For pre-charge save space and cut BOM
Omron Electronic Components Europe has extended its contactor-replacement relay portfolio with the G9KJ to reduce weight and costs in high-voltage energy storage systems and EV fast chargers. With 25A make current and 5A carry current, the compact PCB-mount relays have ratings optimised for pre-charging circuits at DC-link voltage up to 1500V
As pre-charge control switches, the Omron G9KJ relays can divert capacitive inrush currents through a high resistance to relieve stress on components handling the main charging current, including the main contactor, DC link capacitor, and trip protection. Helping to prevent nuisance faults or unwanted system resets, and enhancing long-term reliability of the power stage, G9KJ relays enable greater board integration and faster assembly.
The 37.2mm x 25.5mm x 17mm type 1A relays address the growing reliance on high-voltage DC switching capabilities as the energy transition redefines grid infrastructures and life essentials such as mobility. Continued integration of renewables into the energy mix is increasing demand for efficient, high-capacity energy storage systems operating at voltages between 600V and 1000V to ensure grid stability. EVs are also tending towards higher vehicle-battery voltages, already reaching 1000-1500V in some vehicles, for faster charging, reduced weight, and increased drive power.
Omron’s G9KJ relays provide an alternative to general-purpose high-voltage parts, enabling designers to ensure pre-charging circuits are specified for optimal rating, reliability, cost, and size. With contact resistance of just 100mΩ (max.) and 530mW coil power, the relays support the quest for efficiency and energy-conscious design.
