Schneider Electric 9065ST420 Overload Relay

Schneider Electric's Square D 9065ST420 is a solid-state motor-logic overload relay designed to protect three-phase motors in Square D Type S starters. Housed in a NEMA Size 4, three-pole package, the overload relay covers full-load currents from 45 A to 135 A and handles voltages up to 600 V AC. As a drop-in replacement for older melting-alloy or other overload relays, 9065ST420 integrates with existing Square D control circuits to deliver reliable protection without rewiring; it is part of the Motor Logic family, offering solid-state sensing for fast, precise protection. The unit is intended for surface mounting within control panels and supports standard three-phase protection schemes, ensuring consistent trip performance across all phases. Typical applications include protecting motors in pumps, fans, conveyors, machine tools, and other industrial equipment where dependable overload protection is essential and where compatibility with Square D Type S starters is required.