OMRON extends its G9EK screw-terminal series with the 250A/500VDC G9EK-1-EX relay. Designed for EV charging, e-mobility and renewables, it offers low-resistance switching, shock tolerance up to 100g and gasless efficiency in a compact footprint. The new G9EK‑1‑EX handles up to 250A at 500VDC, expanding the capabilities of the existing G9EK‑1‑E device while maintaining the same compact outline.

The relay’s internal architecture has been refined to deliver just 15mΩ contact resistance when closed, with coil power consumption of 4W. That balance of low losses and high switching performance makes it a practical alternative to bulkier high-current contactors, especially where efficiency and space are at a premium.

Mechanical and electrical resilience have also been key to the redesign. The G9EK‑1‑EX can withstand shocks up to 100g, ensuring dependable performance in mobile and industrial environments such as autonomous guided vehicles (AGVs). Its terminal structure limits magnetic repulsive forces generated by large transient currents, helping to extend contact life and reduce maintenance cycles under fault scenarios like short circuits.

The device supports interruption of up to 1000A at 400V and can tolerate voltage pulses as high as 4000V. Despite its high current and voltage handling, the gasless contact mechanism simplifies assembly, avoids the use of sealed gas chambers and contributes to a more sustainable design approach. Fast actuation is another design focus, with a 50ms operating time, 30ms release time and mechanical endurance rated at 200,000 cycles.

With these characteristics, OMRON’s latest addition to the G9EK family targets engineers building next‑generation power systems that demand high current capacity, compact design and safety assurance across transport electrification and renewable energy infrastructure.

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