3
CIRCUIT BREAKERS FOR EQUIPMENT TA45, 3 POLE
Effect of ambient
temperature
The unit is calibrated for an ambient tem-
perature of +23°C. To determine the rated
current for a lower or higher ambient
temperature, use a correction factor from
the table below:
*Ambient
Correction factor
temperature [°C]
-10
-5
0,89
0,91
0,92
1,00
1,03
1,08
1,16
0
+23
+30
+40
+55
Example
Rated current at +23°C
Ambient temperature
Correction factor
5,0 A
+40°C
1,08
Chosen rated current at
+40°C ambient temperature
5 A x 1,08 = 5,5 A
*Temperature must be measured at the rear of the
breaker next to the terminals after equipment operating
temperature has been reached.
Tripping characteristic
Tripping characteristic
3 A ≥ I ≤12 A
I <3 A
n
n
[ min ] [ sec ]
10'000
[ min ] [ sec ]
10'000
Type
Rated current
TA45
I <3 A
n
Type
Rated current
TA45
3 A ≥ I ≤12 A
n
60
60
3 pole switch
2 pole protected
+23 °C
3 pole switch
2 pole protected
2`000
1`00
500
2`000
30
30
20
20
10
5
Ambient temp.
+23 °C
1`00
500
Ambient temp.
10
5
200
100
50
200
100
50
1
1
20
10
5
20
10
5
2
1
2
1
0,5
0,5
0,3
0,2
0,3
0,2
0,1
0,1
1,05 1,32
2
3
4
5
8
10
n
1,05 1,32
2
3
4
5
8
10
n
Tripping time
[ x I
Multiple of rated current
[ x I
Schurter, Inc. Phone 707-778-6311 • Fax 707- 778-6401 • E-mail info@schurterinc.com • Website http://www.schurterinc.com 255
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