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Vacuum Relay | Guarding High-Voltage Switching with Ceramic Vacuum Sealing

2026/09/17

In the electrical world, a switch seems simple—just two actions: making and breaking a circuit. But when current climbs to hundreds of amperes and voltage reaches tens of kilovolts, what was once a crisp operation becomes troublesome: air breaks down, arcs burn fiercely, and contacts oxidize and erode. A single interruption can mean a single failure.

Working Principle

A relay is essentially an electromagnetic automatic switch that uses a small signal to control a large load: a tiny control current energizes a coil, generating electromagnetic force that moves the contacts to open or close, thereby indirectly controlling a high-voltage, high-current load circuit and achieving safe isolation between low-power control and high-power circuits.

GLVAC's vacuum relay seals its contacts inside a high-vacuum ceramic chamber, using vacuum as both the insulating and arc-extinguishing medium. It operates through four cooperating parts:

Ceramic vacuum-sealed chamber — a high-strength ceramic envelope housing a pair of stationary and moving contacts, evacuated to high vacuum; this is the core region for high-voltage isolation and arc extinction;

Armature mechanism — driven by electromagnetic force to perform precise linear or rotary motion, moving the moving contact to close or separate from the stationary contact;

Electromagnetic coil — the source that converts weak control signals into mechanical driving force;

External structure and terminals — mounting brackets, insulating housing, and coil and contact terminals, ensuring the device can be integrated into systems conveniently and securely.

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Performance Improvements

Using vacuum as the medium brings three key performance advantages:

Stronger insulation
Vacuum has excellent dielectric strength. For the same volume, the rated operating voltage of a vacuum relay is typically more than ten times that of ordinary non-sealed relays.

Faster arc extinction
With few gas molecules to sustain conduction, arcs are difficult to form and maintain in vacuum. This gives the relay strong breaking capability, lower contact wear, and significantly extended service life.

A cleaner internal environment
The sealed chamber isolates the contacts from oxygen and moisture, preventing oxidation and corrosion, so long-term contact reliability remains stable.

Technical Features

High power — operates stably under demanding conditions of high voltage and high current.

High dielectric withstand voltage — peak operating voltage can reach up to 70 kVDC.

High reliability — contacts are fully isolated from the external environment and protected from erosion.

Long service life — vacuum effectively extinguishes arcs; some models use wear-resistant tungsten contacts and can hot-switch loads.

Compact and lightweight — with a compact structure, the smallest models in the vacuum relay series weigh only 21 g, supporting the trend toward miniaturization and high integration in modern equipment.

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Application Areas

Thanks to its combination of high-voltage resistance, fast arc extinction, light weight, long life, and high reliability, Guoli Electronics’ vacuum relay serves multiple high-end fields:

Shortwave communication, communication satellites, and radar — handling high-frequency antenna coupling switching and transmit/receive conversion, operating stably under high-voltage, high-current conditions.

Submarine cables — relying on its fully sealed vacuum chamber structure and strong insulation performance to work reliably under high-voltage, high-current conditions.

RF applications and semiconductors — used in RF communication tuning systems and semiconductor equipment matching network power supplies, providing precise switching and strong current-carrying capability.

High-voltage test instruments and precision instruments — meeting high-voltage isolation and detection requirements, suitable for high-voltage systems pursuing compact design.

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Its technical characteristics also make it suitable for cardiac pacemakers, magnetic resonance imaging systems, high-frequency antenna coupling devices, capacitor discharge, and other scenarios where low-power signals control high-power circuits.

From arc extinction in milliseconds to mechanical life spanning decades, GLVAC's vacuum relay always does the same thing: leaving complexity to the structure, and delivering certainty to the user.

In the future, GLVAC will continue to increase R&D investment, using innovation as its driving force to provide reliable core vacuum electronic components for high-end equipment.



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