Arc runner/horns are conductive components in arc chutes that guide and extinguish electrical arcs in circuit breakers and switches.
Arc runners, also known as horns, are metallic components strategically positioned within arc chutes of electrical switching devices. Their primary function is to capture, guide, and elongate electrical arcs that form during contact separation, directing them into arc-splitting plates or grids where they are cooled, deionized, and extinguished. This prevents arc re-strikes, minimizes contact erosion, and ensures safe interruption of fault currents in medium to high-voltage applications.
诱因 → 失效模式 → 工程缓解
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The terms are often used interchangeably, but 'arc runners' typically refer to elongated conductive paths, while 'arc horns' may describe more pronounced, horn-shaped projections; both serve to attract and guide arcs.
By directing arcs away from main contacts, they reduce contact erosion and thermal damage, extending operational life and maintenance intervals.
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