SURGE PROTECTION Powering the future: KH-AT series automotive-grade MOVs

Related Vendors

KOA Europe GmbH

Rogers Corporation

MERSEN France SB

As the automotive industry accelerates toward electrification and data centers scale rapidly to support AI workloads, the demand for robust and reliable circuit protection has never been greater. YAGEO Group intrroduced the KH-AT Series, a new family of AEC-Q200 qualified, automotive-grade Metal Oxide Varistors (MOVs) engineered to deliver long-term reliability in the harshest operating environments.

Designed for stability and endurance, the KH-AT Series combines high surge capability, effective voltage clamping, and automotive-grade ruggedness, making it an ideal protection solution for modern power electronics.

Engineered for Harsh Environments The KH-AT Series is purpose-built for demanding automotive and industrial conditions. Featuring a silicone coating, these through-hole (THT) MOVs offer enhanced resistance to high temperatures, humidity, and mechanical stress. The series is fully compliant with AEC-Q200 Rev. E, ensuring suitability for safety-critical applications.

Reliability is validated through extensive qualification testing, including: Thermal Cycling: 1,000 cycles from –40°C to +125°C Biased Humidity: 1,000 hours at 85°C / 85% RH with applied bias Operational Life: 1,000 hours at 125°C maximum operating temperature Storage Capability: Rated for –40°C to +150°C

These results demonstrate the KH-AT Series’ ability to maintain stable electrical performance over extended service life.

Key Technical Specifications To support a wide range of design requirements, the KH-AT Series is available in 7 mm, 10 mm, 14 mm, and 20 mm disc diameters.

Operating Voltage: 130 Vac to 750 Vac (170 Vdc to 990 Vdc) Surge Capability (8/20 μs): 1,750 A (7 mm) 3,500 A (10 mm) 6,000 A (14 mm) 10,000 A (20 mm) Global Certifications: UL, CSA, and TUV recognized

This broad voltage and surge coverage enables flexible protection design across multiple platforms.

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Target applications: from EVs to AI servers

The KH-AT Series is positioned to protect critical systems across high-energy and high-reliability markets: Automotive On-Board Chargers (OBC) Ideal for AC input protection in 3.3 kW to 22 kW OBCs, the KH-AT Series safeguards power stages against differential and common-mode surges in integrated charging systems and AC/DC converters.

AI Server & Rack Power Supplies Beyond automotive applications, the KH-AT Series is well suited for rack power supplies in AI server architectures, including large-scale GPU systems such as GB200-class platforms. Its high surge endurance supports power shelves and battery backup units in data-center environments where uptime is critical.

Industrial & Telecom Infrastructure with high energy absorption capability, KH-AT MOVs are also suitable for industrial power modules, renewable energy systems, and telecom base stations, offering dependable protection against transient overvoltages.

Manufacturing Advantage: Reflow-Soldering Capable A key differentiator of the KH-AT Series is its ability to withstand up to three reflow soldering cycles. This capability enables manufacturers to eliminate wave soldering, simplifying production flow and reducing assembly costs—particularly in hybrid PCB designs combining SMD and THT components.

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