Voltmeter Switches & Ammeter Switches Control Switches carries a large inventory of instrument switches in our warehouse. Csii stocks voltmeter switches for Line-to-Line or Line-to-Neutral connections or we offer a combination switch for both Line-to-Line and Line-to-Neutral applications. Separate ammeter switches are available from 1 to 4 C.T.'s. If you need a combination Ammeter/Voltmeter switch, we have a variety of those as well. Call Csii today, have your switch tomorrow!. Can't find what you need? No problem! Control Switches can design and build custom switches to your requirement. Specification Brochure: Instrumentation Brochure(2-pg PDF)