Omron Electronic Components Europe (OCB-EU) has launched a pre-charge relay aimed specifically at electric and hybrid vehicles and other heavy duty battery powered systems. The new Omron G9EJ-1 is specifically designed for use in pre-charge circuits used in electric vehicles and other battery systems to reduce the very high inrush currents on start-up. Before the vehicle or system is fully started, the pre-charge circuit is switched on briefly to charge capacitors in the controller and inverter through a current-limiting resistor. The G9EJ-1 is specifically designed to switch in this circuit, and is a cost-effective solution that can support up to 25A at 400VDC.
Omron has designed the G9EJ with a proprietary contact driving system that enhances the inrush current performance and ensures a long service life under these conditions. The G9EJ also features a high efficiency magnetic circuit which helps extinguish magnetic arcs which can damage the contact surface. The relay is amongst the smallest solutions of its type in the industry, sized at just 30mm x 27mm x 31mm and weighs around 50g.
The Omron G9EJ-1 complements the Omron range of power relays for the electric vehicle main power relays, which switch in the full motor circuit once the pre-charge phase is complete. These include the G9EC which can switch up to 200A at 400VDC.