Allen-Bradley 800MR-A9 USNT Motor Reversing Relay

Allen-Bradley 800MR-A9 USNT Motor Reversing Relay is a compact control device from Rockwell Automation’s 800MR family that provides reversing capability for electric motors in industrial control panels. Used in forward/reverse applications, it coordinates with standard control components to switch rotation by routing power through alternate circuit paths, enabling a motor to run in either direction from a single control station. The A9 USNT variant identifies this particular model within the 800MR lineup. Typically, it is employed alongside Allen-Bradley pushbuttons, interlocks, and overload protection as part of a reversing control scheme, allowing operators to start, stop, and reverse a motor with coordinated logic. Being part of the long-running 800 control platform, the 800MR-A9 USNT is suited for applications such as conveyors, machine tools, hoists, or other equipment where bidirectional motor operation is required. This description reflects the model’s intended use to provide simple, reliable reversing action within a Rockwell Automation-compatible control architecture.