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.
Ordering information
Type No.
157
threadneck panel mounting (plastic knurled nut bulk
shipped with 5 pcs plus)
Terminal design
P10
blade terminals A6.3-0.8 (QC .250)
K10
screw terminals M4x6
Housing
KF
for tropical and high humidity conditions
Current ratings
0.05...25 A
157 - P10 - .. - 10 A
ordering example
157-...
Technical data
For further details please see chapter: Technical Information
Voltage rating
AC 250 V; DC 28 V
(UL: AC 250 V; DC 50 V)
Current ratings
0.05...25 A
Typical life
0.05...16 A 5,000 operations at 2 x I
N
, inductive
17...25 A
5,000 operations at 2 x I
N
, resistive
Ambient temperature
-20...+60 °C (-4...+140 °F)
Insulation co-ordination
rated impulse
pollution
(IEC 60664 and 60664 A) withstand voltage
degree
2.5 kV
2
reinforced insulation in operating area
Dielectric strength
(IEC 60664 and 60664A) test voltage
operating area
AC 3,000 V
Insulation resistance
> 100 MΩ (DC 500 V)
Interrupting capacity I
cn
0.05...2.5 A 8 x I
N
3...5 A
20 x I
N
6...12 A
200 A
13...25 A
300 A
Interrupting capacity
I
N
U
N
(UL 1077)
0.05...20 A
AC 250 V 2,000 A
0.05...25 A
DC 50 V
2,500 A
Degree of protection
operating area IP40
(IEC 60529/DIN 40050)
terminal area IP00
Vibration
8 g (57-500 Hz) ± 0.61 mm (10-57 Hz)
to IEC 60068-2-6, test Fc,
10 frequency cycles/axis
Shock
25 g (11 ms)
to IEC 60068-2-27, test Ea
Corrosion
96 hours at 5 % salt mist,
to IEC 60068-2-11, test Ka
Humidity
240 hours at 95 % RH
to IEC 60068-2-78, test Cab
Mass
approx. 24 g
2
Standard current ratings and typical internal resistance values
Current
rating (A)
0.05
0.08
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
1
1.2
1.5
1.8
2
2.5
Internal
resistance (Ω)
280
100
110
29
14
7
4.9
3.4
2.5
1.8
1.2
0.8
0.6
0.2
0.3
0.2
Current
rating (A)
3
3.5
4
4.5
5
6
7
8
10
12
13
15
16
20
22
25
Internal
resistance (Ω)
0.1
0.06
0.06
0.05
0.05
0.02
0.02
0.02
< 0.02
< 0.02
< 0.02
< 0.02
< 0.02
< 0.02
< 0.02
< 0.02
Approvals
Authority
VDE
UL
CSA
CQC
Standard
IEC / EN
60934
UL 1077
C22.2 No 235
GB 17701
Rated voltage
AC 250 V
DC 28 V
AC 250 V
DC 50 V
AC 250 V
DC 50 V
AC 250 V
DC 28 V
Current ratings
0.05 A…25 A
0.05 A…20 A
0.05 A…20 A
0.05 A…25 A
0.1 A…20 A
0.1 A…25 A
0.05 A…25 A
0.05 A…25 A
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Thermal Overcurrent Circuit Breaker 157
Dimensions
157-P10
tightening torque max. 1 Nm
3/8-27UNS-2 A
20 OFF
.787
14 ON
.551
4
.157
ø4
.157
Typical time/current characteristics at +23 °C/+73.4 °F
10000
0.05 - 2.7 A
2.8 - 23 A
25 A
1000
8
.315
Trip time in seconds
1.2
.047
100
45
1.77
10
9.4
.370
2
19.8
.780
blade terminals
DIN 46244-A6.3-0.8
(QC .250)
1
mounting hole
0.1
14.5
.571
1
2
4
6 8 10
... times rated current
20
40
31
1.22
8.9
-0.1
.350
-.004
ø9.6
-0.1
.378
-.004
The time/current characteristic curve depends on the ambient temperature
prevailing. In order to eliminate nuisance tripping, please multiply the
circuit breaker current ratings by the derating factor shown below. See also
section Technical information.
Ambient temperature °F
°C
Derating factor
-4
-20
0.76
+14
-10
0.84
+32
0
0.92
+73.4
+23
1
+104
+40
1.08
+122
+50
1.16
+140
+60
1.24
157-K10
Installation drawings
9.4
.370
flat head screw M4x6 ISO 1580
tightening torque max. 1.2 Nm
max. 5.4
max .213
operating area
Internal connection diagram
35
1.38
1
.039
mounting area
This is a metric design and millimeter dimensions take precedence ( mm )
inch
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Thermal Overcurrent Circuit Breaker 157
Accessories
Mounting sockets
10F-P10
(up to 16 A max. load)
Front panel water splash cover, transparent Y 300 538 01
and knurled nut Y 300 628 01
X 200 799 01 (bonded to nut)
(IP64)
68
2.68
12
21
11
22
8
.315
blade terminals DIN 46244-A6.3-0.8 (QC .250)
3/8-27 UNS-2B
10F-K10
(up to 20 A max. load)
wire cross sectional areas
2 x max. 2.5 mm
2
(AWG 14) stranded
2 x max. 4 mm
2
(AWG 12) solid
1
12
.472
.039
12
.472
Front panel water splash cover, transparent
with special knurled nut
X 200 798 02 (bonded to nut)
(IP64)
1
.039
5.6
.220
30
1.18
2
9.5
.374
75
15
.591
45
1.77
75
2.95
13
.512
6
.236
7
.276
50
1.97
12
11
21
22
3/8-27 UNS-2B
7.5
.296
Splash cover (black) with hex nut
(IP64)
X 210 739 01
10F-A10
(up to 16 A max. load)
blade terminals DIN 46244-A6.3-0.8 (QC .250)
8
.315
3/8-27 UNS-2B
59
2.32
12
22
21
11
wire cross sectional areas
2 x max. 2.5 mm
2
(AWG 14) stranded
2 x max. 4 mm
2
(AWG 12) solid
7
.276
Knurled nut 3/8"
plastic (standard)
Y 307 117 02
ø15
.591
3
.118
Accessories for sockets
(up to 20 A max. load)
2-way bus bar
Y 301 166 02
4-way bar
Y 301 166 01
4.2
.165
2.9
.114
8.5
.335
7.9
.311
12.5
.492
15
.591
22.9
.902
thickness = 0.8 mm
.031 in.
15
15
15
.591 .591 .591
52.9
2.08
3/8-27UNS-2B
Connector bus links -K10
X 210 589 01/
2.5 mm
2
(AWG 14), black (up to 20 A max. load)
X 210 589 02/
1.5 mm
2
(AWG 16), brown (up to 13 A max. load)
ø2.5
.099
50 pin lugs to DIN 46230
tinned copper
Connector bus links -P10
X 210 588 01/
1.5 mm
2
(AWG 16), brown (up to 13 A max. load)
X 210 588 02/
2.5 mm
2
(AWG 14), black (up to 20 A max. load)
X 210 588 03/
2.5 mm
2
(AWG 14), red (up to 20 A max. load)
X 210 588 04/
2.5 mm
2
(AWG 14), blue (up to 20 A max. load)
100 quick-connect tabs 6.3 (.250)
DIN 46247 tinned brass,
insulated
~70
~2.76
~70
~2.76
This is a metric design and millimeter dimensions take precedence ( mm )
inch
All dimensions without tolerances are for reference only. In the interest of improved design,
performance and cost effectiveness the right to make changes in these specifications
without notice is reserved.Product markings may not be exactly as the ordering codes.
Errors and omissions excepted.
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