Arc Runners/Splitter Plates: Plate Thickness 3-10 mm

Component Specifications

Definition

Arc runners and splitter plates are critical safety components within arc quenching chambers of electrical switchgear and circuit breakers. These metallic plates are strategically arranged to split high-current electrical arcs into multiple smaller arcs, increasing surface area for cooling and deionization. They work by creating a series of arc roots that move along the plates, stretching and cooling the plasma until the arc voltage exceeds the system voltage, causing extinction. The plates are typically made of arc-resistant materials with high thermal conductivity and are designed with specific geometries to optimize arc movement and cooling efficiency.

Working Principle

When an electrical fault creates an arc, the arc is drawn onto the plates by electromagnetic forces and thermal gradients. The splitter plates divide the main arc into multiple series arcs, increasing total arc voltage. As the arcs move along the plates, they are cooled through radiation, convection, and conduction. The increased arc voltage and cooling reduce current density and plasma temperature until the arc can no longer sustain itself and extinguishes.

Materials

Copper alloys (Cu-Cr, Cu-W), silver alloys (Ag-W, Ag-C), stainless steel (304, 316), or specialized arc-resistant composites. Typical specifications include: thermal conductivity >200 W/m·K, melting point >1000°C, electrical conductivity >80% IACS, and arc erosion resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Plate Spacing	8-25 mm
Surface Finish	Ra 1.6-3.2 μm
Plate Thickness	3-10 mm
Operating Voltage	Up to 38 kV
Fault Current Rating	Up to 63 kA
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

ISO 62271-1, IEC 62271-100, ANSI/IEEE C37.04, DIN EN 62271-100

Parent Products

This component is used in the following industrial products

Arc Quenching Chamber

A specialized enclosure within a diverter switch designed to extinguish electrical arcs during tap-changing operations.

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Engineering Analysis

Risks & Mitigation

Arc flash if plates are damaged or contaminated
Reduced quenching efficiency due to plate erosion
Thermal damage to adjacent components
Incomplete arc extinction leading to equipment failure

FMEA Triads

Trigger: Material degradation from repeated arcing
Failure: Reduced arc splitting efficiency
Mitigation: Regular inspection and replacement based on erosion depth measurements

Trigger: Contamination from dust or moisture
Failure: Uneven arc distribution and tracking
Mitigation: Proper sealing and regular cleaning of chamber interior

Trigger: Mechanical deformation from thermal stress
Failure: Altered plate spacing affecting arc movement
Mitigation: Use of thermally stable materials and proper mounting with expansion allowances

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Plate spacing tolerance ±0.5 mm, flatness tolerance 0.1 mm per 100 mm

Test Method

High-current arc testing per IEC 62271-100, thermal imaging, dimensional verification, material composition analysis

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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CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Arc Runners/Splitter Plates

Manufacturer profiles associated with Arc Runners/Splitter Plates.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between arc runners and splitter plates?

Arc runners guide the arc into the quenching chamber, while splitter plates divide and cool the arc. They often work together as an integrated system.

How often should arc runners/splitter plates be inspected?

Visual inspection after every fault operation and comprehensive inspection every 3-5 years or as recommended by the manufacturer, checking for erosion, deformation, and contamination.

Can damaged arc plates be repaired?

Minor surface erosion can sometimes be cleaned and smoothed, but significant damage typically requires replacement to maintain safety and performance standards.

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 Runners/Splitter Plates