Arc Chute / Extinguishing Chamber for Circuit Breakers

Product Specifications

Technical details and manufacturing context for Arc Chute / Extinguishing Chamber

Definition

The Arc Chute or Extinguishing Chamber is a critical safety component of a Circuit Breaker (Main Switch). Its primary function is to safely manage the high-temperature electrical arc that is generated when the breaker's contacts open to interrupt a circuit under load. It confines the arc within a controlled environment, rapidly cools and deionizes the plasma, and elongates the arc path to increase its resistance, ultimately causing the arc to extinguish and preventing damage to the breaker contacts and surrounding equipment. The chamber is typically constructed from galvanized steel plates, arc-resistant ceramics such as steatite, and copper alloys, which are selected for their thermal and electrical properties. The design incorporates a series of metal plates, known as arc splitters or deion plates, which divide the arc into multiple smaller arcs, increasing the total arc voltage and facilitating rapid extinction. The rated voltage range is 12–40.5 kV, rated current 630–4000 A, and short-circuit breaking capacity 25–63 kA, per IEC 62271-100. Arc extinguishing time is 10–30 ms, contact stroke 8–20 mm, and arc chamber pressure 0.1–0.5 MPa. Operating temperature range is -40 to 85 °C, insulation level 28–95 kV, and material grade for ceramic is Al2O3 95–99% per GB/T 5593. Weight ranges from 2 to 15 kg depending on rating. These values are reference ranges and must be verified for the specific model and application with the legal manufacturer or supplier. The arc chute is essential for reliable interruption of fault currents and protection of downstream equipment.

Working Principle

When the circuit breaker opens, the moving contact separates from the fixed contact, creating an electrical arc. This arc is driven into the chamber's structure, typically a series of metal plates (arc splitters or deion plates). The plates divide the arc into multiple smaller, series arcs, which increases the total arc voltage beyond the system voltage. Simultaneously, the plates absorb heat from the arc, cooling the plasma and promoting deionization of the air/gas within the chamber. This combined effect of arc splitting, cooling, and elongation causes the arc to extinguish rapidly.

Common Materials

Galvanized Steel Plates, Arc-Resistant Ceramic (e.g., Steatite), Copper Alloys

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Voltage	12–40.5 kV	Determines insulation and arc quenching capabilityIEC 62271-100
Rated Current	630–4000 A	Continuous current carrying capacityIEC 62271-100
Short-Circuit Breaking Capacity	25–63 kA	Maximum fault current that can be interruptedIEC 62271-100
Arc Extinguishing Time	10–30 ms	Time to clear arc after contact separation
Contact Stroke	8–20 mm	Travel distance for contact separation
Arc Chamber Pressure	0.1–0.5 MPa	Pressure rise during arc quenching
Operating Temperature Range	-40–85 °C	Ambient temperature limits for reliable operation
Insulation Level	28–95 kV	Power frequency withstand voltageIEC 62271-1
Material Grade	Al2O3 95–99 %	Alumina content in ceramic arc chuteGB/T 5593
Weight	2–15 kg	Depends on voltage and current rating

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

Components / BOM

Arc Splitters / Deion Plates
Metal plates that split the main arc into smaller series arcs, increasing arc voltage and providing cooling surfaces.

Material: Galvanized Steel or Copper Alloy
Chamber Housing
The outer structure that contains the arc splitters and confines the arc plasma.

Material: Arc-Resistant Thermoset Plastic or Ceramic
Vent / Gas Outlet Part
Allows hot, ionized gases from the extinguished arc to be safely vented from the chamber.

Material: Integrated into Housing

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Circuit Breaker (Main Switch)

View system integration details

Manufacturers of Arc Chute / Extinguishing Chamber

Manufacturer profiles associated with Arc Chute / Extinguishing Chamber.

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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 · Page last updated 16 September 2026

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Frequently Asked Questions

What is the primary function of an arc chute?

The arc chute contains, cools, and extinguishes the electrical arc formed when circuit breaker contacts separate under load, preventing damage to the breaker and surrounding equipment.

What materials are commonly used in arc chutes?

Typical materials include galvanized steel plates, arc-resistant ceramics (e.g., steatite), and copper alloys, chosen for their thermal and electrical properties.

What are the typical rated voltage and current ranges?

According to IEC 62271-100, rated voltage is 12–40.5 kV and rated current is 630–4000 A. These are reference ranges; verify with the manufacturer for specific models.

How does the arc chute extinguish the arc?

The arc is split into smaller arcs by metal plates, increasing arc voltage, while the plates absorb heat and cool the plasma, promoting deionization and rapid extinction.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric to 10 bar (operational), withstands arc pressure surges up to 50 bar transient
other spec:	Rated voltage: 1-36 kV, Rated current: 630-6300 A, Breaking capacity: 16-100 kA, Dielectric strength: 2-50 kV/mm
temperature:	Ambient to 200°C (operational), withstands arc temperatures up to 20,000°C transient

Arc Chute / Extinguishing Chamber

Product Specifications

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Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

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