The CC121.0 Thermal Unit from Square D (Schneider Electric) is a melting‑alloy thermal unit that provides Class 20 overload protection for industrial motors in Square D motor‑control assemblies. It is rated for a full‑load current of 63.6–74.9 A and is designed for use with up to 600 VAC circuits, with a 40 °C ambient rating, and it is intended to work with the related overload relays and motor starters. This 20‑trip Class unit (CC121.0) serves as a replacement thermal unit for Square D overload relay systems, enabling precise thermally triggered protection for motor loads.
