Allen-Bradley 318163D Phase Sequence Monitor Relay

Allen-Bradley 318163D Phase Sequence Monitor Relay is a protective relay that watches the order of electrical supply phases to help safeguard equipment. The model is described as a 318163D Protective Relay with a 5A phase sequence specification and a 250VDC rating, making it suitable for inclusion in control panels and motor-control circuits that require phase-rotation verification. This Phase Sequence Monitor Relay comes from Allen-Bradley, a brand within Rockwell Automation, and is designed for industrial environments where reliable phase sequence sensing is essential. With its compact form factor and rugged construction typical of Allen-Bradley protective relays, the 318163D provides a straightforward way to detect incorrect phase sequence and trigger protective actions as part of a broader protection scheme. Key identifiers include the model number 318163D, the function phase sequence monitoring, the 5A rating, and the 250VDC specification, which together define its electrical interface and operating scope. It is well-suited for applications in electrical distribution and motor control where determining phase order is critical to prevent motor reverse rotation or equipment damage.