Arc Chute / Extinguisher for Output Circuit Breakers

Product Specifications

Technical details and manufacturing context for Arc Chute / Extinguisher

Definition

The arc chute, also known as an arc extinguisher, is a critical safety component in output circuit breakers. Its primary function is to rapidly cool, split, and extinguish the electrical arc that forms when the breaker's contacts open to interrupt current flow. This prevents sustained arcing that could damage the breaker, cause electrical fires, or fail to clear a fault. It typically consists of a stack of insulated, metallic splitter plates housed in a chamber that elongates and deionizes the arc plasma. The chamber is made of heat-resistant ceramic or polymer, while the splitter plates are often steel or copper alloy. The arc chute is rated for voltages from 400 to 690 V AC, continuous currents from 16 to 630 A, and breaking capacities from 10 to 50 kA, per IEC 60947-2. Arc extinguishing time ranges from 10 to 30 ms. Operating temperature range is -40 to 85 °C, with degrees of protection from IP20 to IP54. Insulation voltage is 1000 V, and dielectric withstand voltage is 2.5 to 6 kV. Contact gap is 8 to 20 mm. Dimensions vary from 50×30×40 mm to 200×100×150 mm, and weight from 0.2 to 2.5 kg, depending on current rating and number of poles. These values are reference ranges; verify model-specific data with the manufacturer. The arc chute is a component, not a standalone product, and its performance must be validated within the circuit breaker assembly. It is not a user-serviceable part; replacement should be done by qualified personnel. For procurement, confirm compatibility with the specific breaker model and applicable standards.

Working Principle

When the circuit breaker contacts open and an arc is struck, the arc is driven by magnetic forces and thermal expansion into the chute. The chute's structure, often a series of parallel splitter plates, divides the main arc into a series of smaller, shorter arcs in series. This increases the total arc voltage beyond the system voltage, forcing current to zero. The plates also provide a large surface area to cool the arc plasma through thermal conduction and deionization, aiding in rapid extinction.

Common Materials

Heat-resistant ceramic or polymer (chamber housing), Deionizing splitter plates (often steel or copper alloy)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Voltage	400–690 V AC	Maximum voltage for arc extinction capabilityIEC 60947-2
Rated Current	16–630 A	Continuous current ratingIEC 60947-2
Breaking Capacity	10–50 kA	Maximum short-circuit current that can be interruptedIEC 60947-2
Arc Extinguishing Time	10–30 ms	Time to fully extinguish arc after contact separation
Operating Temperature Range	-40–85 °C	Ambient temperature limits for reliable operationIEC 60947-1
Degree of Protection	IP20–IP54	Protection against dust and water ingressIEC 60529
Material	Ceramic/Steel	High-temperature resistant arc chute material
Weight	0.2–2.5 kg	Depends on current rating and number of poles
Dimensions (L×W×H)	50×30×40 – 200×100×150 mm	Varies with rated current and breaking capacity
Insulation Voltage	1000 V	Rated insulation voltage for dielectric strengthIEC 60947-1
Contact Gap	8–20 mm	Distance between contacts when open; affects arc voltage
Dielectric Withstand Voltage	2.5–6 kV	Withstands overvoltage without breakdownIEC 60947-1

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

Splitter Plates Part
Divide the main arc into multiple series arcs to increase total arc voltage and provide cooling surfaces.

Material: Steel or copper alloy
Chamber Housing
Contains and directs the arc into the splitter plate array, providing insulation and structural support.

Material: Heat-resistant ceramic or polymer
Arc Runner / Horns Part
Guides the arc root away from the main contacts and into the chute entrance.

Material: Copper alloy

Applied To / Applications

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

Output Circuit Breakers

View system integration details

Manufacturers of Arc Chute / Extinguisher

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Frequently Asked Questions

What is the primary function of an arc chute?

The arc chute rapidly cools, splits, and extinguishes the electrical arc that forms when circuit breaker contacts open under load, preventing damage and ensuring safe interruption.

What materials are typically used in an arc chute?

The chamber housing is made of heat-resistant ceramic or polymer, and the splitter plates are often steel or copper alloy.

What are the typical rated voltage and current ranges?

Rated voltage is 400–690 V AC, and rated current is 16–630 A, per IEC 60947-2. These are reference ranges; confirm for the specific model.

How should I verify the arc chute's suitability for my application?

Check the circuit breaker's specifications, including voltage, current, breaking capacity, and environmental conditions, against the arc chute's reference parameters. Always consult the manufacturer for model-specific data.

Data Basis

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

Preliminary Technical Classification

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pressure:	Atmospheric to 1.5 bar (typical enclosure pressure)
other spec:	Rated voltage: 0.4-36kV, Breaking capacity: 10-63kA, Arc extinction time: <100ms
temperature:	-40°C to +125°C (operating), up to +200°C (transient arc exposure)

Arc Chute / Extinguisher

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards