509-EOD Motor Starter Unit

Feature & Principle

It works on electromagnetic attraction principle. When the control coil is energized, the main contacts close to switch on the three-phase motor circuit. The built-in eutectic alloy overload relay monitors motor current and trips to cut off power under overload condition. Auxiliary contacts provide status feedback for interlock and alarm circuits.

Specifications

Model: 509-EOD Brand: Allen‑Bradley (Rockwell) NEMA Size: 4 Control coil: 115‑120V 60Hz Structure: Open type, non-reversing Overload: Eutectic alloy overload relay Mounting: MCC bucket / panel mount Certification: UL, CE

Components & Diagnostics

Electromagnetic coil, main contact assembly, eutectic overload relay, auxiliary contact block, arc chute, metal base frame. Common faults: coil burnout, contact ablation, false overload tripping, contact sticking.

Product Brief

509-EOD motor starter, Rockwell power spare widely used for pump, fan, compressor and MCC cabinet three-phase motor control.