IEEE PC37.119/D4, Jan 2016 is an approved draft guide focused on breaker failure protection for power circuit breakers. It addresses a practical protection problem in power, energy, and industrial electrical systems: how to detect when a breaker does not clear a fault as intended and how to respond consistently. IEEE PC37.119/D4, Jan 2016 is relevant to engineers who need guidance for protective relaying, system coordination, and dependable switching equipment performance.

Overview of IEEE PC37.119/D4, Jan 2016

This technical document provides guidance for breaker failure protection applied to power circuit breakers, where timely fault clearing is critical to limiting equipment damage and system disturbance. It is typically used alongside protection and control practices for substations, switchgear, and related power apparatus. IEEE PC37.119/D4, Jan 2016 helps frame the logic, application, and coordination considerations that support reliable operation when a breaker fails to interrupt current during a fault event.

Typical use cases

IEEE PC37.119/D4, Jan 2016 is typically consulted when defining breaker failure schemes for transmission and distribution substations, industrial power systems, and other installations using power circuit breakers. It is useful in relay setting reviews, protection studies, and control design for equipment that must isolate faults quickly and selectively. The guide may also support procurement and engineering decisions for systems where breaker performance, backup tripping, and coordination with adjacent protective devices are important.

Why it matters

Breaker failure protection is a key part of reducing fault duration and limiting the spread of outages, so a clear guide can improve both safety and system reliability. IEEE PC37.119/D4, Jan 2016 supports more consistent engineering decisions for compliance, testing, and design coordination in breaker-based protection schemes. For utilities and industrial operators, that can help reduce misoperation risk, improve protection selectivity, and support better control of equipment and service interruption.

• Breaker failure protection guidance
• Power circuit breaker application
• Protection and relay coordination
• Substation and switchgear context
• Fault clearing and backup tripping