Yokogawa Electric Corporation AR-SA S3.0 Surge Arrester

The Yokogawa AR-SA S3.0 Surge Arrester protects 4–20 mA DC signal loops from transient overvoltages by absorbing lightning-induced or switching surges on the signal line. Used in control panels, marshalling cabinets, and instrumentation loops connected to transmitters and receivers, it helps maintain reliable signal integrity in process-control systems. Key specs include: manufacturer Yokogawa, model AR-SA S3.0, product type Surge Arrester (Signal Line Protection Device); signal type 4–20 mA DC (12–30 VDC loop); rated current 0–100 mA DC; maximum continuous voltage between lines 30 VDC and to ground 50 VDC; response time ~3 ns; discharge capacity up to 5000 A (8/20 µs); leakage current ≤5 µA (line), ≤10 µA (ground); series resistance ~33 Ω; construction plug-in type (main unit + terminal base); mounting on panel or DIN rail with adapter; function to protect instrumentation from transient overvoltage events. Common applications include protection of transmitters, PLC/DCS input cards, and signal wiring in oil & gas, chemical plants, power generation, and water treatment facilities. Common replacements include Yokogawa AR-HA, AR-TC, and AR-RT surge arresters.