Ref620 Technical Manual Guide

| Document Type | Document ID Example | Purpose | |---------------|--------------------|---------| | | 1MRS758457 | Full functional description, settings, logic, communication, and technical data. | | Operation Manual | 1MRS758456 | Daily operation: reading values, acknowledging alarms, local control. | | Installation Manual | 1MRS758455 | Mechanical mounting, wiring, grounding, and terminal identification. | | Application Note | 1MRS758458X | Specific use cases (e.g., REF620 with capacitor banks or arc flash detection). | | Product Guide | 1MRS758454 | High-level features, ordering codes, and basic specifications. |

Many users confuse the technical manual with other ABB documents. Here is a clear distinction: ref620 technical manual

If you have worked on feeder protection in a distribution network, you have likely encountered the REF620. As part of ABB’s (now Hitachi Energy) Relion product family, this Intelligent Electronic Device (IED) is a workhorse for overcurrent and arc flash protection. | Document Type | Document ID Example |

. It was throwing a "Directional Overcurrent" trip that made no sense—the feeder was healthy, but the breaker had snapped open like a startled trap. | | Application Note | 1MRS758458X | Specific use cases (e

Characterised by functional scalability and a withdrawable-unit design, allowing for easier maintenance and testing. Standards Compliance: Fully supports the IEC 61850 standard

The introductory chapters do more than just introduce the product; they define the functional scope. This section is critical when verifying that the relay matches the requirements of your specific project. It outlines the hardware variants (e.g., draw-out vs. fixed, different current transformer ratings) and available optional modules. If you are questioning whether the REF620 supports a specific communication protocol like IEC 61850 or DNP3, the answer begins here.