The PIC lab thermal test stabilized in 3 hours, 10 minutes
when the test was considered complete. Table III shows
results from this test. In this case, five out of six of these
tested values highlighted in Table IIII exceed the thermal
design threshold of 50oC, with line terminals B and C
Fig. 8: Photos of Breaker 4919-2 clockwise from upper right;
external breaker case, line-side of breaker cover, main moving
and stationary contacts, arc-chute assemblies.
Fig. 11: Infrared inspection of 150 ampere Breaker 4919-1
located in LV MCC D302D-4H. Note elevated temperature at line
side of MCCB with hot spot temperature of 171.8oF.
demonstrating the highest measured temperatures, a result
verified by field based IR scans. Overall, the lab test once
again delivered results consistent with IR scans from the field.