Applications

Switch-mode power supplies

Soft-start motors, e.g. in vacuum cleaners

Features

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

Delivery mode

Bulk (standard),

cardboard tape, reeled or in Ammo pack

Dimensional drawing

Dimensions in mm

Approx. weight 2 g

General technical data

Climatic category

(IEC 60068-1)

55/170/21

Max. power

(at 25

°C)

3.1

W

Resistance tolerance

∆R

±20

%

Rated temperature

25

°C

B value tolerance

∆B/B

±3

%

Dissipation factor

(in air)

δ

th

approx. 17

mW/K

Thermal cooling time constant

(in air)

τ

c

approx. 90

s

Heat capacity

approx. 1530

mJ/K

Electrical specification and ordering codes

Ω

(0...25

°C)

A

No. of

R/T char-

acteristic

K

230 V

µF

110 V

µF

Param.

k

Param.

n

Ordering code

1

9.0

1201

2700

700

2800

0.622

1.27

B57237S0109M000

2.2 7.0

1202

2800

700

2800

0.806

1.30

B57237S0229M000

2.5 6.5

1202

2800

700

2800

0.843

1.30

B57237S0259M000

4.7 5.1

1203

2900

700

2800

1.03

1.32

B57237S0479M000

5

5.0

1203

2900

700

2800

1.05

1.32

B57237S0509M000

7

4.2

1302

3000

700

2800

1.16

1.33

B57237S0709M000

10

3.7

1308

3060

700

2800

1.29

1.34

B57237S0100M000

15

3.0

1302

3000

700

2800

1.49

1.33

B57237S0150M000

22

2.8

1304

3300

700

2800

1.57

1.37

B57237S0220M000

33

2.5

1304

3300

900

3600

1.78

1.37

B57237S0330M000

Inrush current limiters

B57237

ICLs

S237

Page 2 of 6

Please read Important notes and

Cautions and warnings at the end of this document.