The alumina ceramic housing of the high‑voltage DC relay is made from 95% alumina ceramic and features partial metallization and hermetic sealing, offering superior insulation and dielectric strength, vacuum arc extinction, and thermal‑shock resistance and explosion‑proof performance. It is well suited for high‑voltage, high‑current applications such as new‑energy vehicles and charging stations.

Alumina Ceramic Housing for High-Voltage DC Relays

Product Overview

The alumina ceramic housing for high-voltage DC relays is a core structural component specially designed to match high-voltage, high-current electrical devices. It is manufactured using 95% alumina ceramic as the primary material, with select areas metallized and sealed. This allows direct hermetic sealing to metal cover plates via vacuum welding. The internal cavity accommodates the relay contact mechanism, providing a high-vacuum or inert-gas encapsulation environment that ensures stable operation of high-voltage DC relays, DC contactors, and similar equipment.

Product Structure and Manufacturing Process

This alumina ceramic housing utilizes 95% alumina ceramic as its base material, which inherently possesses excellent physical and chemical properties. To meet sealing requirements, metallization and sealing processes have been applied at designated edges and openings, coating the ceramic surface with a metal layer compatible with welding techniques. This enables direct vacuum welding to metal cover plates without additional surface treatment, achieving superior sealing performance after assembly. The sealed cavity provides an airtight environment completely isolating the internal contact mechanism from external air, satisfying high-vacuum or inert-gas encapsulation needs.

Key Performance Advantages

1. Excellent Insulation and Voltage Withstand Capability: The ceramic material exhibits exceptional insulation, capable of enduring high-voltage DC operating conditions, effectively preventing creepage, breakdown, and other insulation failures, thus ensuring electrical safety in high-voltage circuits.
2. Efficient Vacuum Arc-Extinguishing Ability: After sealing with the metal cover plate, a closed cavity is formed, which can be filled with vacuum or inert gas. When contacts open or close and generate an arc, the enclosed special environment rapidly extinguishes the arc, protecting the contacts from erosion and significantly extending the service life of relays, contactors, and similar devices.
3. Reliable Temperature Resistance and Explosion-Proof Performance: The ceramic material boasts outstanding high-temperature resistance and overall mechanical strength, tolerating the transient high temperatures generated by arcing during contact operations. This prevents shell cracking, contact explosions, and other safety hazards, enhancing the operational reliability of high-voltage equipment.

Application Scenarios

This alumina ceramic housing is specifically engineered for high-voltage, high-current electrical equipment, primarily used in applications such as high-voltage relays for electric vehicles, public charging stations, energy storage systems, and DC contactors—environments characterized by high voltage and current. It meets the critical demands of various high-voltage DC switching devices for structural sealing, insulation protection, and temperature-resistant explosion-proof features, providing essential structural support for stable operation of high-voltage electrical equipment.

Target Customer Base

The primary customer segments served by this product include manufacturers of high-voltage DC relays, developers and producers of DC contactors, suppliers of high-voltage electrical systems for electric vehicles, manufacturers of charging station equipment, providers of core components for energy storage systems, and cross-border traders of high-voltage electrical components—catering to the diverse needs of high-voltage, high-current switching devices requiring ceramic-sealed housings.

Solving Industry Pain Points

1. Addressing the insufficient insulation performance of traditional high-voltage relay housings, which are prone to creepage and breakdown, by leveraging the robust insulating properties of 95% alumina ceramic to ensure electrical safety under high-voltage conditions.
2. Overcoming the poor sealing performance of conventional housings, which cannot achieve vacuum or inert-gas encapsulation, leading to contact erosion by arcs and shortened equipment lifespans. Through metallized sealing followed by vacuum-welded hermetic sealing, the housing achieves superior airtightness, while its vacuum arc-extinguishing characteristics extend equipment lifespan.
3. Tackling the inadequate temperature resistance and insufficient mechanical strength of standard housings, which easily crack under arc-induced high temperatures and pose safety risks. By capitalizing on the high-temperature resistance and high strength of alumina ceramic, this product enhances the operational safety and reliability of high-voltage equipment.

Frequently Asked Questions (FAQ)

Q1: What material is used for this alumina ceramic housing?
A: This product is crafted from 95% alumina ceramic as its core raw material, offering excellent insulation, temperature resistance, and high-strength properties.
Q2: Does the product require additional surface treatment before welding?
A: The product has already undergone metallization and sealing at designated edges and openings, eliminating the need for extra surface treatment; it can be directly vacuum-welded to metal cover plates.
Q3: Which types of equipment is this ceramic housing compatible with?
A: Designed specifically for high-voltage, high-current applications, this product fits high-voltage relays for electric vehicles, charging stations, energy storage systems, DC contactors, and other high-voltage DC switching devices.
Q4: What are the key performance advantages of this product?
A: The product delivers three major advantages—strong insulation and voltage withstand capability, efficient vacuum arc-extinguishing ability, and reliable temperature resistance and explosion-proof performance—effectively enhancing the operational stability and service life of high-voltage electrical equipment.