The power of the terminals is also an important factor

At this stage, organizations such as UL, IEC, CSA and DIN do not have uniform specifications when specifying the output power and characteristic specifications of terminal block commodities. Customers must understand the difference between UL and IEC specifications. In Europe, the production and manufacture of terminal blocks commodity specifications for the selection of IEC standards, while in the United States manufactured goods are selected UL norms. The difference between these two norms for terminals is very large. Do not understand the product type determination method of technical engineers will take a very big risk, because the use of components may not reach the necessary output power level, or the use of component specifications far beyond the design program must be. In Europe, the current rating of a component is defined in terms of the temperature of the metal material conductor at the time of the detection of the current rise. When the temperature at the foot of the metal material is 45°C higher than the operating temperature, the Precision Measurement staff uses the current flow at that time as the voltage rating (or higher current) of the component. another item in the IEC specification is the allowable current, which is 80% of the higher current flow. Unlike this, UL specification will make the temperature of the metal material electrical conductor than the operating temperature above 30 ℃ when the current of 90% as a component of the current tolerance value. It is not difficult to see that the temperature of a part of the metal material electrical conductor is a very critical element in all applications. For mechanical equipment this is critical. Because mechanical equipment generally must be in the temperature of 80 ℃ working environment. If the temperature of the terminal block is 30℃ or 45℃ higher than this temperature, then the temperature of the terminal block may exceed 100℃. Depending on the type of tolerance and insulation selected for the selected components, it is important that the products operate at a current less than the rated current to ensure that they can operate reliably in the desired temperature range. Sometimes, the raw materials suitable for compact packaging components will not be able to take into account the heat pipe heat dissipation regulations very well, so that the current flow in the application of such terminal components must be much smaller than the rated current. In this way, the necessity of selecting a terminal block is best realized.

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