2

Thermal (T- and TA-Line)

T9-817

www.schurter.com /PG17_18_19

Circuit Breakers

Approval

Rated current

Rated voltage AC

Rated voltage DC

UL 1077

4 - 12 A

240 V

48 V

CSA 22.2 235

4 - 12 A

240 V

48 V

IEC 60934

4 - 12 A

240 V

48 V

GB 17701

4 - 12 A

240 V

48 V

Typical internal resistance

Rated Current [A]

Internal Resistance [m

Ω]

4

26.3

5

24.1

6

19.0

7

18.0

8

14.8

10

13.0

12

12.7

Time-Current-Curves

23

45

16

78

10

[min]

[sec]

10'000

1'000

100

1

0.1

10

30

20

10

5

3

1

60

T9

5 A -16 A (TC-1)

4 A

(TC-2)

Multiple of Rated Current In

Reference Temperature +23°

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

0,85

+10

0,95

+23

1,00

+40

1,08

+60

1,21

Example: Rated current = 10 A; Environmental temperature = 60 °C; --> Correction factor

= 1.21; Resulting current = 12.1 A --> Fount to next higher rated current: 13 A