Thermal Overcurrent Circuit Breaker 157
Description
Single pole thermal circuit breaker with push-to-reset, tease-free,
trip-free, snap action mechanism (R-type TO CBE to EN 60934),
threadneck panel mounting. The optional -KF housing is particularly
suited to high humidity and other damp conditions.
Approved to CBE standard EN 60934 (IEC 60934).
Typical applications
Motors, transformers, solenoids, extra low voltage wiring systems.
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Ordering information
157-...
Type No.
157
threadneck panel mounting (plastic knurled nut bulk
shipped with 5 pcs plus)
Technical data
Terminal design
P10 blade terminals A6.3-0.8 (QC .250)
K10 screw terminals M4x6
Housing
For further details please see chapter: Technical Information
Voltage rating
AC 250 V; DC 28 V
(UL: AC 250 V; DC 50 V)
KF for tropical and high humidity conditions
Current ratings
Current ratings
Typical life
0.05...25 A
0.05...25 A
0.05...16 A 5,000 operations at 2 x IN, inductive
17...25 A
5,000 operations at 2 x IN, resistive
157 - P10 - .. - 10 A ordering example
Ambient temperature
-20...+60 °C (-4...+140 °F)
Insulation co-ordination
(IEC 60664 and 60664 A) withstand voltage
2.5 kV
rated impulse
pollution
degree
2
Standard current ratings and typical internal resistance values
reinforced insulation in operating area
Current
rating (A)
Internal
Current
Internal
resistance (Ω)
Dielectric strength
(IEC 60664 and 60664A) test voltage
resistance (Ω) rating (A)
operating area
AC 3,000 V
0.05
0.08
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
1
280
100
110
29
3
0.1
Insulation resistance
Interrupting capacity Icn
> 100 MΩ (DC 500 V)
0.05...2.5 A 8 x IN
3.5
4
0.06
3...5 A
6...12 A
13...25 A
20 x IN
200 A
300 A
0.06
4.5
5
0.05
Interrupting capacity
(UL 1077)
IN
UN
0.05...20 A
0.05...25 A
AC 250 V 2,000 A
DC 50 V
14
0.05
2,500 A
Degree of protection
(IEC 60529/DIN 40050)
operating area IP40
terminal area IP00
7
6
0.02
Vibration
8 g (57-500 Hz) 0.61 mm (10-57 Hz)
to IEC 60068-2-6, test Fc,
10 frequency cycles/axis
4.9
3.4
2.5
1.8
1.2
0.8
0.6
0.2
0.3
0.2
7
0.02
8
0.02
Shock
25 g (11 ms)
to IEC 60068-2-27, test Ea
10
12
13
15
16
20
22
25
< 0.02
< 0.02
< 0.02
< 0.02
< 0.02
< 0.02
< 0.02
< 0.02
Corrosion
Humidity
Mass
96 hours at 5 % salt mist,
to IEC 60068-2-11, test Ka
240 hours at 95 % RH
to IEC 60068-2-78, test Cab
1.2
1.5
1.8
2
approx. 24 g
Approvals
Authority
Standard
Rated voltage
Current ratings
2.5
VDE
IEC / EN
60934
AC 250 V
DC 28 V
0.05 A…25 A
0.05 A…20 A
UL
UL 1077
AC 250 V
DC 50 V
0.05 A…20 A
0.05 A…25 A
CSA
CQC
C22.2 No 235 AC 250 V
DC 50 V
0.1 A…20 A
0.1 A…25 A
GB 17701
AC 250 V
DC 28 V
0.05 A…25 A
0.05 A…25 A
1646
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