4

Thermal (T- and TA-Line)

TA45-2R

www.schurter.com /PG17_20

Circuit Breakers

Diagrams

Without thermal overload protection

P2

P1

6

5

1 pole thermal overload protection

P2

P1

6

3

1 pole thermal overload protection, Shunt terminal

P2

P1

6

5

3

2 pole thermal overload protection

4

3

P2

P1

2 pole thermal overload protection, Shunt terminal

P2

P1

6

4

3

5

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

-10

0.89

-5

0.91

0

0.92

+23

1.00

+30

1.03

+40

1.08

+55

1.16

Example: Rated current = 5 A; Environmental temperature = 40 °C; --> Correction factor =

1.08; Resulting current = 5.5 A --> Fount to next higher rated current: 6 A