Complete List of Relay Protection Icons

After a detailed analysis of the existing normative documentation (IEC and IEEE / ANSI), I have compiled a complete list of currently valid relay symbols. Relay symbols play a critical role in underst...

Industry
May 24, 2026

ANSI codes and IEC Relay Symbols – Electrical Engineering

To assist the Protection Engineer in converting from one system to the other, a select list of ANSI device numbers and their IEC equivalents are given in the following figure.

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Industry
Oct 31, 2025

ANSI Standard Device Numbers & Common Acronyms

ANSI Standard Device Numbers & Common Acronyms ANSI Standard Device Numbers & Common Acronyms

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Industry
May 05, 2026

ANSI CODES FOR PROTECTION FUNCTIONS

Each protective function is indicated by a specific no. such as 50 for instantaneous overcurrent protection and 59 for overvoltage protection. Following is the list of the functions.

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Industry
Oct 27, 2025

Table of ANSI IEEE Standard Device Numbers

In North America protective relays are generally referred to by standard device numbers. Letters are sometimes added to specify the application (IEEE Standard C37.2-2008).

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Industry
Jan 17, 2026

Protection and Control Device Numbers and Functions

This publication contains new and updated information as indicated in the following table. The protection and control devices in electrical equipment can be referred to by numbers, with appropriate suffix

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Industry
Dec 04, 2025

Appendix 2 ANSI/IEC Relay Symbols

To assist the Protection Engineer in converting from one system to the other, a select list of ANSI device numbers and their IEC equivalents is given in Figure A2.1.

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Industry
Jun 19, 2026

Relay Symbols & Device Numbers: IEC & IEEE Standards

Technical document detailing relay symbols, device numbers, and functions based on IEC 617 and IEEE C37.2 standards for switchgear.

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Industry
Nov 09, 2025

IEC Relay Symbols and Functions Guide | PDF | Relay | Switch

Relay Symbol - Free download as PDF File (.pdf), Text File (.txt) or read online for free. This document provides symbols and designations for relay protection devices based on IEC 617 standards.

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Industry
Apr 04, 2026

Relay Symbols: Complete List – Asutpp

This article aims to provide electricians, engineers, technicians, and curious homeowners with a helpful overview of common relay symbols, enabling clearer communication and safer electrical work.

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