The Schneider Electric A9A26479 is an iMSU overvoltage release from the Acti9 range — a control-circuit accessory that trips a downstream breaker or contactor when the monitored voltage exceeds 255 V. The part carries an action indicator for local signalling of the release state, and its clamp terminals accept up to 7 mm² rigid or 5 mm² flexible cable — sized for standard panel wiring.
Standards and environmental rating
The release is certified to EN/IEC 60947-5-1, the standard for control-circuit devices and switching elements. Tightening torque for the terminals is 1 N·m.