Processing Machinery
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PA66 circuit breaker housing
Problem Phenomenon
The circuit breaker housing is carbonized and tracked after the short-circuit arc test
Cause Analysis
Ordinary PA66 has insufficient arc resistance and comparative tracking index, and the surface is carbonized under arc action to form conductive channels; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience
Solution
Select arc-resistant flame-retardant reinforced grades, select CTI value according to voltage level; arc extinguishing chamber structure coordinated with material selection; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
Switching electrical devices are systematically selected according to CTI and flame retardant rating; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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