B) Over heating of main contact path 1) Reason: Foreign matter on the magnet pole faces or jamming of contact carrier preventing contact closing Remedy: –Remove the foreign matter 2) Reason: Improper termination of cables, improper cross section of cable & busbar Remedy: Check the millivolt drop across cable/strands & terminals The mV drop should be at rated currents otherwise clean busbar or recrimp cable . 3) Reason: Presence of harmonics Remedy: Suitable derating to be employed. 4) Reason: Improper ventilation of panel Remedy: Provide suitable cooling for the panels.