# ABB Relion REX640 All-in-One Protection IED

> feeder-protection - Modular all-in-one protection and control for feeders, transformers, motors and generators with multi-channel optical arc detection

**Voltformer canonical:** https://voltformer.com/product/abb-relion-rex640-all-in-one-protection-ied - markdown version: https://voltformer.com/product/abb-relion-rex640-all-in-one-protection-ied.md

## Overview

- **Brand:** ABB
- **Product family:** Relion REX640
- **Application:** Modular all-in-one protection and control for feeders, transformers, motors and generators with multi-channel optical arc detection
- **Product type:** feeder-protection

## Protection & Control Functions

- **ANSI Functions:** 50/51, 50N/51N, 67/67N, 87T, REF/87N, 49, 50BF, ARC, 27/59, 81, 79, 25
- **Transformer Windings:** 2, 3
- **Supports Transformer:** Yes
- **Supports Feeder:** Yes
- **Supports Breaker Control:** Yes
- **Arc Flash Protection:** Yes

## Digital Integration & Protocols

- **IEC 61850 Edition:** Ed2.1
- **GOOSE:** Yes
- **Sampled Values (SV):** Yes
- **Redundancy (PRP/HSR):** Yes (PRP/HSR)
- **Protocols:** IEC 61850 Ed.2.1, Modbus, DNP3, IEC 60870-5-104
- **Engineering Software:** PCM600

## Electrical Interface

- **Frequency:** 50/60 Hz
- **Nominal Current:** 1 A / 5 A / Rogowski sensor input
- **Auxiliary Supply:** 24-250 Vdc / 48-240 Vac
- **Operating Temperature:** -25 to +70 °C

## Standards

- IEC 60255
- IEC 61850 Ed.2.1
- IEEE C37.90
- UL Listed

## Sources

- https://new.abb.com/medium-voltage/digital-substations/ds-range-a-z

- **Source scope:** manufacturer-family
- **Last reviewed:** 2026-09-13

Manufacturer portfolio/family source. Confirm the exact order code, guaranteed ratings and project-specific options against the current OEM datasheet before procurement or an SLD study.

Technical ratings are configuration-dependent where stated by the manufacturer. Request project-specific verification before procurement.