Siemens 3VA1 100 A Manual page 492

Technical specifications
6.4 Derating and temperature compensation
Using the setting factor calculated at 50 °C, it is possible to read the correction factor K off
the following charts:
No derating up to the rated operational current I
Using the two calculated values, it is possible to determine the temperature compensation
TK and finally the setting value for the trip unit I
TK(T
K
T
u
Trip unit setting value:
I
r(TU)
I
r(TU)
492
) Temperature compensation for molded case circuit breaker with service tempera-
U
ture T
U
Correction factor
Service temperature of molded case circuit breaker
= I · EF(50 °C) · TK
n
Trip unit setting value with service temperature T
of the molded case circuit breaker
n
:
r(TU)
u
3VA molded case circuit breakers
Manual, 04/2015, A5E03603177010-02