Siemens 3UA70AA0G Overload Relay

Siemens 3UA70AA0G Overload Relay is a three-pole thermal overload relay (basic type 3UA70) designed to provide motor protection in Siemens low-voltage control schemes. The AA0G variant integrates with compatible Siemens contactors and is specified for a setting range of 0.4–6.3 A, allowing precise adjustment to the motor's full-load current and delivering a Class 10A trip characteristic for reliable shutdown during overload. Operating at 50/60 Hz, this relay is built for standard industrial use and mounts alongside the associated contactor assembly to protect three-phase motors such as conveyors, pumps, and fans used in manufacturing and processing environments. The 3UA70 family encompasses variants with different rated currents, with some configurations supporting motor currents up to about 12 A, depending on the exact model, making the AA0G suitable for smaller to mid-size motors within that range. As part of Siemens' traditional bimetal overload protection lineup, the relay provides established protection performance and ease of integration within Siemens motor control panels, coordinating with the control circuit to interrupt current during overheating conditions without acting as a standalone circuit breaker.