Arc Plates: Thickness 1.5-3.0 mm, Plate Spacing 2-5 mm

Component Specifications

Definition

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.

Working Principle

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).

Materials

Copper alloys (often copper-chromium or copper-tungsten for high thermal conductivity and erosion resistance), sometimes with steel backing plates. Plates may be coated or treated for enhanced arc resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Thickness	1.5-3.0 mm
Plate Spacing	2-5 mm
Operating Voltage	Up to 1000V AC/DC
Arc Energy Handling	10-50 kJ depending on design
Temperature Resistance	Up to 3000°C transient

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

IEC 60947-2, UL 489, ANSI/IEEE C37.13

Parent Products

This component is used in the following industrial products

Circuit Breaker Arc Chute

The Circuit Breaker Arc Chute is a critical safety component in electrical circuit breakers, designed to rapidly extinguish electric arcs that form during circuit interruption.

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Engineering Analysis

Risks & Mitigation

Arc plate erosion reducing interrupting capacity
Insufficient cooling causing arc reignition
Plate misalignment creating arc channeling

FMEA Triads

Trigger: Thermal cycling and arc erosion
Failure: Plate thinning and material loss
Mitigation: Regular inspection, use of erosion-resistant alloys, proper sizing for expected fault currents

Trigger: Contamination or corrosion
Failure: Reduced thermal conductivity and altered surface properties
Mitigation: Clean operating environment, protective coatings, regular maintenance

Trigger: Mechanical vibration
Failure: Plate misalignment altering arc path
Mitigation: Secure mounting, vibration-resistant designs, periodic alignment checks

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.2 mm plate spacing, ±0.1 mm plate flatness

Test Method

High-current interruption testing per IEC 60947-2, thermal imaging for heat distribution, dimensional verification

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Arc Plates

Manufacturer profiles associated with Arc Plates.

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Frequently Asked Questions

Why are arc plates made of copper alloys?

Copper alloys offer excellent thermal conductivity to dissipate arc heat quickly, good electrical conductivity to minimize resistance heating, and reasonable erosion resistance against arc plasma damage.

How do arc plates affect circuit breaker performance?

Properly designed arc plates determine interrupting capacity, clearing time, and contact erosion rates. Insufficient plates can lead to arc reignition or excessive contact damage.

Can arc plates be replaced individually?

Typically no - arc plates are replaced as complete arc chute assemblies since their spacing, alignment, and material consistency are critical for safe operation.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Arc Plates