Siemens Allis OLR0320 Overload Relay is a 3‑pole thermal overload device designed to protect three‑phase motors in Siemens Allis/Allis‑Chalmers motor starters. It provides a current range of 2 to 3.2 A and is rated for up to 600 V AC. The unit is Class 10 and mounts on a DIN rail with screw‑terminal wiring for easy integration with compatible contactors. In the protected circuit it supports up to a 12 A fuse and up to a 15 A circuit breaker. This specific OLR0320 model is listed as discontinued by the manufacturer, which can affect replacement availability.
