Square D A6.20 4810V 4.33-4.90A Overload Relay

Square D A6.20 is a melting‑alloy thermal overload unit that acts as the heat‑sensing element in Square D’s A‑series overload relays and motor starters. It is designed to protect small to mid‑size motors by opening the circuit when excess current is drawn, using a fixed 4.33–4.90 A full‑load current range to tailor protection to the motor’s rating. The unit is intended for 600 V AC operation and is configured in frame size A, aligning with Square D A6‑series assemblies for easy field replacement in control panels. As a thermal actuator, the A6.20 is a replaceable component of the overload relay assembly, allowing technicians to swap the heating element without replacing the entire relay if trip characteristics are aligned with the motor’s FLA. This thermal unit is commonly used with Square D contactors and motor control circuits in industrial equipment such as conveyors, pumps, fans, and other equipment requiring reliable overcurrent protection. When selecting, confirm the motor’s full‑load current and ensure compatibility with the A6.20’s current range and voltage rating to maintain proper protection.