निम्नलिखित में से कौन सा एक सुरक्षात्मक अवयव है जिसे परिपथ में लगाया जाता है, और अत्यधिक धारा प्रवाहित होने पर यह पिघल जाता है जिससे परिपथ टूट जाता है?

In a standard Miniature Circuit Breaker (MCB), which component is specifically responsible for providing the time-delayed tripping action during an overload condition?

In a High Rupturing Capacity (HRC) fuse, the space surrounding the fuse element is filled with a powder such as silica sand. What is the primary role of this filling material during the interruption of a fault current?