IN Brief:
- OMRON’s new G9KD relay is aimed at high-voltage DC switching in energy storage systems and EV charging hardware.
- The part is designed to replace larger contactors in some applications, extending PCB integration and automated assembly deeper into power equipment.
- As ESS and charger platforms move to higher DC bus voltages, compact isolation components with strong thermal and diagnostic performance are becoming more important.
OMRON has introduced the G9KD, a PCB-mount power relay aimed at utility storage systems and high-power EV charging hardware, as designers push more switching and isolation functions onto the board rather than relying on bulkier contactors.
The relay supports switching up to 1,500V DC, with rated carry and maximum breaking current of 150A at 70°C and 100A at 85°C. OMRON also specifies 12kV withstand voltage between coil and contact, a minimum 6mm contact gap, and initial contact resistance of 4mΩ or less, figures intended to support high-voltage DC architectures without adding unnecessary conduction loss or thermal burden.
In energy storage systems, the G9KD is positioned for power-conditioning circuits where safe isolation has to coexist with tighter enclosure packaging and more automated manufacture. In EV fast chargers, it is also intended for charger control units and switching networks that allow charging power to be reconfigured dynamically between vehicles and service equipment. The attraction is the ability to replace traditional contactors with a PCB-mounted device, extending board-level integration deeper into assemblies that have often remained manual.
The SPST normally open relay measures 60.5mm by 43.5mm by 56.5mm, which gives equipment makers more scope to reduce control-section footprint or release space for thermal management and busbar design elsewhere in the cabinet. An optional 1A auxiliary contact, using a normally closed mirror-contact arrangement conforming to IEC/EN60947-4-1, adds a route to contact-failure monitoring and diagnostic feedback without extra discrete hardware.
The G9KD is already in production, with G9KD-1A and G9KD-1A1B variants listed by OMRON as storage and charging equipment continues to move toward higher DC bus voltages and tighter integration.
