Schneider Electric RT-108 Thermal Overload Relay

The Schneider Electric RT-108 Thermal Overload Relay (Square D RT-108) is a motor-protection device designed to interrupt current when a motor overload or overheating condition occurs, protecting the motor from damage and helping prevent unscheduled downtime. Intended for use with compatible Square D/Schneider contactors in low‑voltage motor-control circuits, the RT‑108 integrates into standard starter assemblies to provide built-in thermal protection without external sensing. As part of Schneider Electric’s RT family, it uses a bi-metal thermal element to trip when the overload current exceeds the safe level, delivering a simple, durable protection solution for reliable operation. Typical applications include pumps, fans, conveyors, and other inductive loads in industrial automation where motor protection is critical.