx. 17
approx. 90
approx. 1530
Cth
mJ/K
Electrical specification and ordering codes
1)
1)
R25 Imax
No. of
B25/100
Ctest
Ctest
Param. Param. Ordering code
(0...25 °C) R/T char-
230 V 110 V for R(I)1) for R(I)1)
Ω
A
acteristic
K
µF
µF
k
n
9.0
1201
1202
1202
1203
1203
1302
1308
1302
1304
1304
2700
2800
2800
2900
2900
3000
3060
3000
3300
3300
700
700
700
700
700
700
700
700
700
900
2800 0.622
2800 0.806
2800 0.843
2800 1.03
2800 1.05
2800 1.16
2800 1.29
2800 1.49
2800 1.57
3600 1.78
ꢀ1.27
ꢀ1.30
ꢀ1.30
ꢀ1.32
ꢀ1.32
ꢀ1.33
ꢀ1.34
ꢀ1.33
ꢀ1.37
ꢀ1.37
B57237S0109M000
B57237S0229M000
B57237S0259M000
B57237S0479M000
B57237S0509M000
B57237S0709M000
B57237S0100M000
B57237S0150M000
B57237S0220M000
B57237S0330M000
1
2.2 7.0
2.5 6.5
4.7 5.1
5.0
4.2
3.7
3.0
2.8
2.5
5
7
10
15
22
33
1) For details on the capacitance Ctest as well as on the parameters k and n refer to "Application Notes", chapters 2.6 and 2.7.
Please read Important notes and
Page 2 of 6
Cautions and warnings at the end of this document.
EPCOS [ EPCOS ]
