Alternating

• CR Magnetics
  
  Current transformers, voltage transformers, power transducers, current transducers and hall effect devices for alternating and direct current. ...
  http://www.crmagnetics.com/

• EGRA
  
  EGRA - stands for high-quality. For many years, EGRA has been a guaranteed producer of high-class products and ideas connected with high-voltage technology and electrostatics. The company was founded by an extraordinary man, Egon Graf, who first beca ...
  http://www.egra.de/english.htm

• Shenzhen Sensor Electronic Technology Co., Ltd
  
  Shenzhen Sensor Electronic Technology Co., Ltd specializes in research, development, and manufacturing of Electrical transducer. Our advanced test instrumentation and engineering capabilities provide a most favorable environment for transducer manufa ...
  http://www.ce-transducer.com/