Environmental resistance of connectors

The environments in which connectors are used are varied. Therefore, the requirements for environmental performance will also have corresponding standards.

Environmental performance includes: temperature resistance, moisture resistance, salt spray resistance, vibration resistance and impact resistance and other performance requirements.

①Temperature resistance At present, the maximum working temperature of the connector is 200°C (except for a few high-temperature special connectors), and the minimum temperature is -65°C. Since the current will generate heat at the contact point when the connector is working, resulting in a temperature rise, it is generally believed that the operating temperature should be equal to the sum of the ambient temperature and the temperature rise of the contact point. In some specifications, the maximum allowable temperature rise of the connector at the rated operating current is clearly specified.

②The intrusion of moisture will affect the insulation performance of the connection h and corrode the metal parts. The constant humidity and heat test conditions are relative humidity 90%~95% (according to product specifications, Z height is 98%), temperature +40±20℃, and the test time is at least 96 hours according to product regulations. The alternating damp heat test is more stringent.

③ When the salt spray-resistant connector works in an environment containing moisture and salt, the surface treatment layer of its metal structural parts and contact parts may cause galvanic corrosion, thereby affecting the physical and electrical properties of the connector. To evaluate the ability of electrical connectors to withstand this environment, the salt spray test is specified. It is to hang the connector in the temperature-controlled test box, and spray the sodium chloride solution with the specified concentration with compressed air to form a salt mist atmosphere. The exposure time is specified by the product specification and is at least 48 hours.

④Vibration and shock Vibration and shock resistance are important properties of electrical connectors, especially in special application environments such as aerospace, railway and road transportation. important indicator of sexuality. The relevant test methods are clearly specified. The shock test shall specify the peak acceleration, duration and shock pulse shape, as well as the time of interruption of electrical continuity.

⑤Other environmental performance According to the requirements of use, other environmental performances of electrical connectors include sealing (air leakage, liquid pressure), immersion (adaptive resistance to specific liquids), low air pressure, etc.