"Semiconductor technology is used to produce very compact electronic kWh meters as a replacement for electro-mechanical check meters. The meter range has variations for single phase, two phase, three phase 3\/4 wire balanced and 3\/4 wire unbalanced systems. In addition to the LCD display of kWhrs there is a galvanically isolated pulse output for use with separate counters, data loggers or similar electronic recorders or controllers. The compact circuitry employed allows these meters to be housed in a standard 3M or 4M DIN rail mount case."