This portfolio offers many benefits to the customers design. Relying on prototype testing alone to establish surge performance can be unreliable, so the use of resistors with specified surge performance safeguards against costly field failures, or last minute changes to comply with EMC tests. Where designs are to be submitted for UL approval, it will generally be desirable to use UL recognised fusible resistors, but in any case, the use of these products can help to reduce the risks of fire.