Acrel. 

Acrel Co.,Ltd. researches, develops, produces, and sells equipment and systems required for energy efficiency management of medium and low voltage for enterprise microgrids in China. The company offers energy management products, such as din rail energy, multifunction power, DC energy, wireless energy, and prepayment energy meter, as well as smart gateway; and power monitoring protection products, which include programmable smart meter, data center monitor device, PV/solar inverter energy meter, real-time temperature measuring devices, protection and residual current relay, temperature and humidity controller, smart motor protector, remote terminal unit, and KNX smart lighting control module. In addition, it provides power sensor's comprising current transformers, hall effect current sensors, and analog signal isolators, as well as AC current, power, and rogowski coil transducer; isolated distribution for medical and industrial IT; power quality management products, including active power filter and static Var generator; and installation services. The company was incorporated in 2003 and is based in Shanghai, China.