Arc Plates

Arc plates are critical components of circuit breaker arc chutes, typically arranged in parallel stacks. During circuit interruption when an electrical arc forms between separating contacts, the arc is driven into the arc chute where it contacts these plates. The plates split the arc into multiple series segments, increasing arc voltage and cooling the plasma through thermal conduction and radiation. This rapid deionization extinguishes the arc, preventing sustained current flow and protecting electrical systems from damage.

Arc plates operate on principles of arc splitting and cooling. When an arc enters the chute, it's forced between the plates, dividing into smaller series arcs. Each segment requires additional voltage to maintain, exceeding the system voltage and causing extinction. Simultaneously, the plates absorb heat through thermal conduction and radiation, cooling the arc plasma below the ionization temperature of the surrounding medium (typically air or gas).