4

Thermal (T- and TA-Line)

T12-211

www.schurter.com /PG17_20

Circuit Breakers

Typical internal resistance

Rated Current [A]

Internal Resistance [

Ω]

0.05

225.000

0.50

3.300

1.00

0.880

2.00

0.267

3.00

0.128

4.00

0.073

5.00

0.040

6.00

0.031

7.00

0.018

8.00

0.018

9.00

0.010

10.00

0.0087

11.00

0.0087

12.00

0.0087

13.00

0.0087

14.00

0.0070

15.00

0.0070

16.00

0.0055

Effect of ambient temperature

The units are calibrated for an ambient temperature of +23°C. To determine the rated cur-

rent for a lower or higher ambient temperature, use a correction factor (typical value) from

the table below:

Ambient temperature [°C]

Correction factor

-5

0.87

0

0.90

10

0.95

23

1.00

30

1.05

40

1.12

50

1.20

60

1.30

Example: Rated current = 5 A; Environmental temperature = 50 °C; --> Correction factor =

1.2; Resulting current = 6.0 A