Photovoltaic fuse is an important component used to protect photovoltaic cells, strings and systems, with functions such as overload protection, short circuit protection and arc fault protection. To ensure the safety performance and reliability of photovoltaic fuses, a series of certification tests are required. Among them, UL248-19UL certification is the test certification standard for photovoltaic fuses under the American UL standard.
Photovoltaic fuse UL certification_UL248-19 certification standards
UL248-19 suitable for rated voltage to DC1500V, rated current 1A-30A, rated breaking capacity to 20kA circuit, as photovoltaic power generation devices and other semiconductor equipment short circuit and overload protection of photovoltaic fuse, mainly used in solar photovoltaic system combiner box.
Application for photovoltaic fuse UL certification to provide information
1. Product model;
2. Specification parameters;
3. Appearance dimension drawing;
4. Dimension drawing of parts;
5. List of spare parts;
6. Fuse size and current comparison table;
7. Fuse appearance diagram (more complex fuse)
Photovoltaic fuse UL certification test project
1. Temperature rise test VERIFICATION OF TEMPERATURE RISE AND IN;
2. Overload test VERIFICATION OF OVERLOAD OPERATION;
3. Breaking test VERIFICATION OF OPERATION AT RATED VOLTAGE;
4. High and low temperature cycle test VERIFICATION OF THERMALLY INDUCED DRIFT;
6. Overload test VERIFICATION OF OVERLOAD OPERATION after high and low temperature cycle:(AFTER UNACCEPTABLE LEVELS THERMAL DRIFT);
7. Breaking test VERIFICATION OF OPERATION AT RATED VOLTAGE after high and low temperature cycling:(AFTER UNACCEPTABLE LEVELS THERMAL DRIFT);
8. High temperature environment functional inspection VERIFICATION OF FUNCTIONALITY AT TEMPERATURE EXTREMES;
9. Temperature rise test in high temperature environment VERIFICATION OF CURRENT CARRYING CAPACITY (IN):(AFTER FUNCTIONAL TEMPERATURE EXTREMES);
10. Overload test in high temperature environment VERIFICATION OF OVERLOAD OPERATION:(AFTER FUNCTIONAL TEMPERATURE EXTREMES ) ;
11. Current cycling test CURRENT CYCLING.
Photovoltaic fuse UL certification process
1. Project determination: confirm the UL standard, certification cost and time, sample quantity, etc. on which the test is based;
2, data preparation: according to the requirements of UL, the enterprise is ready to certify the required information or documents;
3. Sample Delivery Test: The enterprise will send the sample accredited Testing Laboratory conduct product testing;
4, the issuance of the report: the product test results meet the requirements of UL standards, the formal issuance of the test report;
factory audit: UL will conduct the first factory inspection of the production plant to ensure compliance with standard requirements;
6, mark use: after the audit meets the requirements, the applicant is officially authorized to use the UL mark.
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