The EL500 and EL1000 series, engineered by Zentro-Elektrik, are a programmable DC electronic loads that features a 500W and 1000W of power respectively. They run on a 2.5 - 20V and on a 5 - 800V of load voltage with a single input of load. In addition, these devices are built with a table case design and a plug-in 19 inch rack unit.