F. Circuit Breakers

1. Properties and Types

Identify properties, types, and applications ^{2, 3, 4}

• Understanding High-Voltage Circuit Breaker Nameplates - Part 1
• Understanding High-Voltage Circuit Breaker Nameplates - Part 2
• GEH-6273E MicroVersaTrip Users Guide ^{2, 3}
• NEMA AB 4 Guidelines for Inspection and Preventive Maintenance of Molded-Case Circuit Breakers Used in Commercial and Industrial Applications ^{2, 3}
• The Basics of Circuit Breakers - SIEMENS Handbook
• 4 Methods of Medium-Voltage Circuit Breaker Design
• The "Why" of MV Breaker Testing
• SF₆ Circuit Breakers
• Circuit Breaker Terms and Definitions
• High Voltage Circuit Breakers: Trends and Recent Developments
• SF6 Circuit Breaker – Types, Construction, Working and Applications

2. Inspection and Test Procedures

Apply visual and mechanical inspections ^{2, 3, 4}

Important Standards

• NFPA 70B: Chapter 15 Substations and Switchgear Assemblies ^2 3 4
• NFPA 70B: Chapter 17 Insulated-Case/Molded-Case Circuit Breakers ^2 3 4

Lubrication

• 3 Critical Lubrication Points for Power Circuit Breakers
• Critical Maintenance for Circuit Breakers
• Circuit Breaker Lubrication in the Field
• Lubrication and Circuit Breakers

General Maintenance

• Circuit Breaker Maintenance
• Circuit breaker safety interlock systems explained

Employ methods and procedures for electrical tests ^{2, 3, 4}

Important Standards

• NFPA 70B: Chapter 11.10 Low-Voltage Circuit Breakers ^{2, 3, 4}
• NFPA 70B: Chapter 11.16 Medium and High Voltage Circuit Breakers ^{2, 3, 4}

Zone Interlocking

• Zone Selective Interlocking (ZSI) Basic Principles
• Reducing Fault Stress with Zone-Selective Interlocking Schneider Electric ⁴
• Zone Interlocking - EATON Application Note ³

Circuit Breaker Testing Guides

• Circuit Breaker Testing Guide - MEGGER Handbook
• 3 Basic Electrical Tests for Medium-Voltage Circuit Breakers
• 10 Critical Tests for New Power Circuit Breakers
• 5 Often Overlooked Tests for Power Circuit Breakers
• How to perform diagnostic testing of HV circuit breakers
• Recommended Circuit Breaker Tests
• Testing high speed DC circuit breakers

Vacuum Integrity

• Predicting the Remaining Life of Vacuum Interrupters in the Field
• Magnetron Atmospheric Condition (MAC) Testing Principles
• Vacuum Interrupter Testing Using Magnetron Atmospheric Condition (MAC) Test Equipment
• Vacuum Circuit Breaker Maintenance After Fault Interruption

Power Factor

• Insulation Power Factor Testing MV Indoor Circuit Breakers
• Power factor testing for circuit breakers
• Power factor testing of circuit breakers

Timing Tests

• 4 Critical Tests for Evaluating HV Circuit Breaker Performance
• Timing of Three Phase Circuit Breakers Using Digital Time Pulse Conversion

3. Interpretation of Test Results

Evaluate results of electrical tests ^{2, 3, 4}

Important Standards

• NETA-ATS 2017: Section 7.6 Circuit Breakers ^2 3 4
• NETA-MTS 2019: Section 7.6 Circuit Breakers ^2 3 4

Last Update: Feb 02, 2025