Unlocking High-Power Switching with Omron's G9K Relay Series
G9KA, G9KB, G9KC PCB power relays
In the rapidly evolving landscape of renewable energy, electric vehicles (EVs), and industrial automation, the demand for reliable high-voltage and high-current switching solutions is greater than ever. Omron's G9K relay series rises to this challenge, offering compact, efficient, and robust relays designed to handle the toughest power management tasks.
Introducing the Omron G9K Series
The Omron G9K series encompasses a family of high-capacity relays engineered for switching both AC and DC loads at elevated voltages and currents providing a trusted and proven alternative to Contactors. These relays integrate:
- Advanced contact technology for minimal resistance lowering heat dissipation and maximum durability
- Dependable double break contact structure enhancing safe disconnection
- Arc suppression mechanisms (G9KB) ensuring durable DC switching.
- Energy-efficient coil and contact designs maximizing endurance and reducing operational costs.
They serve critical roles in sectors like EV charging infrastructure (EVSE) energy storage, energy generation (PV Inv.) UPS industrial automation, and renewable energy systems.
Key Models in the G9K Series:
G9KA – Ultra-low resistance AC power relay.
G9KB – High-voltage, bidirectional DC power relay.
G9KC – Compact four-pole AC relay with safety feedback (Aux contact).
G9K Series Model Comparison
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Model |
G9KA |
G9KB |
G9KC |
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Configuration |
SPST-NO (Double-break) |
SPST-NO (Bidirectional) |
4PST-NO + Aux (Option) |
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Max Voltage & Current |
Up to 1000 VAC, 300A carry |
Up to 800 VDC, 100A |
Up to 800 V480 VAC, 40A per poleDC, 100A |
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Coil Voltage |
12V / 24V DC |
12V / 24V DC |
12V / 24V DC |
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Contact Resistance |
0.2 mΩ |
≤5 mΩ |
≤6 mΩ |
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Key Features |
Twin-contact design, ultra-low resistance, ideal for inverters |
Arc cut-off tech, bidirectional DC, energy storage focus |
Multi-phase AC switching, mirror contact for safety |
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Shop |
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Datasheet |
Replacing Contactors with PCB-Mounted Solutions
One of the standout advantages of the Omron G9K series is its ability to replace traditional general purpose and industrial contactors in high-power applications. Conventional contactors, while robust, are typically bulky, require screw terminals, involve complex wiring, and consume valuable panel space whilst generally also have high coil powering needs. The G9K relays offer a modern alternative by delivering equivalent or superior performance in a compact, PCB-mountable format.
Why Engineers Choose Omron’s G9K Series
- Optimized Thermal Management: Low contact resistance helps achieve optimized and reduced heat dissipation contributing towards extending electrical life
- Robust Safety Standards: UL, IEC, VDE certifications streamline product compliance.
- Space-Saving Designs: High-capacity switching in PCB-friendly formats.
- Energy Efficiency: Coil economization across the series reduces operational costs.
- Advanced Arc Handling: Critical for modern DC systems where safety and longevity are paramount.
Access detailed datasheets, CAD files, and integration support through Omron’s official portal or authorized technical distributors. For design assistance, Omron’s engineering team offers consultation services tailored to your application needs.