# RITZ RCU Intelligent Instrument Transformer Controller & Monitor

> feeder-protection - Sensor and instrument transformer signal conditioning, overcurrent and voltage protection, digital Merging Unit (SAMU) interface and IEC 61850 Process Bus integration

**Voltformer canonical:** https://voltformer.com/product/ritz-rcu-intelligent-instrument-transformer-controller - markdown version: https://voltformer.com/product/ritz-rcu-intelligent-instrument-transformer-controller.md

## Overview

- **Brand:** Ritz Instrument Transformers
- **Product family:** RCU Series
- **Application:** Sensor and instrument transformer signal conditioning, overcurrent and voltage protection, digital Merging Unit (SAMU) interface and IEC 61850 Process Bus integration
- **Product type:** feeder-protection

## Protection & Control Functions

- **ANSI Functions:** 50/51, 50N/51N, 27/59, 50BF
- **Transformer Windings:** N/A (Feeder / Bay)
- **Supports Transformer:** No
- **Supports Feeder:** Yes
- **Supports Breaker Control:** No
- **Arc Flash Protection:** No

## Digital Integration & Protocols

- **IEC 61850 Edition:** Ed2.1
- **GOOSE:** Yes
- **Sampled Values (SV):** Yes
- **Redundancy (PRP/HSR):** Yes (PRP/HSR)
- **Protocols:** IEC 61850-9-2LE, IEC 61850-8-1, IEC 61869-9
- **Engineering Software:** RITZ Configurator

## Electrical Interface

- **Frequency:** 50/60 Hz
- **Nominal Current:** 1 A / 5 A
- **Auxiliary Supply:** 24-250 Vdc
- **Operating Temperature:** -40 to +75 °C

## Standards

- IEC 61869
- IEC 61850
- IEC 60255

## Sources

- https://www.ritz-international.com

- **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.