This post What is the White Powder on the Circuit Breaker Terminals? appeared first on ELECTRICAL TECHNOLOGY. Why Does White Chalky Powder or Paste Form on Circuit Breaker Terminals? You may have noticed a white powder on circuit breaker terminals, especially in basements or areas with high humidity. Typically, this occurs due to one of two reasons: it may be residue from a factory-applied sealant or lubricant, or it could be a … Visit the What is the White Powder on the Circuit Breaker Ter...