Recessed Potting Can Leave Circuit Edges Vulnerable to Electrical Breakdown

What the evidence preview establishes

The modules most likely failed through either moisture-and-ionic-contamination ingress or electrical overstress. Potting recessed below the enclosure lip left the circuit-board edges exposed, creating a significant environmental and electrical-clearance vulnerability.

Why this case matters

Fill potted modules flush or slightly convex, eliminate voids, and maintain adequate clearance between active circuitry and board edges. When damage repeats at the same components, investigate environmental access and circuit stress in parallel.