Surge suppressors, transient voltage, are used to protect against temporary excess voltage and/or current in an electrical circuit that has been disturbed. Surge suppressors, transient voltage can be AC single phase, AC three phase, or DC dataline.  AC single-phase units are configured to suppress surges, spike, transients, etc., on single-phase AC power lines.  AC three phase units are configured to suppress surges, spike, transients, etc., on three phase AC power lines.  DC or dataline units are configured to suppress surges, spike, transients, etc., on DC data, phone, and signal lines.  Surge suppressors, transient voltage can also be power conditioners.  A power conditioner is a unit with full power conditioning capabilities, including functions such as voltage regulation in combination, output isolation, noise and spike attenuation, harmonic filtering, etc., to ensure the quality and consistency of power to sensitive medical, laboratory, computer, and other high technology equipment.