NTC thermistors for
temperature measurement
Probe assemblies
Series/Type:
B57020M2
Date:
January 2018
© EPCOS AG 2018. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS' prior express consent is prohibited.
EPCOS AG is a TDK Group Company.
Temperature measurement
B57020M2
Probe assemblies
M2020
Applications
Cabinet and evaporator in refrigerators and
deep freezers
Dimensional drawing
Features
Thermistor in molded plastic case with cable
outlet
Highly resistant to water/moisture
PVC-insulated connecting cable (white)
Conductor cross section: 2 × 0.34 mm2
Construction based on
DIN EN 60 730 -1/VDE protection class 2
UL approval (E252167)
Options
Alternative head dimensions, resistance
ratings, rated temperatures, resistance
tolerances and cable lengths available on
request
PVC-free connecting cable on request
Color markings on cable available on request
Single insulated versions with twin wires
available on request
Dimensions in mm
Delivery mode
Bulk
General technical data
Climatic category
Max. power
Resistance tolerance
Rated temperature
Dissipation factor
Thermal time constant
Insulation resistance
(IEC 60068-1)
(at 25 °C)
(in air)
(in water)
(V = 500 V DC)
P25
∆RR/RR
TR
δth
τa
Rins
40/080/56
350
±2
0
approx. 10
approx. 35
> 1000
mW
%
°C
mW/K
s
MΩ
Electrical specification and ordering codes
R25
Ω
5000
5000
5000
R0
Ω
16330
16330
16330
No. of R/T
characteristic
2003
2003
2003
Please read Cautions and warnings and
Important notes at the end of this document.
B25/100
K
3980 ±1.5%
3980 ±1.5%
3980 ±1.5%
Page 2 of 11
l
mm
Ordering code
900 ±30
2000 ±30
2800 ±30
B57020M2502A017
B57020M2502A020
B57020M2502A001
Temperature measurement
B57020M2
Probe assemblies
M2020
Reliability data
Test
Standard
Storage in
dry heat
IEC
60068-2-2
Test conditions
Storage at upper
category temperature
T: 80 °C
t: 1000 h
Storage in damp
IEC
Temperature of air: 40 °C
heat, steady state
60068-2-78 Relative humidity of air: 93%
Duration: 56 days
Storage in coldness
Storage at lower
category temperature
T: 40 °C
t: 1000 h
Rapid temperature IEC
Lower test temperature: 40 °C
cycling (in air)
60068-2-14 Upper test temperature: 80 °C
Time to change from lower to
upper temperature:
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