D) Failure to pick up & seal 1) Low voltage Remedy: Correct voltage conditions-In case of persistent low voltage change to lower voltage coil or change transformer tap 2) Coil open or shorted Remedy: Replace the coil 3) Mechanical obstruction Remedy: Clean and check free movement of contact assembly 4) Coil excitation without arc chute or arc chute not properly fixed Remedy: Ensure proper fitting of arc chute .....