The Citel 4-20 mA surge protectors are designed to protect instruments and control systems against lightning surges and electrical transients. Designed to protect SCADA and RTU systems, they come in two wires and four wires current loops sizes. The surge protectors are also available for multi-circuit applications up to 64 wires. DIN rail mount versions are available. Citel 4-20 mA protectors use a multistage circuitry that provides an ultra fast response time and a high power handling.