Key Points Of Environmental Adaptability Testing For Neutral Block Terminals

As a key connecting component in electrical systems, the environmental adaptability testing of neutral block terminals needs to focus on core factors such as high temperature, humidity, corrosion, vibration, and mechanical impact to ensure stable operation in complex environments. The following are the testing points and analysis:

1. High temperature environment adaptability testing

Testing method: Place the neutral block terminal in a high temperature test chamber, simulate extreme high temperature scenarios (such as above 85 ℃), and continue testing for 7 days to observe whether the insulation material softens, deforms, or releases toxic gases.

Judgment criteria: The terminal housing should be made of flame-retardant materials (such as PA66 nylon or V0 grade flame-retardant plastic), pass open flame testing (self extinguishing within 30 seconds after leaving the fire source), and have no risk of leakage or short circuit at high temperatures.

2. Moisture and Damp Heat Cycle Detection

Testing method: Conduct a temperature and humidity combination cycle test (such as 40 ℃, 95% RH humid and hot environment) to simulate humid areas or outdoor usage scenarios, and detect whether the insulation performance of the terminals has decreased.

Judgment criteria: The insulation resistance must meet the standard (such as ≥ 100M Ω), and there should be no rusting of metal parts or detachment of insulation layer after wet heat cycling.

3. Salt spray and chemical corrosion testing

Test method: conduct salt spray test on metal parts (such as 5% NaCl solution spray for 48 hours), or expose them to mixed gas corrosive environment (such as SO ₂, H ₂ S, etc.) to evaluate the corrosion resistance.

Judgment criteria: Metal components (such as screws and wire terminals) should be tinned or made of stainless steel material, and there should be no red rust, cracks, or poor contact after testing.

4. Vibration and mechanical impact detection

Testing method: Simulate vibrations during transportation or use (such as X, Y, Z three-axis directions, frequency 10-55Hz, amplitude 1.5mm), or apply mechanical impacts (such as drops, impacts) to test the firmness of the terminal structure.

Judgment criteria: The terminals should not be loose, detached, or broken, and the wire clamping mechanism should maintain reliable crimping without the risk of wire slipping out or breaking.

5. Long term aging resistance testing

Testing method: Conduct aging resistance test (such as aging at 105 ℃ for 7 days), or simulate performance degradation after long-term use.

Judgment criteria: The terminal material is not brittle or cracked, and the electrical performance (such as contact resistance and insulation resistance) meets the initial standards.