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Rated current of E-Cu bus (DIN43671)
key word：Rittal cabinet, rittal cooling, rittal busbar, rittal fan, rittal electric cabinet
Rated current of E-Cu bus (DIN43671)
As the rated current of copper bus specified in DIN43671
In addition, the following table lists the Flat-PLS bus system (with bare Exposed copper bus, AC up to 60Hz) rated current rating
External value.
These values come from the Flat-PLS bus system, which is installed in
In cabinets with different protection levels, with or without forced ventilation.
Each busbar system and protection level contains 2 values, as shown in Table
The rated current at 30K and 70K overtemperature is shown. And
The rated current specified in DIN43671 is different
The measured temperature outside the cabinet is taken as the ambient temperature.
The advantage of this method is that the cabinet box will also be connected to the bus system
The system will have a great impact, which will be considered into the rated value of the bus system
Parameter. Plan the bus system according to DIN43671 without considering
Considering the factors of cabinet, the cabinet may be caused by large current
There is a thermal problem inside.
Although IEC61439-1/DINEN61439-1 allows high
Over temperature limit of 70K, but ambient temperature 35 ° C and 70K
The absolute temperature of the bus is 105 ° C when the temperature limit is exceeded.
105 ° C is a high value, but it is still far below the melting of copper
Temperature, therefore, is acceptable.
give an example:
If the rated current of 30K overtemperature is applied, it means that the busbar
The temperature is 30K higher than the ambient temperature of the cabinet. In absolute
Temperature, that is, the ambient temperature of the cabinet at 35 ° C
The absolute temperature of the bus is 65 ° C at most.
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