Structured Manufacturing Data (2026)

Gas Discharge Tube (GDT)

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Gas Discharge Tube (GDT) used in the Computer, Electronic and Optical Product Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Gas Discharge Tube (GDT) is characterized by the integration of Electrodes and Gas Chamber. In industrial production environments, manufacturers listed on CNFX commonly emphasize ceramic or glass envelope construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A protective device that uses gas ionization to divert high-voltage surges away from sensitive electronic circuits.

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Product Specifications

Technical details and manufacturing context for Gas Discharge Tube (GDT)

Definition
A gas discharge tube is a key component in line protection circuitry that provides overvoltage protection by creating a low-impedance path to ground when voltage exceeds its breakdown threshold. It functions as a fast-acting switch that activates during voltage transients, lightning strikes, or electrostatic discharge events to protect downstream equipment.
Working Principle
The GDT contains inert gas (typically neon, argon, or xenon) between two or more electrodes. Under normal operating conditions, the gas remains non-conductive. When voltage exceeds the tube's breakdown voltage, the gas ionizes, creating a plasma that conducts current and shunts the surge to ground. Once the surge passes and current drops below the holding current, the gas deionizes and returns to its high-impedance state.
Common Materials
ceramic or glass envelope, metal electrodes (copper, nickel, or tungsten), inert gas mixture (neon/argon/xenon)
Technical Parameters
  • DC breakdown voltage rating (kV) Standard Spec
Components / BOM
  • Electrodes Part
    Provide electrical connection points and initiate gas ionization
    Material: copper or nickel alloy
  • Gas Chamber
    Contains inert gas mixture at controlled pressure for ionization
    Material: ceramic or glass
  • Terminals Part
    External connection points for circuit integration
    Material: tin-plated copper

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Gas Discharge Tube (GDT).

high voltage surge protection GDT gas discharge tube for electronic circuits ceramic envelope gas arrester inert gas mixture surge diverter GDT protection computer manufacturing

Applied To / Applications

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

Line Protection Circuitry
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric to 1.5 bar
other spec: Surge current: 5kA to 100kA, DC spark-over voltage: 75V to 10kV
temperature: -40°C to +85°C
Media Compatibility
✓ Telecommunication lines ✓ Power supply circuits ✓ Data transmission lines
Unsuitable: High humidity or condensing environments
Sizing Data Required
  • Maximum continuous operating voltage (MCOV)
  • Surge current rating (kA)
  • DC spark-over voltage

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Dielectric breakdown
Cause: Overvoltage events exceeding GDT's rated voltage, causing permanent conductive path formation and loss of protection capability.
Electrode degradation
Cause: Repeated surge discharges causing electrode erosion, material migration, and increased leakage current over time.
Maintenance Indicators
  • Visible discoloration, cracking, or bulging of the ceramic or glass housing
  • Audible arcing or hissing sounds during normal operation indicating continuous discharge
Engineering Tips
  • Install GDTs with proper voltage ratings (typically 20-30% above operating voltage) and ensure correct coordination with other protective devices
  • Implement regular insulation resistance testing and visual inspections to detect early degradation before catastrophic failure

Compliance & Manufacturing Standards

Reference Standards
IEC 61643-11: Surge protective devices connected to low-voltage power systems - Requirements and test methods UL 1449: Standard for Surge Protective Devices EN 61643-11: Low-voltage surge protective devices - Surge protective devices connected to low-voltage power systems - Requirements and test methods
Manufacturing Precision
  • Electrode spacing: +/-0.05mm
  • Glass-to-metal seal hermeticity: <1x10^-8 atm·cc/sec helium leak rate
Quality Inspection
  • DC sparkover voltage test
  • Impulse current withstand test (8/20 μs waveform)

Factories Producing Gas Discharge Tube (GDT)

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

How does a Gas Discharge Tube protect electronic equipment?

A GDT protects by using gas ionization between electrodes to create a low-resistance path, diverting high-voltage surges away from sensitive circuits before they can cause damage.

What materials are used in GDT construction?

GDTs typically feature ceramic or glass envelopes, metal electrodes (copper, nickel, or tungsten), and inert gas mixtures like neon, argon, or xenon for reliable surge diversion.

Where are Gas Discharge Tubes commonly used in manufacturing?

GDTs are essential in computer, electronic, and optical product manufacturing for protecting sensitive components in power supplies, communication lines, and data interfaces from voltage spikes.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Computer, Electronic and Optical Product Manufacturing.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

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