Terminal Block Inspection Standards: Key To Controlling Product Quality
As the core component of electrical connections, the quality of terminal blocks directly affects the stability and safety of equipment operation. Through systematic testing standards, product quality can be effectively controlled. The key testing points are analyzed from three dimensions: mechanical, electrical, and environmental.
Mechanical performance testing is the fundamental guarantee. The torque test needs to verify that the screw does not slip or break under the specified torque, ensuring the reliability of the pressure line; The pull-out test simulates the actual tensile force to test the bonding strength between the wire and the terminal. The standard requires the wire to maintain a tensile force of 1kgf for 1 minute without falling off. In addition, mechanical life testing requires repeated tightening and loosening operations on spring terminals to ensure that electrical performance still meets standards after 1000 cycles.
Electrical performance testing is the core indicator. Contact resistance testing requires controlling the resistance value within 50m Ω to reduce energy loss; The power frequency withstand voltage test needs to maintain a voltage of 2000V for 1 minute without breakdown to verify the insulation performance; The voltage drop test dynamically monitors the voltage drop value when the current passes through, ensuring that it does not exceed 30mV, reflecting contact stability. The temperature rise test requires that the temperature rise of the terminal at rated current should not exceed 30 ℃ above the ambient temperature to avoid safety hazards caused by overheating.
Environmental adaptability testing is a reliability verification. The flame retardant test requires the terminal material to self extinguish within 30 seconds after the open flame is removed, and there should be no molten droplets igniting the cotton below; In the salt spray test, metal parts are required to be exposed to 5% NaCl solution spray for 96 hours without corrosion by simulating the marine climate. In addition, the alternating humidity test needs to be cycled 10 times in an environment of 85 ℃/85% RH to verify the stability of the terminal under extreme temperature and humidity conditions.
By strictly implementing the above testing standards, the quality of wiring terminals can be systematically controlled, providing a solid guarantee for the safe operation of electrical equipment.
