Technical specifications
6.4 Derating and temperature compensation
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03
645
Examples
Example 1
Starting point:
A plug-in version of a 3VA2 molded case circuit breaker 160 A with an ETU350 LSI trip unit
is to be operated at 70 °C:
I
r(max 70° C)
= 160 A
No derating is required.
Example 2
Starting point:
A plug-in version of a 3VA2 molded case circuit breaker 250 A with an ETU850 LSI trip unit
is to be operated at 60 °C with the COM060 communication module:
I
r(max 60 °C)
= 189 A
6.4.7
Use of terminals with auxiliary conductor connection
When connecting terminals with control wire tap are used, the total current from the main
circuit and control wire must not exceed the maximum rated operational current of the 3VA1
and 3VA2 molded case circuit breakers.
