How do other technologies pass the new UL testing requirements?
A. Other technologies rely on thermal and overcurrent fusing to comply with the revised UL standard requirements. The use of disconnects inside surge protection systems is not a new idea. Existing surge protectors complying with the current (1998) revision of UL 1449 use fuses and thermal disconnects to meet the UL requirements for testing at 5 Amps for seven hours. When exposed to the test conditions, these devices actually disconnect from the circuit within a few seconds. The revised standard (by introducing new intermediate current testing levels at 100, 500 and 1000 Amps) makes the design of the fusing or thermal disconnection mechanism more challenging. The engineering approach many manufacturers take is to make the disconnection mechanism react to these currents very fast in order to prevent the full amount of the current (100, 500, and 1000 Amps) from passing through the device. However, a more sensitive disconnect makes the surge protectors more vulnerable to failures from surg
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