Caterpillar Inc. 5N-5510 Reverse Power Relay

Caterpillar's 5N-5510 Reverse Power Relay is a protective CAT component designed to guard generator systems against reverse power flow by sensing power direction and triggering protective action when reverse conditions are detected. Cataloged as 5N-5510 and listed in Caterpillar's parts catalog as a RELÉ, it is intended to be integrated into CAT electrical protection schemes rather than used as a standalone switch. The 5N-5510 is specified for use with a broad range of Caterpillar engines and generator configurations, including 3304, 3306, 3208, and 3408 families, with compatibility also noted across 3406C/3406B variants as well as 3412C, 3512/3512B, 3508B, 3516/3516B lines. In CAT installations, it works with other protection devices to ensure rapid disconnection in the event of reverse power, helping prevent damage to the generator, wiring, and connected loads. As a genuine CAT spare part, it is designed for durable field service on CAT-powered gensets, and its compact form factor allows straightforward replacement in various electrical cabinets.