he industrial plug is connected to the mechanical and electrical components of the electrical circuit. Therefore, the electrical parameters of the connector itself many customers have chosen the connector first thing to consider. Following woo the Division Aviation plug-analysis, led by the importance of customer-depth parameters.

The first point: the rated voltage

Rated voltage, also known as operating voltage, it mainly depends on the insulating materials used in the connected machine, contact the spacing between pairs. Certain components or devices in less than its rated voltage may not be able to complete their proper function. The rated voltage of the connector is in fact the maximum recommended operating voltage for the production of plant should be understood. In principle, the connector can work less than the rated voltage. Division I more inclined to pressure connector (electric strength) indicators, in accordance with the customer environment, the level of security requirements to a reasonable recommendation, optional rated voltage. In other words, the same pressure indicators, depending on the use of environmental and safety requirements, you can use different maximum operating voltage. It is also more in line with the objective to use.

The second point: the rated current

Rated current, also known as the operating current. With rated voltage lower than the rated current, connectors generally able to work properly. In the design process of the connector, rated current of the thermal design of the connector to meet the requirements, because in contact with current flows due to conductor resistance and contact resistance, contact will heat. When the fever of more than a certain limit, will destroy the connector insulation and the formation of contact with the softening of the surface coating, resulting in failure. Therefore, to limit the rated current, in fact restrict the connector internal temperature does not exceed the specified value. The choice of when to pay attention to the question is: For multi-pin connector, rated current must be derated. Large current situations should pay attention to, for example, φ3.5mm contact with the general provisions of the rated current of 50A, but in the five core derating the use of 33%, that is, the rated current of each core is only 38A, Number of cores The more, the larger the derating. The magnitude of the derating can be found in the core number of Division I arranged and technical characteristics table: Figure

The third point: the contact resistance

The contact resistance refers to resistance of two contact conductors in the contact section. It should be noted the two issues in the selection of connector contact resistance refers to the fact "contact resistance", which includes the contact resistance and contact resistance of the conductor. Usually the conductor resistance is small, the contact resistance of the contact resistance is called in a lot of technical specifications. Second, the connection of small-signal circuit, pay attention to the contact resistance index is given to test under what conditions, because the contact surface oxide layer will be Annex, oil or other pollutants, the two contact surfaces will produce the film resistance . In the film thickness increases, the resistance increases rapidly, the film become a poor conductor. However, the film in the high contact pressure, mechanical breakdown or electrical breakdown in high voltage, high current. The connector design on some of the small size of the contact pressure is quite small, only use the occasion mA and mV level, the film resistance is not easy breakdown, which may affect the transmission of electrical signals. Contact resistance - Millivolt level method provides one of the GB5095 "electrical contact resistance test in the basic testing procedures and measuring methods of electromechanical components in the device, in order to prevent the insulating film on the contact breakdown
The test circuit open circuit electromotive force DC or AC peak should not be greater than 20mV DC or AC test current should not exceed 100mA. In fact, this is a low contact resistance test, therefore, have required the choice of connector selected by the low contact resistance index. I am the Secretary for Space Division Air plug in strict accordance with the relevant national standards strictly control testing.

The fourth point: shielding

Modern electrical and electronic equipment components density and related functions between them, increasing the proposed strict limits on electromagnetic interference. Connectors are often metal shell or high-performance engineering plastic injection molding closed up to prevent internal electromagnetic radiation or by the interference of external electromagnetic field, and woo the Division Aviation plug-depth research, all the connectors all use of alloy or high performance plastic seal.