Relay protection equipment number

86T is a Lockout Relay for a Transformer. Suffixes for numbers are also suggested. In electric power systems and industrial automation, ANSI Device Numbers can be used to identify equipment and device...

Industry
May 25, 2026

ANSI device numbers

In electric power systems and industrial automation, ANSI Device Numbers can be used to identify equipment and devices in a system such as relays, circuit breakers, or instruments.

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Industry
Mar 18, 2026

Understanding the ANSI/IEEE Device Numbering System | Delgado

For protection engineers, a thorough understanding of this numbering system is essential for effective communication, proper relay configuration, and coordinated protection design.

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Industry
Mar 10, 2026

What Are ANSI Relay Numbers? The Complete C37.2 Code List

Understanding ANSI standard relay numbers is crucial for anyone involved in electrical protection and control systems. These numbers, defined by the ANSI/IEEE C37.2 standard, provide a standardized

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Industry
Jul 27, 2025

ANSI Standard Device Numbers & Common Acronyms

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

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Industry
Aug 28, 2025

ANSI Device Numbers and Acronyms

The ANSI standard device numbers ( As per ANSI/IEEE standard C37.2) are used in the design of an electrical power system. These devices protect the electrical network in the case of a

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Industry
Oct 24, 2025

ANSI (IEEE) Protective Device Numbering

Protective relays are commonly referred to by standard device numbers. For example, a time overcurrent relay is designated a 51 device, while an instantaneous overcurrent is a 50 device.

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Industry
Dec 25, 2025

Table of ANSI IEEE Standard Device Numbers

The protection and control devices in electrical equipment can be referred to by numbers, with appropriate suffix letters when necessary, according to the functions they perform.

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Industry
Mar 13, 2026

Table of ANSI IEEE Standard Device Numbers

This table details ANSI IEEE Standard Device Numbers as used for protective relaying in North America. Suffixes for numbers are also suggested.

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Industry
Aug 03, 2025

ANSI Codes

In the design of electrical power systems, the ANSI Standard Device Numbers (ANSI /IEEE Standard C37.2) denote what features a protective device supports (such as a relay or circuit breaker). These

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Industry
Jan 16, 2026

ANSI/IEEE Function Number Codes

Protective relay functions are typically represented in single-line electrical diagrams as circles, with the ANSI/IEEE number code specifying each function. This is analogous to ISA-standard loop diagrams

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Industry
Aug 31, 2025

Protection and Control Device Numbers and Functions

The protection and control devices in electrical equipment can be referred to by numbers, with appropriate suffix letters when necessary, according to the functions they perform.

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