Derating For The 3Va1 Switch Disconnector - Siemens 3VA1 100 A Manual

6.4.6

Derating for the 3VA1 switch disconnector

The 3VA1 SD switch disconnectors do not have a trip unit. The temperature inside the switch
disconnector is however influenced by the ambient temperature and the current-dependent
power loss generated inside the unit. Nonetheless, 3VA1 switch disconnectors up to 125 A
do not require derating up to 70 °C.
To prevent overloading of switch disconnectors up to 125 A under difficult thermal
conditions, the maximum rated continuous operational current must be limited as a function
of the ambient temperature:
3VA molded case circuit breakers
Manual, 04/2015, A5E03603177010-02
No derating up to the rated operational current I
Technical specifications
6.4 Derating and temperature compensation
of the molded case circuit breaker
n
499