A Four-Pole (FR) Isolator rated 40–63 A is a manually operated switch designed to disconnect all three phase conductors along with the neutral in three-phase systems. It ensures complete isolation of the power supply during maintenance, installation, or emergencies, providing safety for equipment and personnel. With current ratings between 40 A and 63 A and voltage handling up to 415 V AC, these isolators are DIN-rail or surface mountable, offer clear ON/OFF indication, and often include padlock features. Built to IEC 60947‑3 standards, they are commonly used in industrial control panels, commercial switchboards, and solar PV setups for reliable, full-circuit disconnection.