熔断电阻器（Fusing resistor）一般会用在LED灯泡或LED驱动器之中以作保护。

 

根据UL1993 CLAUSE 6.4.5(CRD)，使用这类Fusing resistor时，有机会要做一个Limited Short Circuit test和Overload Test。

 

下面是相关的标准条文：

UL1993：6.4.5 A fusing resistor used for thermal protection shall comply with UL1412 or the requirements for CAN/CSA-C22.2 No. 60065-03 (R2008) or the requirements of NMX-J-578-ANCE. Testing shall include the Limited Short Circuit test while installed in the application, unless the test was previously conducted in accordance with UL1412 or CSA C22.2 No.256, using a 20 A test circuit with a 200 A short circuit capacity. If a clearance to combustible materials was used during the Overload test, as permitted in UL1412, the clearance shall be maintained or, the Overload test shall be conducted while the resistor is installed in the application.