Fairchild 750-314 Automatic Signal Lock

The Fairchild 750‑314 Automatic Signal Lock is an industrial signal conditioning device designed to automatically hold (“lock”) a 4–20 mA control signal at its last valid value upon loss or fault of the input signal, thereby maintaining stable process operation and preventing sudden control disturbances in instrumentation and control systems. Technical specifications Manufacturer: Fairchild Industrial Products Company Product type: Automatic signal lock / signal holding module Model: 750‑314 Input signal type: Analog current Input signal range: 4–20 mA Output signal type: Analog current Output signal range: 4–20 mA Signal function: Holds last input signal value on input failure Supply voltage: 115 VAC Supply frequency: 50/60 Hz Power consumption: 3 W Input impedance: High impedance current input Output drive capability: Standard 4–20 mA loop loading Response behavior: Automatic lock on loss of input signal Fail‑safe operation: Maintains last valid output value Electrical isolation: Limited isolation suitable for industrial control panels Adjustment: Factory set, no routine field calibration required Indicator: No external display, internal signal locking circuit Enclosure material: Painted metal enclosure Mounting type: Panel or surface mount Wiring connection: Screw terminals Operating temperature range: 0 to 60 °C (32 to 140 °F) Storage temperature range: −40 to 85 °C (−40 to 185 °F) Operating humidity: Up to 95% RH, non‑condensing Typical applications: Process control loops, pneumatic and electronic instrumentation interfaces, signal protection Standards and approvals: Designed for industrial control system use Country of manufacture: United States of America Please review pictures carefully and let us know if you have any questions!